PRODUCT CAPSULES Short "refreshers" on last month's ads. Obtain free information on any of the products or services described by writ­ing in the appropriate key numbers in the "Product Capsules" portion of the reply card preceding this section.

Amplifiers. Unit features no tuning, line/battery operation, simplified set-up and automatic locking circuitry. Ρ 104

Amplifiers. At 10 Hz, with a 2 Μ Ω source resistance, unit has noise figure of less than 0.3 dB. Ρ 154

Amplifiers, lock-in. Unit uses hetero­dyning, has tracking filter to eliminate tuning, phase-shift, and harmonic re­sponse problems. Ρ 92

Atomic analyzers. Unit features solid-state integrating electronics for integra­tion over selected time intervals, has high resolution monochromator.

Ρ 143

Balances. Top-loading unit has 1,000 g capacity/0.1 g accuracy with all-digi­tal readout, full-range optical scale.

Ρ 19

Balances. 20 different models of top-loading units. Catalog. Ρ 130

Balances. Top loader has 2000 g ca­pacity, 0.1 g accuracy with tare to full capacity plus 325 g. P 178

Baths. Holds 16 or more 250-ml flasks, will hold temperature from ambient to 95°C with no more than ±0.5°C varia­tion. Ρ 72

Biochemicals. Info on full line of acids, enzymes, derivatives for biochem­istry. Ρ 87

Books. Analytical Methods for Pesti­cides and Plant Growth Regulators, Vol. 6. Ρ 5

Books. Analytical Profiles of Drug Substances. Ρ 5

Books. Bioresearch Index and Bio­logical Abstracts. Ρ 1 4

Books. Determination of Organic Structures by Physical Methods. Ρ 5

Books. Infrared Spectra of Inorganic Compounds. Ρ 5

Books. Introduction to Computer Programming for Chemists. Paper-bound, ρ 2

Books. Introduction to Quantitative Experimental Chemistry. Ρ 2

Books. Practical Liquid Chromatog­raphy. Ρ 162

Books. Quantitative Analytical Chem­istry, 2nd ed. Ρ 2

Books. Relaxation in Magnetic Reso­nance. Ρ 5

Books. Spectrochemical Analysis by X-Ray Fluorescence. Ρ 162

Books. Trace Analysis by Mass Spec­trometry. Ρ 5

Calorimeters. Oxygen bomb unit mea­sures calorific or Btu value of coal, oil, other solid or liquid samples. Ρ 150

Carbon/sulfur determinators. Results displayed on electronic digital readouts as per cent carbon and sulfur. P i l l

Cathetometers. Provides 2 simultane­ous determinations of nickel, copper, lead, antimony, zinc, cadmium, other metals. Ρ 55

Cells, optical. Literature on precision glass and quartz cells. Ρ 77

Centrifuges. High-resolution GC sys­tem uses centrifugal force to reveal sample components. Brochure. Ρ 173

Chart papers. 70 standard formats, or custom-designed. Ρ 21

Chart papers. Brochure on strip chart recorder paper. Ρ 56

Chemicals, calibration. Optically pure solvents for UV, IR, NMR; many deuterated. Ρ 86

Chemicals, reagent. Catalog on ion exchange resins, anion and cation, in 44 types and bead sizes. Ρ 15

Chemicals, reagent. Info on ex­tremely high purity reagents. Ρ 88

Chemicals, reagent. Catalog classifies more than 6,000 products for over 100 key techniques and product groups.

Ρ 196

NEW METERING PUMPS from BUCHLER

MONO-STALTIC & MULTI-STALTIC pumps For A c c u r a t e Meter ing , Sampling, Layering, Transfer and Withdrawal of Liquids a t a Fixed or Variable S p e e d

Available with single, four or eight veins. Adaptable to organic solvents or corrosive liquids. Other features include: instant reversible flow; various sized tubing may be used together; individually adjustable flow rate; flow rates from 3.0 ml to 3500 ml/hr/vein; Tygon, rubber or Teflon tubing; and long tubing life without creeping or stretching. Solid state speed control.

BUCHLER INSTRUMENTS DIVISION NUCLEAR-CHICAGO CORP. , ,

A SUBSIDIARY OF G D | S E A R L E | & CO 1327 SIXTEENTH STREET, FORT LEE, NEW JERSEY, 0 7 0 2 4

Request Bulletin AC-2-6200B CIRCLE 27 ON READER SERVICE CARD

CIRCLE 32 O N READER SERVICE CARD

IT'S A FACT: You can design your own laboratory with ^ O N E N T metal laboratory furniture and still get 30 to 45 days shipment!

If you're in the market for metal laboratory furniture, our KEM-PONENT line eliminates the need to "shop around." Our prices are competitive and we offer a wide selection of base units, storage cases, aprons, fume hoods, exhaust blowers, service fixtures, etc. . . . practically everything you could possibly need, plus a Kewaunee exclusive . . . customized work tops of Kemresin, Kemrock or Kemstone.

Product Capsules

Chemicals, reagent. Catalog on diag­nostic/biomédical reagents and spe­cialty products. Ρ 197

Chemicals, reagent. Info on reagents needed to formulate solutions for auto­mated analysis. Ρ 198

Chemicals, reagent. Ready-to-use so­lutions for automated chemistries.

Ρ 199

Chemicals, reagent. High purity clin­ical lab standards. Ρ 200

Chemicals, reagent. 2 new reagents especially formulated for reduce induc­tion time in Grignard reactions. Ρ 201

Chemicals, reagent. Special low-mer­cury reagents for environmental test­ing. Ρ 202

Chemicals, reagent. Reagents for al­most all APHA tests. Ρ 203

Chemicals, reagent. GC assay sup­plied with 26 reagent grade solvents.

Ρ 204

Chemicals, reagent. Special packag­ing for solvents assures positive seal, prevents drips, vapor leakage, break­age. Ρ 205

Chemicals, reagent. uid scintillation.

Products for liq-P 2 0 6

Kewaunee Scientific Equipment Corp., 5090 S. Center St., Adrian, Michigan 49221 CIRCLE 1 H O N READER SERVICE CARD

Chemicals, reagent. More than 100 chemicals provide state-of-the-art pu­rity and analytical definition. Ρ 207

Chemicals, reagent. Biochemicals and biochemical reagents to meet NAS/ NRC specs. Ρ 208

Chemicals, reagent. Over 780 prod­ucts for separation sciences—TLC sheets, absorbents, ion exchange resins, products for electrophoresis techniques.

Ρ 209

Chemicals, solvent. New buffers come double-packaged and vacuum-sealed for longer shelf life. Ρ 110

Chemicals, solvent. New containers feature dome tops, double-seams, easy pour lip. Ρ 121

Clamps. Made of non-ferrous alloy, are heavily nickel-plated, cannot rust.

Ρ 70

Computers. Complete line of equip­ment and application software, with many variations. Ρ 48

Computers. Unit accepts unlimited number of channels of analog data over lines from remote analyzers, processes 40 channels on-line. Brochure. Ρ 95

110 A . ANALYTICAL CHEMISTRY, VOL. 44, NO. 3, MARCH 1972

CARVER !£!g5KOBY

Presses and ^ ^ ^ ^ H accessories for ^ ^ H every lab requirement ^ World's most widely used hydraul ic press for R & D , testing compounds, shear and break tests, laminat ing, pi lot runs, etc. Accessor ies include electr ical ly heated platens (150° to 650° F), channeled platens for heating or cool ing, complete test equipment. Hand operated or motor ized, quick closer and constant pressure devices available. Two sizes — 12 ton and 25 ton.

Note: Specially priced R & D press and accessory package listed in Bulletin 130.

BULLETIN 130 / 'ifk^Jl Contains illustrations, h>ltt-xli descriptions and prices / U K SSI&j of all items. / ' % H ^ * ? / '

FRED S. CARVER INC. Hydraulic Equipment Fountain Blvd., Dept. C Menomonee Falls, A Wis. 53051 *ém

A subsidiary of Sterling, Inc., Milwaukee, Wisconsin

Send for our FREE 36 page

w catalog ^

KEWAUNEE

Product Capsules

Computers, GC. Complete turnkey service for chromatography data sys­tems. Ρ 190

Conductivity meters. Differential unit monitors conductance of a single-flow­ing liquid or differences in conductance between two flowing streams. Ρ 182

Coolers. New —70°F portable cooling units. Ρ 24

Coulometers. Solid-state system in­cludes potentiostat and integrator.

Ρ 123

Cryogenic units. Details on liquid he­lium transfer and cooling system. Ρ 3

3 He/ 4

Ρ 35 Cryogenic units. Catalog on dilution refrigerator system.

Crystals, liquid. Info on full line of nematic and cholestric liquid crystals.

Ρ 140

Chromatogram analyzer. Double-beam quantitation of TLC by direct scan. Ρ 61

Chromatographs, gas. In this discrete analysis module, the injection port, col­umn and detector are handled as a single unit. Up to 4 modules may be installed together. Ρ 11

Chromatographs, gas. Two units—a 4-column multi-discipline model fea­tures on- and off-column detectors, and a compact dual-column system for routine clinical analysis. Ρ 18

Chromatographs, gas. Dual TC in­strument with isothermal oven con­troller and on-column injection port. Bulletin. Ρ 75

Chromatographs, gas. Completely modular unit has automatic oven cool­ing, sample injection, data handling. Bulletin. Ρ 76

Chromatographs, gas. Inlets, col­umns, detectors lift for rapid cool-down. 360° eye level access for quick changing of columns. Catalog. Ρ 149

Chromatographs, gas. Routine, re­search, or computer controlled analyses.

P 1 6 3

Chromatographs, gas. Multilinear temperature programmer with reten­tion time reproducibility better than 2 sec. in 19 min. P 186

Chromatographs, gas. Unit features all-glass system, on-column injection, solid-state dual/differential electrome­ter, runs up to 4 detectors and 4 U-col-umns simultaneously. Ρ 187

Looking for an integrated GC/MS system with a high standard of performance? Gnom has 16,000 miles of proof.

The MAT 111 " G n o m " went from the production line onto a van. Then it toured the U.S. and Canada. In temperatures f rom below freezing to 95°F. Analyzing 800 samples wi thout a malfunction — delivering good, usable spectra every time.

And the compact MAT 111 has more than reliable performance going for it. It's integrated—using a Varian gas chromatograph and mass spectrometer, both designed especially for CC/MS, with the magnetic sector MS giving you constant resolution and sensitivity throughout the entire 1-1000 mass range (linear or exponential). It's not just a CC hooked onto any mass spectrometer.

Wi th both GC and MS made by Varian, you get single-source responsibility for the entire instrument (including data system if you want one).

But the most amazing thing is operating the MAT 111 for yourself and seeing how easy it is to get outstanding results. You can see it at our laboratories or at one of the GC/MS seminars planned this coming year.

For more information or an appointment to see the MAT 111, phone our Product Manager, Helmut Raddatz at 415-326-4000, Ext. 3045. Or write to him at: Varian MAT, 611 Hansen Way, Palo Al to, California 94303. He'll also see that you get a schedule of forthcoming seminars.

varian mat CIRCLE 1 9 0 O N READER SERVICE CARD

ANALYTICAL CHEMISTRY, VOL. 44, NO. 3, MARCH 1972 . I l l A

GAS WASHING BOTTLE

Unbreakable graduated 250 cc polypro­pylene bottle with tip-proof round base. Top is leakproof screw cap with VA" O.D. polyethylene tubes for entrance into gas dispersion chamber and exit for washed gas. Gas is dispersed through porous polyethylene dispersion tube with an average pore size of 35 microns. This is an application of our micro-por­ous polyethylene which is available in a complete line of filtering apparatus in­cluding funnels, extraction thimbles, crucibles, tubes, immersion f i l ters, discs, sheets, etc.

GAS SAMPLING TUBES

Unbreakable polyethylene gas sampling tubes with polyethylene stopcocks at each end . . . in two sizes 125 cc and 250 cc. Stopcocks have 3 mm bore and accept VA" I.D. tubing. Now available with septum.

GAS GENERATING FLASK Excellent unbreakable flask for student and laboratory use in gener­at ing gases such as hydrogen and carbon dioxide. Flask and this­tle top are of polypro­pylene. Tube of poly­ethylene. VIKEM" Stop­per is of flexible vinyl. Flask has capacity of 500ml; tubes VA" O.D.

See your nearest laboratory supply dealer.

Send for our NEW 88 page catalog 723. For your FREE copy write Dept. A-3

BEL-ART PRODUCTS PEQUANNOCK, N. J. 07440

CIRCLE 25 O N READER SERVICE CARD

Product Capsules

Chromatographs, liquid. New high pressure unit with modular equipment.

Ρ 40

Chromatographs, liquid. Dial in any flow rate up to 200 ml/hour, up to 5000 psi, regardless of viscosity changes.

Ρ 188

Chromatographs, liquid. Low-cost, simple, functional, easy-to-use unit. Modular design enables user to upgrade easily. Ρ 189

Chromatographs, thin layer. Two styles for quantitative control of sam­ple streaking for TLC, preparative layer, and paper chromatography. Bulletin. Ρ 170

Chromatographs, TL. Catalog fea­tures TLC and electrophoresis instru­ments and supplies. Ρ 34

Chromatographs, TLC. 32-page book on properties, applications, bibliogra­phy. Ρ 65

Chromatography accessories. Sup­ports, adsorbents, applicators, other products for gas, liquid, TLC. Ρ 4

Chromatography accessories. 48-page catalog on GC supplies and ac­cessories. Ρ 39 Chromatography accessories. Pre-coated plates for TLC and other prod­ucts for chromatography. Ρ 85

Chromatography gels. 2 new groups of controlled-pore-size materials : silica gel and polyvinylacetate. Ρ 145

Densitometers. Complete systems from simple analog conversion to com­plete computer-controlled systems.

Ρ 98

Dessicants. Dries air and gases to terminal dryness of 0.005 mg per liter of gas. Ρ 84

Detectors, GC. Two units—from low-cost which provides automatic sampling and designed-in compatability to ad­vanced model permitting choice from 13 separate systems. Ρ 176

Diffractometers. Analyzes up to 35 samples automatically, has computer­ized data handling system. Ρ 147

Electro balances. Two new ultrasensi­tive, variable temperature, magnetic susceptibility systems, operating in air or vacuum. Ρ 41

Electrometers. Vibrating rccd unit de­tects currents of 10~17 ampere, charges as small as 5 X 10-16 coulomb. Ρ 29

Evaporators. Bulletin on unit for si­multaneous concentrations or evapora­tion of 10 samples in 10-20 minutes.

Ρ 59

Evaporators. Rotary vacuum unit has high torque motor, 30-350 rpm range, stepless speed control. Bulletin. Ρ 161

Filters. New equilibrium dialysis sys­tem speeds up handling and determina­tion of binding parameters. Ρ 115

Flowmeters. Easy-to-operate units provide easy flow rate determination of hydrogen, nitrogen, helium, or air.

Ρ 166

Fraction collectors. Two compact units provide drop, time, and volume methods of collection. Bulletin. Ρ 60

Gases. Helium gas for use with chro­matographic separations. Ρ 16

GC/MS system. Links mass spectrom­eter and computer for data acquisition and analysis. 3 models. Ρ 9

Hot plates. New unit has fast heatup, operating temperatures to 371°C, ac­curate temperature control. Catalog.

Ρ 177

Integrators. Electronic digital unit suitable for GC, standard, and high speed liquid chromatography. Catalog.

Ρ 93

Integrators. New system brings full automation to any gas or liquid chro-matograph, handles up to 4 chromato­graphs simultaneously. Ρ 119

Integrators. Unit can resolve laser-simulated pulses in as short as 10 nano­seconds. Ρ 153

Ion exchangers. Five different car­tridges for water purity, in 2 sizes, meet need for varying levels of purity. Bro­chure. Ρ 91

Ion papers. New indicators in strip form for metal ions. Ρ 146

Lasers. New drop-in dye cassettes or static dye cells give tunable laser specs.

Ρ 90

Lamps, hollow cathode. Wide variety to fit any AA spectrophotometer. Ρ 22

Lattices. Adjustable frameworks for apparatus assembly. Standard sets make up to racks measuring 2' X 2', 2' X 4', 4' X 4', 4' X 6'. Ρ 71

112 A · ANALYTICAL CHEMISTRY, VOL. 44, NO. 3, MARCH 1972 >

BELr-A- iFtT

• GAS WASHING • GAS SAMPLING

• GAS GENERATING

Product Capsu les

Lubricants. Bulletin on greases to stop glassware leakage. Ρ 23

Mercury analyzers. Complete, self-contained, low-cost system makes mer­cury determination an inexpensive rou­tine procedure. Sensitivity .01 μg of mercury. Bulletin. Ρ 37

Ovens. Dual thermostatic system re­sponds to ±0.5° change in the chamber. Wall and bench models. Ρ 69

Ovens. 35 models from 0.3 to 25.4 cu. ft. Bulletin. Ρ 158

pH meters. 12 models—analog to digi­tal, and portable to expanded-scale re­search, all guaranteed for 2 years. Ρ 31

pH meters. New digital-display models from advanced 4 and 5-digit meters to conventional analog display models. Ρ 68

ρ Η meters. All-purpose digital meter for pH and specific ion potentiometry.

Ρ 171

pH papers. Indicators covalently bound to cellulose, are colorfast. Free sample. Ρ 89

Photon/ion counters. Systems start from quantum sensors and terminate at any desired single or multiple data re­cording interface. Ρ 174

Pipets. Dispenser unit available in low-silhouette version in 1, 5, 10, 20, 50 ml with 1% accuracy, 0.1% reproduci­bility. P108

Polarographic analyzers. Detect trace metals in water, as well as organics, in­organics, pharmaceuticals. Ρ 160

Pumps. Detailed bulletins on self-priming peristaltic, sealless, and chemi­cally intert continuous-duty pumps.

Ρ 124

Reagents. Over 10,000 organics, acids, inorganics, solvents, solutions, dyes in new catalog. Ρ 73

Reagents, diagnostic. Expanding line of reagent sets for clinical determina­tions. Ρ 142

Recorders. Stop, record, digitize, and display even non-repetitive wave forms.

Ρ 13

Recorders. Digital readout of pH and millivolts with 3V2 digit nixie tube dis­play. " Ρ 30

Recorders. Fast response, single or 2 pen crossover recorders. Catalog. Ρ 58

Let ISCO high t i : pressure you

ί 4ψ9~"

ISCO instruments for high pressure l iqu id chromatography give you high speed separation at low speed cost. Meter­ing and gradient pumps operate at 2000 psi with single stroke piston construction to eliminate pulsation and dissolved gas; stainless steel columns have non-clogging supports and fittings with no dead volume or mixing. Effluent is monitored by a dual beam, high sensitivity UV photometer with seven absorbance ranges from 0.02 A to 2.0 A full scale, and instant wavelength selection of 254 nm, 280 nm or other wavelengths to 950 nm. The whole chromatograph as pictured —pump, col­umn (unpacked), photometer, recorder, sample injection valve, and degasser, with gauge and other hardware, costs under $3,450. Plug your present recorder into the photometer and save $750; or add less than $2500 more to include a fraction col-ector and electronic digital integrator

with fully automatic com­pensation for peak shape

and baseline drift. Many additional features and options are available, all described in our current catalog. Send for your copy now.

INSTRUMENTATION SPECIALTIES COMPANY 4700 SUPERIOR · LINCOLN, NEBRASKA 68504 ·

CIRCLE 95 O N READER SERVICE CARD

PHONE (402) 434-0231

You get better results when you see things our way

The new Luminon spectrophotometer cells feature fully fused quartz or glass seams. . no low melting intermediate cements to cause problems. This also insures that the cells are impervious to cleaning x"1' solutions and other deteriorating media, i

Luminon produces a complete line of cells for U.V., far U.V., near U.V., visible light and near I.R. And, if needed, we can produce customized cells to your specifications

For information on our complete line of low priced cells, write today.

ti)

122Coit Street, Irvington, N. J. 07111 · 201 -373-4242 Associated fwith International Crystal Laboratories

CIRCLE 123 O N READER SERVICE CARD

ANALYTICAL CHEMISTRY, VOL. 44, NO. 3, MARCH 1972 . 113 A

LUMINON, INC.

Cary 401. The Cary 401 Vibrating Reed Electrometer, the most accurate in the wor ld , detects currents of 10"17

ampere, charges as small as 5 χ 10"16

coulomb, and potentials down to 2 χ 10 - 5 volt f rom high impedance sources. Its standard features include solid state circuitry, mul t ip le resistor input switching, remote input shorting, 1-second critically damped response t ime, and measurement of potentials f rom grounded sources.

Modi f ied versions offer critically damped response times of 0.5 and 2 seconds, and range changing can be computer control led.

So, if your application is in mass spectrometry, radioactivity, physical measurement or biomedical research, the Cary 401 can tackle just about any problem you've got to solve.

For more information on the top vibrating reed electrometer commercial ly available, wr i te Cary Instruments, a Varian subsidiary, 2724 S. Peck Road, Monrovia, California 91016. Ask for data fi le P203-22.

Still the most sensitive, stable, and reliable electrometer on this planet.

cary instruments

CIRCLE 41 O N READER SERVICE CARD

Product Capsules

Recorders. Modular flexibility pro­vided by basic plug-in, sensitivity plug-in, and pH interface modules.

Ρ 112

Recorders. Strip-chart unit has 12 speeds plus six input ranges from 1 mv. Accuracy is ±.025%, reproducibility is better than 0.1%. Ρ 113

Recorders. X-Y portable units with sealed follow-up potentiometers buff­ered for noise immunity. Ρ 135

Recorders. Combination readout-con­verter-printout unit with linear/+log/ —log response. Ρ 179

Recorders, plug-in. Details on 5-inch and 10-inch units with 1 to 100 milli­volt sensitivity. Ρ 78

Samplers, flameless. Simple-to-oper-ate systems for trace analysis determi­nations in AA spectroscopy. Ρ 94

Signal analyzers. Four plug-ins for averaging ultrafast transients, counting pulses from 4 sources, averaging with respect to non-linear independent vari­ables. Ρ 138

Solvents. Data sheet on chemicals dis­tilled in glass. Ρ 26

Spectra. IR spectra of up to 90 peaks in a single chromatographic run. Ρ 49

Spectra services. High resolution mass spectra data at low cost. Ρ 172

Spectrochemical standards. More than 60 standards with compositions designed to encompass Federal specs.

P I

Spectrometer accessories. Info on optical niters available with computer-synthesized coatings. Ρ 45

Spectrometer accessories. Photo de­tectors for filter photometry. Ρ 46

Spectrometer accessories. Candle-flame burners—pre-mix or total con­sumption. Ρ 47

Spectrophotometer accessories. Lit­erature on IR windows, pressed pellet powders and dies, mull plates and hold­ers. Ρ 83

Spectrometers, ESCA. Source can ac­commodate up to 7 inlet systems, cooled and heat probes (—150°C to +400°C). Ρ 10

Spectrometers, fluorescence. Single-photo counting technique applied to field of nanosecond fluorescence spec­troscopy. Data sheet. Ρ 144

Spectrometers, ion scattering. N e w surface analysis technique enables unit to detect and identify elements present and pinpoint their precise locations within underlying monolayers. Ρ 127

Spectrometers, IR. Unit provides scan from 2.5/x to 15μ in 6 seconds. IR peak identifier readily coupled to all gas chromatographs through heat transfer lines. Ρ 143

Spectrometers, IR. All essential com­ponents (except detector, preamplifier) mounted in a 6" Χ 6" Χ 10" box less than 12 pounds in weight. Ρ 181

Spectrometers, mass. Resolution over 100,000 (10% valley), with wide range of available accessories. Ρ 6

Spectrometers, mass. Detects less than 0.5 ppb with all elements detected in single analysis. Ρ 7

Spectrometers, mass. New, compact, low-cost unit designed for biologist for accurate determination of isotope abundance ratios in gases. Ρ 8

Spectrometers, mass. 60° sector, magnetically scanned unit with multi­purpose inlet. Budget priced. Ρ 184

Spectrometers, N M R . U n i t converts c-w system to Fourier transform. Ρ 43

Spectrometers, NMR. 100 MHz pro­ton desk top unit with int/ext lock, spin decoupler, variable temperature regulation from -70°C to +170°C.

Ρ 9 7

Spectrometers, NMR. Model operates at 60 HMz to provide data in a form directly comparable to most published NMR reference spectra. Ρ 157

Spectrometers, NMR. Units have Fourier transform accessories for struc­tural and conformational studies.

Ρ 1 8 3

Spectrometers, NMR. Built-in inte­grator permits quantitative analysis, provides calibrated spectra which can be referenced to any particular peak.

Ρ 1 8 5

Spectrometers, photoelectron. Large sample chamber accepts odd-shaped samples or an S-position multisample holder. Catalog. Ρ 126

1 1 4 A · ANALYTICAL CHEMISTRY, VOL. . 4 4 , NO. 3, MARCH 1972

New! General Electric announces a simple, reliable hydrogen generator for gas chromatographs • eliminates gas bottle

storage and use problems • makes equipment portable • uses no caustic solutions

Whether you're a manufac­turer of gas chromatographs and f lame ionization detectors, or a laboratory man w h o uses such equipment, you'l l be interested in th is n e w GE hydrogen generator — a technological descendant of the Gemini p rogram fuel cell.

It's compact — less than a cubic f o o t — a n d weighs only 2 6 pounds.

It's simple — needs no palladium dif fuser t o contro l pur i ty, and maintenance requirements are minimal. A d d only disti l led water , and replace the desiccant cart r idge occasionally.

It's reliable — long life is inherent in its solid polymer electrolyte. SPECIFICATIONS Size: 12x10x11" Weight: 26 lbs. Hydrogen Flow Rate: 0 to 1 50

cc/min. STP Delivery Pressure: 2 to 60 psig Pressure Control: 0.5% For more informat ion, wr i te : Direct Energy Conversion

Programs General Electric Company 9 3 0 Western A v e n u e Lynn, Massachusetts 0 1 9 1 0

AIRCRAFT EQUIPMENT DIVISION

G E N E R A L E L E C T R I C 183-01

Product Capsules

Spectrometers, UV/VIS. Modular photometric system provides light sources, sample holders, and detectors. Solid-state. Catalog. Ρ 122

Spectrometers, x-ray. Info on over 1,000 different systems for x-ray energy spectrometry. Ρ 102

Spectrometers, x-ray. Simultaneous energy dispersive analysis of all ele­ments from fluorine through uranium.

Ρ 139

Spectrophotometers, AA. Modular unit for exacting research needs or routine bulk analyses. Ρ 191

Spectrophotometers, IR. Line of automated instruments for forensic chemistry. Ρ 155

Spectrophotometers, IR. Unit has ca­pability to far infared, has wide-range automatic gain and slit control systems.

Ρ 156

Spectrophotometers, IR. Total re­flectance double-beam unit. Ρ 195

Spectrophotometers, Raman. Simple-to-operate unit can handle all aqueous samples, has wavenumber range of from near 0 to 4000 Δ cm~ Ρ 27

Spectrophotometers, UV/VIS. Fea­tures include double monochromator, digitally coupled wavelength scan and chart drive, photometric accuracy of 0.001 at 1 absorbance. Brochure.

Ρ 28

Spectrophotometers, UV/VIS. Spec­tral bandpass of 2 ταμ which is constant throughout range of 200 to 900 ταμ with wavelength accuracy better than 0.5 ταμ. Ρ 36

Spectrophotometers, UV/VIS. Ratio-recording unit with better than 0.1 nm resolution, better than 0.001 A baseline flatness, better than 0.001 A photo­metric precision. Ρ 81

Spectrophotometers, UV/VIS. 2 new units (one a meter readout, the other digital) feature simplicity, versatility, solid-state electronics. Ρ 193

Spectroscopic supplies. Catalogs on supplies for pH, TJV, IR, nuclear, GC, AA, and recording instrumentation.

Ρ 20

Spectroscopy, Auger. Unit routinely determines in-depth composition pro­files with depth resolution of 10 A and sensitivity of 0.1 atomic per cent.

Ρ 148

light box or stirrer ...or both!

TYPE 7200 STIR-LIGHT

2 IN 1 UTILITY

Equally good as a light box or a magnetic stirrer, Stir-Light combines the best features of both uses to promote accurate and speedy titrations, slide work or visual in­spections.

POWERFUL STIRRING CONTROL

Alnico magnets can stir up to 5,000 centi-poises with either churning or slow and gentle actions.

STEPLESS STIRRING CONTROL

60 to 1500 rpm for optimum stirring.

PRACTICAL SIZE

7" χ 7 " top promotes accuracy and elimin­ates eye strain.

ATTRACTIVE

Strong, perforated stainless steel case keeps top, motor and controls cool. Supports heavy loads; has dovetail for apparatus mount.

Model SL-7225_ _$75.00 (Price w i t h 2 st i r r ing bars)

Write τοχ yLSSL Catalog

THERMOLYNE SYBRON CORPORATION

2 5 5 5 K E R P E R B O U L E V A R D , D U B U Q U E . I O W A 5 2 0 0 1

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A N A L Y T I C A L C H E M I S T R Y ,

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V O L . 4 4 , N O . 3 , M A R C H 1 9 7 2 · 1 1 5 A

Product Capsules Sulfur analyzers. Direct-reading bu­rette reveals sulfur content within 3 minutes. Ρ 42

Supports, GC. Bulletin on 5 grades of polymer supports. Ρ 99

Surface area analyzers. Completely automated unit analyzes up to 5 sam­ples simultaneously. Ρ 131

Syringes. Microliter unit delivers sample to ± 1 % . Ρ 82

Supply house. Single source for lab equipment, supplies, and scientific in­struments. Ρ 175

Temperature instruments. Catalog on thermistor probes and instruments.

P211

Thermal analyzers. System can be hooked up with computers, teleprinter, has flame ionization detection capabil­ity. Ρ 44

Thermal analyzers. Matched systems with add-on accessories covering tem­perature range of -150°C to 1600°C.

Ρ 52

Thermal analyzers. Complete line of DTA, HP-DTA, and control console units. Ρ 180

Titration standards. For acid-base titration, buffer solutions, AA stan­dards. Brochure. Ρ141

Titrators. Handles wide range of ma­terials. Sampling systems available for all types of materials. Ρ 50

Titrators. 3-unit instrument is com­pletely modular, has interchangeable burettes, all-electronic connections to modules. Catalog. Ρ 133

Titrators. Automatic Karl Fischer unit with digital readout. Ρ 159

Tools. Keeps threads smooth and free running, supplied in 4 die sizes. Ρ 152

Towels. Higlily absorbent, lint-free, for drying wet film, other cleaning and polishing jobs. Ρ 169

Tubes, photomultiplier. Complete line of head-on units with maximum size choice, photocathode, spectral response from 1600-8500 À. P 80

Vacuum etcher. orientation, can microscopy.

Examine grain size or be used in electron

Ρ 25

Valves. Micro- and mini-volume GC valves feature sandwich-styled sealing.

Ρ 38

Ware, glass. 1000 ml beaker with stronger rim, modified flare, ± 5 % ap­proximate graduations. Ρ 32

Ware, glass. New wide mouth flash evaporator glassware with four differ­ent "O" rings available. Ρ 66

Ware, plastic. Squeeze bottles with single-mold cap-and-nozzle unit—avail­able in 30, 60, 125, 250, 500, and 1,000 ml sizes. Ρ 125

Ware, plastic. Separatory Teflon fun­nels available in 125, 250, 500 ml sizes. Catalog. Ρ 137

Water analyzers. Manometric BOD measurements compare within ± 5 % of standard APHA dilution procedures.

Ρ 79

Water analyzers. Chemical oxygen de­termination to ± 3 % or better on water quality. Uses carbon dioxide. Ρ 151

X-ray analyzers. Complete line includ­ing 25-lb. battery-operated portable unit, fixed program industrial units, and flexible program units linked directly or via magnetic tape. Ρ 96

X-ray equipment. Wide range of equipment including basic generators, diffractometers, attachments, computer-controlled systems, other specialty items. Ρ 1 6 7

LABORATORY SUPPLY CENTER

.£>«^ra«3?W SHIFT REAGENTS FOR NMR? $10/gram; $45/5x1 gram For lowest prices, call (415) 234-4130

BIO-RAD Laboratories 32nd & Griffin Ave., Richmond, CA 94804 |

now even better for Fluoride

AMADAC-F Convenience'packaged mixture of lanthanum chelate of 3-aminomethylalizarin-NN-diacetic acid, buffers and stabilizers, affords accurate, sensitive and convenient quantitative colori-metric method for fluoride. 50 g. (for 100 detns.), with bibliography and complete instructions $15

CABLE ADDRESS. SACTEX PROMPT SHIPMENT

TETRABUTYLAMMONIUM COMPOUNDS Bromide - Chloride - Fluoborate - Hydroxide

Iodide - Perchlorate Solid Liquid Crystalline Non-aqueous

Polarographic Aqueous Anhydrous Methanolic

SOUTHWESTERN ANALYTICAL CHEMICALS BOX 4B5 ~ AUST,N- rEX

V » H t / V \ l \ » A L D AREA 512 444-3626 BOX 485 — AUSTIN, TEX AREA 512 4 4 4 - 3 6 2 6

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p-Acetylaminobenzaldehyde · Ammonium Reineckale · Azobenzene Bromocresol Purple · e-Caprolactone · Cellobiose · a-Chloralose

1,2-Diethoxyethane · Diethyladipate · Dimethylamine HCI · Esculin Hippuric, Hydrocinnamic, a-Kefoglutaric and Malonic Acids

Maltose · Mandelic Acid · Methylacetamide · Methyl Butyrate Methyl-p-toluene Sulfonate · l-Nitroso-2-naphthol · Orcinol

Phenol Red & Sodium · Potassium Rhodizonate · Protocatechuic Acid Salicin · Succinimide · 2,2,2-Tribromoethanol · Uracil · Xylose

Tel: 291696-1709* Write for list K-72 of other chemicals

TWX: 719 988-5831

EASTERN CHEMICAL CORPORATION Zip Code 97440

PEQUANNOCK, N. J.

RAMAN SPECTRA may reveal unsuspected molecular structure or confirm your guess about infrared scans.

Our Commercial Raman Service Lab­oratory runs spectra on an individual sample basis.

Write or phone (201) 549-7144

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|Γ INDUSTRIES, INC

METUCHEN, N.J. 08840

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