ΓΑ FAST, EFFICIENT ALTERNATIVE TO KJELDAHL.

The Microprocessor Controlled MODEL 707 Provides Nitrogen/ Protein Analysis... In as Little as 30 Seconds!

• Uses proven chemilumi-nescent detection principle

• Microprocessor controlled for greater stability and repeatability

• Programmed temperature parameters

• Handles from 5 to 120 samples per hour

MODEL 707 • Accomodates up to 1g

sample size • 1 nanogram sensitivity

with dynamic range of 106

• Extended range accessory (Model 732) allows combined nitrogen in percentage range

A N T E K ® I N S T R U M E N T S , I N C . 6005 North Freeway Houston, Texas 77076 TELEPHONE (713) 691-2265

~>%g£gZ* THE NEWEST OF THE

NEW «iplele UP ΓΟ DATE REFFRENCb on 11.·

PERCHLORIC ΑΟΓ) AND PERCHLORA1ES

A n o t h e r O u t s t a n d i n g P u b l i c a t i o n f r o m

G.FREDERICK S M I T H CHEMICAL COMPANY

TWX: 910-881-1792

CIRCLE 7 ON READER SERVICE CARD

Tailor Made Monochromator

TAILOR-MADE MONOCHROMATOR lor your experimental requirements, a flexible 0.2m Vacuum Monochromator

spectral scanning of IJV lase' and fluoicsccnce emission disocsion of iyocf>'Olr<jn radiation dtiso'ption and emission spcclioscopy calibration ol ilfileclors and films iiinaljle UV radiation sources

Vacuum UV UV VIS IR operat ion ( i r om below 300A)

Aberration -corrected concave holographic grat ing, kmematical ly moun led

Fabricated housing UHV model available

Fast optical sys lem F / 4.5 nominal

Wavelength-optimized optics Interchangeable diverter mirrors may be coated as individual reflective filters (e.g. for VUV-UV laser lines at 1460, 1720, 1930, 2484, 3080, or 3511 A) for high peak efficiency and low out-Of-band reflectance; kinematic mounts allow quick replacement without realignment. Standard broad-spectrum Ai-MgF2 coatings allow efficient operation above 1150A, with 80% typical reflectance at 1216A. Extreme UV coatings of Osmium are supplied for short-wavelength operation. Compatible ARC accessories: Light Sources. Power Supplies, . Diffusion Pumping System, Sample Chambers, Detector Assemblies. Model 50 Filter Assembly.

ACTON RESEARCH CORPORATION BOX !15·525ΜΑΙΝ ST RE ET· ACTON. MASSACHUSF Γ

(617J263 3M4«TELEX 94 0787 AHC ACTO IN EUROPE. CONTACT ORIEL

PRECIS ION OPTICAL I N S T R U M E N T S C O M P O N E N T S A N D C O A T I N G S

Y O U R M O S T

DIRECT SOURCE FOR T H E F I N E S T C O M M E R C I A L L Y

A V A I L A B L E

BUY DIRECT in ANY

QUANTITY FROM THE

MANUFACTURER

"Analyt ical Chemicals Since 1928"

G. FREDERICK S M I T H CHEMICAL COMPANY

867 McKinley Ave « i ' ! S 2 2 ' r ' a l a · Columbus.Ohio 43223 B l 4 224-5343

s or circle

ά&?

...it's FREE

CIRCLE 2 ON READER SERVICE CARD CIRCLE 189 ON READER SERVICE CARD

1 0 0 8 A · A N A L Y T I C A L C H E M I S T R Y , V O L . 5 1 , N O . 9 , A U G U S T 1 9 7 9