Choosing the “Correct” GC Column Dimensions and Stationary ...
the EDITOR'S column
2
the EDITOR'S column L.T. Hallett, Editor ¥ Ν THE LABORATORY OF THE MONTH article on Shell International Re- search's new fundamental research laboratory at Birlinghoven Castle in West Germany which appeared in the July 1964 issue of ANALYTICAL CHEMISTRY (page 93 A) it was re- ported that Shell had developed an automatic instrument for the deter- mination of carbon, hydrogen, and nitrogen. Because of the wide- spread interest in this development, Shell International Research has supplied us with the following ad- ditional information: The process of the explosion-like combustion in helium with only 2-3% oxygen as well as the separa- tion and quantitative determination of the combustion gases were devel- oped by W. Walisch [Chem. Ber. 94, 2314 (1961)]. Shell Interna- tional Research has subsequently further automatized this method, so that the percentages of carbon, hy- drogen, and nitrogen are printed out within 8 minutes. The only manipulations to be carried out are : (1) Weighing in of 0.3-1 mg. sam- ples. (2) Introduction of the combustion boat into the combustion tube. (3) Adjustment of a digidial to the numerical value of the weighing. (4) Pressing of a button to start the combustion cycle. The entire electronic equipment for the integration of peak areas and conversion into percentage composition can be assembled from commercially available compo- nents. The design of this appara- tus was described in detail by Horst Weitkamp and Friedhelm Korte [Chemie-Ingenieur-Technik 35, 429 (1963)]. Since then, a few changes were found desirable in order to analyze for substances which either are resistant to combustion or are WELCH @ © VACUUM PUMPS HIGH VACUUM HIGH QUALITY HIGH CAPACITY NO INSTALLATION No need to bolt down the base of the Welch "Duo-Seal" No. 1402B. Like all Welch Vacuum Pumps, just place it on a firm, flat surface and plug it in. The pump is so quiet and vibration-free that it STAYS PUT. Gliech. tUe.i& jj&cUu-ieA.: • Low ultimate pressure — 1 Χ 1 0 -4 mm Hg (torr) • High pumping speed — 140 liters/minute • Vented exhaust—no need for oil filters or separators • Compact, rugged design — 19- 5 A" X 11-7's* X 15-V 2 " high • Air-cooled . . . low maintenance • Long, trouble-free life 7306 N. Linder Ave., Skokie, III. 60076 840 Cherry St., San Carlos, Calif. 94070 · PAT. NO. 2,337,849 Welch vacuum pumps cover a wide range from 21 to 8,400 liters per minute and ultimates from 2 X 10~ 2 mm Hg (torr) to 1 X 10~ 9 mm Hg (torr) or better. SEND FOR THE NEW CONDENSED "DUO- SEAL" CATALOG TODAY! it contains photos de- scriptions, performance curves, dimensions and prices of all pumps. THE WELCH SCIENTIFIC COMPANY • 331 Ε. 38th St., New York, Ν. Υ. 10016 13428 Wyandotte, North Hollywood, Calif. 91605 A NEW FLEXIBLE LOW-COST MODEL 160 SERIES DUAL COLUMN PROGRAMMED GAS CHROMATOGRAPHS A new concept of high performance and convenience in operation — plus great flexibility — a wide selection of rise rates and faster blow-down — all at a new low cost — distinguish the new Model 160 Series built around a new basic column oven design. An entirely new automatic prepara- tion gas chromatograph is included in the series which has 3 distinct models and 4 additional combina- tions of optional equipment. The out- standing features of each represent a valuable contribution to the art and science of gas chromatography. 35.00. To properly appraise the application values of this new series write for Model 1 60 Data Sheet. 2092 Ν. LINCOLN AVE. / ALTADENA, CALIF. / 794-1167 (AC 213) Circle No. 11 on Readers' Service Card VOL. 36, NO. 11, OCTOBER 1964 · 9 1 A LOENCO inc. ^?^ο^αβ^^$^£Λίΐ^£^ζά^^ΐ,ί2^β^ίσ&
Transcript of the EDITOR'S column
the EDITOR'S
column L.T. Ha l le t t , Ed i to r
¥ Ν T H E LABORATORY OF T H E M O N T H
article on Shell In ternat ional Research's new fundamental research laboratory a t Birlinghoven Castle in West Germany which appeared in the July 1964 issue of ANALYTICAL CHEMISTRY (page 93 A) it was reported t ha t Shell had developed an automatic instrument for the determination of carbon, hydrogen, and nitrogen. Because of the widespread interest in this development, Shell In ternat ional Research has supplied us with the following additional information:
The process of the explosion-like combustion in helium with only 2 - 3 % oxygen as well as the separation and quant i ta t ive determination of the combustion gases were developed by W. Walisch [Chem. Ber. 94, 2314 (1961)] . Shell In te rnational Research has subsequently further automatized this method, so t h a t the percentages of carbon, hydrogen, and nitrogen are printed out within 8 minutes.
The only manipulat ions to be carried out are :
(1) Weighing in of 0.3-1 mg. samples. (2) Introduction of the combustion boat into the combustion tube. (3) Adjustment of a digidial to the numerical value of the weighing. (4) Pressing of a but ton to s ta r t the combustion cycle.
The entire electronic equipment for the integration of peak areas and conversion into percentage composition can be assembled from commercially available components. The design of this apparatus was described in detail by Hors t Wei tkamp and Friedhelm Korte [Chemie-Ingenieur-Technik 35, 429 (1963)]. Since then, a few changes were found desirable in order to analyze for substances which either are resistant to combustion or are
WELCH @ © VACUUM PUMPS HIGH V A C U U M HIGH QUALITY HIGH CAPACITY N O INSTALLATION
No need to bolt down the base of the Welch "Duo-Seal" No. 1402B. Like all Welch Vacuum Pumps, just place it on a firm, flat surface and plug it in. The pump is so quiet and vibration-free that it STAYS PUT.
Gliech. tUe.i& jj&cUu-ieA.:
• Low ultimate pressure — 1 Χ 1 0 - 4 mm Hg (torr)
• High pumping speed — 140 liters/minute
• Vented exhaust—no need for oil filters or separators
• Compact, rugged design — 19- 5A" X 11-7's* X 15-V 2 " high
• Air -cooled . . . l ow maintenance • Long, trouble-free life
7306 N. Linder Ave., Skokie, III. 60076 840 Cherry St., San Carlos, Calif. 94070 ·
PAT. NO. 2,337,849
Welch vacuum pumps cover a wide range from 21 to 8,400 liters per minute and ultimates from 2 X 10~ 2
mm Hg (torr) to 1 X 10~ 9 mm Hg (torr) or better.
SEND FOR THE NEW CONDENSED "DUO-SEAL" CATALOG TODAY!
it contains photos d e scriptions, performance curves, dimensions and prices of all pumps.
THE WELCH SCIENTIFIC COMPANY
• 331 Ε. 38th St., New York, Ν. Υ. 10016 13428 Wyandotte, North Hollywood, Calif. 91605
A NEW FLEXIBLE LOW-COST MODEL 160 SERIES
DUAL COLUMN PROGRAMMED GAS CHROMATOGRAPHS A new concep t of high per fo rmance and convenience in operat ion — plus great f lexibi l i ty — a w ide select ion of rise rates and fas ter b low-down — all a t a new low cost — dist inguish the new Model 160 Series bui l t around a new basic co lumn oven design. A n entirely new automat ic preparat ion gas chromatograph is included in the series wh ich has 3 d is t inct m o d e l s a n d 4 a d d i t i o n a l c o m b i n a t ions o f opt ional equipment . The outs tand ing fea tu res o f each represent a valuable contr ibut ion t o the ar t and science of gas chromatography . 35 .00 . T o properly appraise the application
values of this n e w series wr i te for Model 1 6 0 Data Sheet .
2 0 9 2 Ν. L I N C O L N A V E . / A L T A D E N A , C A L I F . / 7 9 4 - 1 1 6 7 (AC 2 1 3 )
Circle No. 11 on Readers' Service Card
VOL. 36, NO. 11, OCTOBER 1964 · 9 1 A
LOENCO inc. ^?^ο^αβ^^$^£Λίΐ^£^ζά^^ΐ,ί2^β^ίσ&
EDITOR'S COLUMN
part ia l ly incombustible (i.e., leave a residue). These modifications were reported recently by Hors t Weit -kamp, Richard Mayntz , and Fried-helm Korte [Z. Anal. Chem. 205, 81 (1964)] along with the techniques for the analyses of a great var ie ty of compounds.
The appara tus is not available commercially.
CALIBRATION OF GERMANIUM RESISTANCE THERMOMETERS
The Nat ional Bureau of Standards Inst i tute for Basic Standards is now accepting germanium resistance thermometers for calibration over the range 2° to 5° K. Germanium resistors submitted for this sendee will be compared with N B S germanium resistance thermometers of high sensitivity t ha t have been calibrated with reference to the 1958 He 4 scale of temperatures . [NBS Monograph 10 (1960). For sale by the Superintendent of Documents, U. S. Government Print ing Office, Washington, D . C. 20402. Price 20 cents.]
ADDENDUM TO THE APRIL 1964 REPORT FOR ANALYTICAL CHEMISTS
The following addendum to "The Role of the Electroanalyt ical Chemist in Biochemical Research," which appeared as a Repor t for Analytical Chemists [ANAL. C H E M . 36, No. 4, 29 A (1964)] has been submit ted:
The original work on the role of chromium ( I I I ) in diabetes was begun in 1959 by Dr . Wal ter Mertz. The polarographic study of the interaction of chromium ( I I I ) , insulin, and mitochondrial membranes was an independent confirmation of a mechanism originally proposed by Dr . Mertz. He will publish the results of clinical studies on diabetes when all of the da ta is avai l able.
The chromium levels in certain organs of the body have been measured and statistical da ta suggest t ha t for the Philippine people, the blood chromium levels are elevated.
Will iam C. Pu rdv
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For the first time, 8 samples may be migrated and measured in 90 minutes, reliably and conveniently. Repeatable within 2 % . SPECTROPHOR I . . . t ruly the ult imate in a fully integrated electrophoresis system housed in a superbly designed cabinet with console controls . Ano the r years -ahead product by Bausch & Lomb Incorporated, 81010 Bausch St., Rochester, N.Y. 14602.
SEE IT IN National In —Oct. 5-8
WASHINGTON—at the stitute of Health Show 1964.
BAUSCH & LOMB In Canada, write Bausch & Lomb Optical Co., Ltd., Dept. 810 Scientific Instrument Division, 16 Grosvenor St., Toronto 5, Ont. Circle No. 32 on Readers' Service Card
VOL. 3 6 , N O . 1 1 , OCTOBER 1964 · 9 3 A
