LOENCO INC.
Transcript of LOENCO INC.
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
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Circle No. 11 on Readers' Service Card
VOL. 36, NO. 11, OCTOBER 1964 · 9 1 A
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