COLEMAN
Scope of Coleman Nitrogen Analyzer extended to 2 0 ppm in trace studies by California Research Corporation* * California Research Corporation is the research arm of Standard Oil of California. Results of the work are reported in "Automatic Dumas Nitrogen Analysis of Lubricating Oils and Additives," by Farley, Guffy and Winkler, ANALYTICAL CHEMISTRY, Vol. 36, Page 1061, May 1964. Reprints and product literature are available from Coleman Instruments Corporation. With the Coleman Model 29 Nitrogen Analyzer, trace quantities of nitrogen in lubricating oils and additives are determined at Calresearch and in an increasing number of the California Chemical Company** (Oronite) customers' laboratories. With only slight procedure modifications, the instrument is being used with samples containing as little as 0.2% nitrogen. At lower nitrogen levels—down as far as 20 p p m — a specially-developed concentration technique provides adsorption of the nitrogen compounds on alumina. T h e trace analyses are then made on this nitrogen-bearing adsorbent. Expanded use of nitrogen-containing additives in lubricating oils brought increased interest in nitrogen determination, a convenient method for correct preparation of additives and for proper product blending. Prior to the use of the Coleman Nitrogen Analyzer in this application, California Research employed alternate methods which left much to be desired from standpoints of speed, convenience and economy. ** Chemical marketing company of Standard Oil Company of California
With sample materials from rose petals to natural fertilizers, from industrial compounds to biological fluids, the unit is proving its versatility in laboratories throughout the world. It is equally valuable in process control and in research, in both the physical and life sciences. If your work involves any aspect of nitrogen determination, investigate the Coleman Nitrogen Analyzer. Ask your laboratory supply dealer for a demonstration. CONDENSED
SPECIFICATIONS:
Sample Size
Normally 5 to 50 mg; 1 to 500 mg or more, depending upon nitrogen content of sample.
Speed
Normal operating cycle is 8 minutes; automatically extendable by delay circuit.
Accuracy
± 0 . 2 % nitrogen of theoretical nitrogen content at routine levels.
Range
Accepts any sample that combusts at temperatures up to 1000°C.
COLEMAN 42
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