Chemicals | Analytical Chemistry

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Fourier T r a n s f o r m Spectrophotometer Model 318S FT spectrophotometer has a minimum frequency range of 3800-625 c m - 1 . Resolution is eight wave numbers up to a maximum of two wave numbers with modifica­ tions. The minimal system is a 16K core computer with a maximum of 64K available. Willey Corp. 424

So what is the moon made of? Data provided by the Apollo, Surveyor and Luna missions give us the answer.

Specific Ion Electrodes A line of 16 solid-state specific-ion electrodes includes arsenic-5, residual chlorine, chromium 6, and phosphoric 5—available as monoprobes or with built-in reference as combination probes. A series of ppm standards permits calibration accuracies of ±2%. Monoprobes are priced at $125, and combination probes at $165. Chemtrix, Inc. 436

To find out, fill in the coupon below and send for a copy of The Chemical Composition of the Lunar Surface by Anthony Turkevich, University of Chicago reprinted from Accounts of Chemical Research,

Petroleum Colorimeter This instrument is designed to con­ form to ASTM Method 1500D for the visual determination of the color of petroleum products, heating oils, die­ sel fuels, waxes, and related lubri­ cants. The unit consists of a standar­ dized light source, cylindrical glass jars for the sample, and a circular turret containing 16 color standards. Lovibond of America, Inc. 433

March 1973 9 pages with cover

0214/10405

The Chemical Composition of the Lunar Surface $2.00 Anthony L. Turkevich

Name: Address: Zip

Mail With Remittance To: Journals Department American Chemical Society 1155 16th Street, N.W. Washington, D.C 20036

Chemicals Electrophoresis Reagents A complete line of specially purified gel electrophoresis reagents includes acrylamide and N,iV-methylenebisacrylamide, buffer components, and stains. A 12-p pamphlet lists 169 re­ agents for electrophoresis and 90 lit­ erature references to their use. Polysciences, Inc. 439 A m i n o A c i d Analysis Kit A complete kit for the analysis of amino acids by gas-liquid chromatog­ raphy permits 24 analyses per 8-hr day. With inexpensive reagents, all 21 common amino acids are derivatized in 30 min by a simple test tube proce­ dure. The derivative used is the npropyl, iV-acetyl. Gallard-Schlesinger Chemical Mfg. Corp. 440

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ANALYTICAL CHEMISTRY, VOL. 46, NO. 7, JUNE 1974 · 669 A