Automatic micro-analytical apparatus for the determination of gases in metals

580

ABSTRACTS

Determination of niobium in stainless steel, R. St.-J. Emery, Metallurgia, 59, No. 352, 101 (1959). A photometric method involving the use of thiocyanate in acetone permits rapid determination of Nb in stainless steel with good reproducibility. Composite procedure for calorimetric determination of eleven elements in aluminum, M. C. Steele and L. J. England, Metallurgia, 59, No. 353, 153 (1959). Methods of determination of Fe, Cu, Si, Cr, Ni, Zn, Mn, Ti, V: Mg, and Pb in a l-g. sample of aluminum are described. Microchemical determination of copper with bromobenzotriazole, L. N. Lomakina and N. I. Tarasevich, Metody Analiza Redkikh i Tsvet. Metal. Sbornik, 1956, 33-39. Bromobenaotriazole precipitates Cu ++ (l-2 mg.) from solutions of pure salts in the range of pH 4.5-8.7. Microgram determination of tellurium by an induced reaction with ferric phenanthroline, C. 0. Ingamells and E. B. Sandell. Micro&em. J., 3, 3-12 (1959). An indirect photometric method for bhe determination of microgram quantities of tellurium(IV) is based on the reduction through an intermediate oxidation state of chromium. EDTA as a micro analytical reagent, A. J. Barnard, Jr., W. C. Broad, and H. Flaschka, Microchem. J., 3, 43-64 (1959). A review article, including 196 references, is presented on the use of ethylenediaminetetraacetic acid and its salts in analytical chemistry. Quantitative paper chromatography and direct titrimetric jinish for determination of zinc spot concentrations, A. Lacourt and P. Heyndryckx, Microchem. J., 3, 181-89 (1959). The method described for determination of Zn concentrations is applicable to amounts above 4 fig. with very good reproducibility. An advantage of the method is that it works with ordinary tools and reagents and can be carried out in any laboratory. Automatic micro-analytical apparatus for the determination of gases in metals, S. Yanagisawa, M. Seki, Y. Watanabe, and S. Nakamura, Mikrochim. Acta, 1959, 1-8. Vacuum fusion is followed by recording of the pressure with a rotary McLeod gage after isolation of the various gases. The path of the gases is controlled by timeswitches. Spectrophotometric determination of traces of gold with Rhodamine B. H. Onishi, Mikrochim. Acta, 1959, 9-17. Gold in l-10 pg. quantities is determined by benzene extraction of rhodamine B chloro-aurate. The procedure was tested with silicate ores. Calorimetric estimation based upon a silver sulfide scale and use of the ring oven technique, H. Weisz, M. B. Celap, and V. Almafan, Mikrochim. Acta, 1959,3643. A series of rings of silver sulfide obtained with known amounts of copper suffices for the estimation of Cu, Cd, Pb, Bi, As, Sb, Sn, MO, 00, Ni, Zn, Mn, Fe, and Cr. MICROCHEMICAL

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4