372595866

JPRS-UMS-92-003 16 March 1992

ANALYSIS, TESTING

5

Proximate Photometric Antimony Identification in Nonferrous Alloys

927D0081D Moscow ZA VODSKA YA LABORATORIYA in Russian Vol 57 No 12, Dec 91 pp 9-10

[Article by I.S. Novikova, V.V. Fedorov, N.S. Yershova, V.V. Orlov, V.M. Ivanov, Central Scientific Research Institute of Materials Science, Kaliningrad, Moscow oblast]

UDC [546.86+546.19]:543.432

[Abstract] The shortcomings of known methods of antimony identification in nonferrous metals and alloys and the difficulty of antimony identification in the presence of tin are addressed and a new photometric method of antimony (III) identification is proposed. The method is based on forming a red-dyed complex compound of antimony with 9-(n-dimethylaminophenyl)-2,3,7-trioxylfluorone-6 (PDMAFF). The reagent forms a stable chelate compound with antimony in a 1:2 metal-:reagent ratio (measured by the isomolar method). The complex has the peak light absorption at 560 nm and the reagent—at 460 nm; the color reaction contrast is 100 nm and the chelate compound’s molar absorptance is 5.2 x 10⁴. A standard antimony solution prepared from a 99.99% metallic antimony is used; it is shown that the method^łs optimum antimony (III) chelation region is pH 1.0-1.5 and that the presence of Zn, In, Ga, Al, Cu, and Mn (II) virtually does not impede antimony identification while Sn, Ge, Fe, Nb, and Ti does. The analytical procedurę is described and the results of an analysis of several nonferrous alloy samples are summarized. The method has an adequate accuracy and sensitivity and makes it possible to identify antimony in alloys without separating it from the base, as well as in alloys with a high tin concentration. Tables 1; references 3.

Photomechanical Identification of Palladium in Aminochloride Electrolytes

927D0081C Moscow ZA VODSKA YA LABORATORIYA in Russian Vol 57 No 12, Dec 91 pp 7

[Article by Ye.P. Parkhomenko, N.F. Falendysh, A.T. Pilipenko, Colloidal Chemistry and Water Chemistry Institute imeni A.V. Dumanskiy at the Ukrainian Academy of Sciences, Kicv]

UDC 546.98:543.062

[Abstract] The need for simple and proximate palladium identification techniques necessitated by extensive pal-ladium-coating applications in today*s technologies is discussed and a simple and proximate photometric method of palladium identification in aminochloride electrolytes is proposed. The new method is based on measuring the light absorption of palladium’s chloride complex [PdCl₂]²’. The underlying principles of the method and the analytical procedurę are described in detail and the results of an analysis of palladium-containing Solutions are summarized. The resulting data are compared to the results of gravimetric palladium identification with dimethylglyoxime. Although the new method’s metrological characteristics are somewhat infe-rior to those of the gravimetric method, it is much simpler and morę proximate. The method is also distin-guished by its adequate reproducibility and correctness of the analysis results and may be recommended for monitoring the palladium concentration in electrolytes and palladium-coating flushing water. Tables 1; references 4.

Tin Identification Within Broad Concentration Rangę in Nonferrous Metal Alloys

927D0081B Moscow ZA VODSKA YA LABORATORIYA in Russian Vol 57 No 12, Dec 91 pp 5-6

[Article by S.V. Toporov, N.L. 01enovich, Odessa State University imeni I.I. Mechnikov]

UDC 669.2/8:546.814:543.432

[Abstract] The difTiculties of tin identification in the course of certification analysis of nonferrous metal alloys due to the poor selectivity of the methods used is discussed and a new extractive photometric method based on extracting a complex of tin (IV) with ben-zoylphenylhydroxylamine (BFGA) or its analogues and measuring the light absorption of the heteroligand com-plex with phenylfluorone forming in the organie phase is described. The method has been used to identify tin in copper-, zinc-, and magnesium-based nonferrous metal alloys and commercial aluminum. To check the veracity of the results, standard samples are analyzed and method of additions is used, and data are compared to the results obtained by other methods. The analytical procedurę is outlined in detail and the conclusion is drawn that the new method is characterized by relative simplicity, high selectivity, and sensitivity and makes it possible reliably and quicidy to identify tin in samples of copper-, zinc-, and magnesium-based nonferrous metals and alloys. Tables 3; references 14: 13 Russian; 1 Western.

Investigation of Composite Materiał Failure by Mechanoluminescence Method Within Broad Loading Ratę Rangę

927D0063A Kiev PROBLEMY PROCHNOSTI in Russian No 9(267), Sep 91 pp 48-52

[Article by U.E. Krauya, P.P. Kalnin, Ya.L. Yansons, A.A. Strukovskis, Polymer Mechanics Institute at the Latvian Academy of Sciences, Riga]

UDC 620.17:678.01

[Abstract] The mechanoluminescence (ML) method— the appearance of glow during the loading of various materials, primarily polymer and composite, due to several microprocesses—is explained and the use of