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Supplement to A.S.T. M. Methods of Chemical Analyses of Metals.—This method is a revision of and supersedes the former Tentative Method of Quantitative Speetrochemical Analysis of Zinc Alloy Die Castings tor Minor Constituents and Impurities (E 27 - 35 T) which latter method appears on pages 248 to 254 of the Society's publication "A.S.T. M. Methods of. dhjeyiipil Analyses of Metals (1936;." Since this method replaces the former Tentative * leffrod^fy^ 3Ä'I^ this copy should be substituted in the compilation of Methods of Chemical Anatv?esw|petals.
- / / TENTATIVE METHOD OF TEST ^ \
QUANTITATIVE SPECTROCHEMICAL ANALYSIS OF ZINC ALLOY DIE CASTINGS FOR MINOR CONSTITUENTS AND
IMPURITIES1 A.S.T. M. Designation: E 27-37 T
This is a Tentative Standard and under the Regulations of the Society is subject to annual revision. Suggestions for revision should be addressed to the Headquarters of the Society, 26Ü S. Broad St., Philadelphia, Pa. 0*1^*
Issued, 1935; Revised, 1937.2 |V$
1. This method3 refers particularly to the analysis of zinc-base die- CC^ casting Alloy Nos. XXI and XXIII, covered by the Tentative Specifica-
tions for Zinc-Base Alloy Die Castings (A.S.T. M. Designation: B 86 - 38 T)_
of the American Society for Testing Materials.4 The method includes thej determination of copper in Alloy No. XXIII and of magnesium, iron, lead,! " «. tin and cadmium in Alloys Nos. XXI and XXIII. The determination ofj " '3 8 nickel in an alloy differing from Alloy No. XXIII by the presence of nickel) S:'" ^ as a minor constituent is also included. An arc spectrum is used, employing 5 \ graphite electrodes, one of which is treated with a solution of the sample tcj^ be analyzed. Quantitative estimations are made by the comparison of the; , ? spectrum of the sample with the spectra of standard samples of known. „ composition. '■'
Preparation of Sample Solution
2. A 20-g. portion -F a representative hturtpF "•! the alloy to be analyzed shall be v/eighed, placed u. a 250-ml. beaker, and dissolved In an equal voiitnse nurture of concentrated hydrochloric and nitric acids. If the volume of the solution is greater than 30 ml it -hall be evaporated to approximately 50 ml., cooled, transferred t-- a l0("-»d. graduate, nitric acid added to bring the volume to 60 ml. and the soktiui transferred to a small, glass-stoppered bottle, This procedure shall be repeated, thus making available duplicate sample solutions.
;t:i- iar a?.afior, ]
lt 1 ' ]-" pi":et lure is base! -.-.-"'- ti.e U-d-.niqu'- -"f sp.. . ;rriyrapi--.c analysis ascribed a-.- C. C. Nitci'.ie, 'Qualitative Analysis with.the Specvograph," Inluttrtd end Exsinterinz Cr.cmiUrv, Analytical Editi m. Vol. 1, p. 1 (1929).
- ' J'r.or.i'.«"s Am. Soc. Trstmg Mats. Vol. 38, Part I 0938); also 1938 Buok o' a. S T M Ten tative Standards. ...