Abstract
Rapid methods are described for the determination of the major constituents in silicate rocks. SiOg and AlgC^ are determined spectrophotometrically on aliquots of a solution prepared by fusion of the sample with NaOH. A molybdenum blue method is used for SiOg and f err on is used in the determination of A^OS. A second solution prepared by digestion of the sample with HF and HgSC^ is used for the determination of TiOg, total iron, MnO and PgO5> by spectrophotometric methods. TiO2 is determined as the peroxide, total iron as ferric chloride, MnO as permanganate, and FgOg as molybdivanado phosphoric acid. Additional aliquots of the solution prepared after digestion with HF plus H2SO4 are used for the determination of CaO and MgO by titration methods, using versene. Another aliquot of the same solution is used for the determination of KgO and NagO by flame photometer. FeO is determined by titration with KgCrgOY after decomposition of the sample with HF and HgSO^.. Loss on ignition is determined so that a summation may be obtained and used as an aid in checking the reliability of the results. A schedule for rapid complete analysis of silicate rocks in sets of eight samples is given. Results of rapid analysis of twelve synthetic mixtures prepared from National Bureau of Standards standard samples are compared with values based on those reported by the Bureau of Standards. RAPID ANALYSIS OF SILICATE ROCKS
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