A method for the determination of arsenic, bismuth, germanium, lead, antimony, selenium, tin and tellurium by means of hydride generation is described. The hydrides are generated by adding the acidified sample to dilute (1 per cent. m/ V ) sodium borohydride solution. The liberated hydrides are passed directly into a 17 cm long silica tube mounted in an airacetylene flame. The advantages of the proposed system are its simplicity, high Sensitivity, high speed of analysis and the fact that background correction facilities are not required.The generation of plumbane for analytical purposes does not appear to have been reported previously.
,, Ibid., 1973, 12, 6.
The determination of manganese, nickel, chromium, molybdenum, copper, vanadium, cobalt, titanium, tin, aluminium and lead in steel by a direct a 'omic-absorption method, which involves a single dissolution based on perchloric acid, is described. The scheme effects considerable savings in time compared with traditional methods, and is of comparable accuracy.The serious depressive interferences caused by iron on the response of some elements are overcome in the nitrous oxideacetylene flame, and minor effects are corrected for by inclusion of iron in calibration standards. No other inter-elemental interferences were encountered in perchloric acid based solutions in the presence of iron.Silicon and tungsten, which are not retained in solution in this scheme, are determined after a separate dissolution of the sample.Results obtained with British Chemical Standard steels are tabulated, and accuracies discussed. Chromium (up to 12.0 per cent.) *-Stock solution (1000 mg l-l)/ml . . Chromium, per cent. (0.25-g sample) Dilute stock solution (100 mg l-l)/ml Concentration/mg 1-l . . .. Molybdenum (up to 0.2 per cent.
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