Concentration methods in spectrographic analysis. II. Recovery of trace constituents in plant materials and soil extracts by mixed organic reagents

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Abstract
A concentration method, employing precipitation by means of a mixture of 8‐hydroxyquinoline, tannic acid and thionalide, is described for the simultaneous recovery of Co, Ni, Mo, Cr, V, Be, Ge, Sn, Pb, Ti, and Zn, from solution in a form suitable for spectrographic analysis. Combined spectrographic and chemical errors seldom exceed ± 10% for individual determinations. The ranges covered arc 2–50 μg. for Co, Ni, Mo, Cr and V, and 5–100 μg, for the other elements except Zn, where the range is 0·2–4 mg. Details are given for the application of the method to the determination of trace constituents in plant materials and soil extracts. The use of other organic reagents in conjunction with 8‐hydroxyquinoline is also discussed.