Abstract
A simple and rapid procedure is described for microanalysis of organic sulfur. SO 4 2− was precipitated by Ba 2+, when the sample decomposed with an oxygen flask. The excess Ba 2+ was potentiometrically back-titrated with 0.036 N NaTPB in the presence of PEG. The ternary complex, based on precipitate formation of an ion association complex has 1 mol equivalent Ba 2+ for 2 mol TPB −. The BF 4 − liquid membrane ion-selective electrode was used as the indicator. The presence of P, As, F, Si, N, Cl, Br, I, and B does not interfere with the quantitative microdetermination of organic sulfur. The absolute error is ± 0.3%.
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