Hydrogen sulphide is partially oxidised by iron(III) when soils containing sulphide and iron(III) oxide are acidified. Satisfactory recoveries of hydrogen sulphide are obtained by using a solution of tin(II) chloride in hydrochloric acid to decompose the sulphide.
G. Pruden and C. Bloomfield, Analyst, 1968, 93, 532 DOI: 10.1039/AN9689300532
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