Iron(II) and iron(III) can be completely extracted from M sulphuric acid into a 0·02 M solution of 2-mercaptopyridine-1-oxide and determined absorptiometrically at 550 mµ. The only significant interference is from copper(II); the sensitivity of the method is 0·02 µg cm–2.
J. A. W. Dalziel and M. Thompson, Analyst, 1966, 91, 98 DOI: 10.1039/AN9669100098
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