Untersuchungen an reagenzien zur photometrischen zinnbestimmung |
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Authors: | Gerhard Ackermann Hanspeter Heegn |
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Institution: | Sektion Chemie an der Bergakademie Freiberg, Lehrstuhl für Analytische Chemie, Freiberg Sachsen DDR;Forschungsinstitut für Aufbereitung der Akademie der Wissenschaften der DDR, Freiberg Sachsen DDR |
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Abstract: | The formation of complexes between tin(IV) and o-diphenols, and o-hydroxyquinones, has been studied spectrophotometrically. Simple o-hydroxyquinones do not react with tin(IV), chloranilic acid gives an SnR2 complex, and o-diphenols give SnR3 complexes. The reactions of tin(IV) with hydroxyxanthene dyes to give coloured products were considered for their possible analytical utility: the pH range, absorption spectrum, solubility and composition of the complexes were investigated, and the stability constants determined. Analytical procedures have been developed for tin and checked for precision and sensitivity: gallein and hydroxyhydroquinonephthalein (dihydroxyfluorescein) are to be recommended. |
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