Indirect polarographic determination of tripolyphosphate ions in the presence of other polyphosphates, with octyltin chloride.
Tripolyphosphate ions form a soluble complex with mono-octyltin cations, thus reducing the polarographic wave height ofthe octyltin. This provides a method for the determination of 2 x 10(-4)-4 x 10(-3)M tripolyphosphate in the presence of 2 x 10(-3)M ortho-, pyro-, trimeta-, and 10(-3)M tetrametaphosphate, together, or in any combination. The method is also insensitive to less than 2 x 10(-3)M magnesium or calcium and less than 10(-2)M sulphate.
Shaw
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Chemistry Department Birmingham University P.O. Box 363, Birmingham 15, U.K.
Townshend
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