The precision and accuracy of methods for the determination of dissolved silica in natural waters can be greatly improved by taking account of the time courses of some of the reactions involved. The kinetics of these reactions are dependent on the concentrations of electrolytes present in the samples. Based on results from a metol-sulfite reduction method, the molar absorptivity of a reduced mixture of the α-and β-isomers of molybdosilicic acid in sea water is apparently affected only by the ionic strength but not by the nature of the component salts of the solution.
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Fanning et al. (1973) studied this question.