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ALL the known colorimetric methods for the determination of phosphate are liable to errors arising from (a) slight changes in acidity and concentration of reagents, and (b) the presence of interfering substances (e.g. fluorides, nitrites etc.). The following method is almost entirely independent of these disturbing factors, and possesses the added advantage of being more sensitive than those previously described.
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Berenblum et al. (1938) studied this question.
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