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Abstract
Particulate phosphorus is recovered from a water sample on a cellulose nitrate membrane filter which is then dissolved in perchloric acid and digested at 170°C overnight. The released orthophosphate is determined without neutralization by the phosphomolybdate blue method of Murphy and Riley (1962). The method can be applied to the amounts of phosphorus retained on the filter ranging from 0.4 to 25 μg.