Abstract

Orthophosphate in turbid natural waters exists in dissolved and adsorbed forms. Phosphate adsorbed on suspended matter in turbid waters is difficult to determine spectrophotometrically. In the voltammetric method, the peak current is related to the reoxidation of the molybdophosphate complex at a glassy-carbon electrode. This allows the determination of dissolved and adsorbed phosphate at micromolar levels in natural waters, especially turbid waters, with good precision and accuracy.

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