SCHEDULED MAINTENANCE
Determination of orthophosphate in waters and soils using a flow analyser
Abstract
A high-performance continuous flow analyser has been used for the determination of orthophosphate ion in potable waters and soil extracts by the heteropolymolybdenum blue method. Interference from a number of common ionic species has been examined and found to be small at the levels encountered in potable waters. The limit of detection for PO43– was calculated to be 14.5 p.p.b. (4.8 p.p.b. of P), a linear calibration range of up to 0–100 p.p.m. was demonstrated and the sample throughput was better than 120 samples h–1 using the calibration range 0–4 p.p.m. and above, and 50 samples h–1 using the range 0–0.5 p.p.m.
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