Journal article

SPECTROPHOTOMETRIC DETERMINATION OF DISSOLVED ORGANIC PHOSPHORUS IN NATURAL-WATERS USING IN-LINE PHOTO-OXIDATION AND FLOW-INJECTION

ID MCKELVIE, BT HART, TJ CARDWELL, RW CATTRALL

ANALYST | ROYAL SOC CHEMISTRY | Published : 1989

Abstract

A rapid in-line photochemical digestion for use with flow injection (FI) to determine the dissolved organic phosphorus (DOP) in natural waters is described. The FI system includes a simple ultraviolet (UV) photoreactor and uses the tin(II) chloride reduction of phosphomolybdate for the spectrophotometric determination of the dissolved reactive phosphorus (DRP) produced by the photo-oxidation. Samples in the range 0.1-4 and <0.1 mg I-1 of P can be analysed at rates of 72 and 50 samples h -1, respectively. The effective detection limit of the technique was 0.01 mgI-1. Comparison of the results for DOP obtained using the proposed method were in good agreement with those obtained using standard ..

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