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On Line Microwave Digestion for the Determination of Total Phosphorus in Water by Flow Injection Spectrophotometry

Su Ling

Abstract

A method for determination of total phosphorus in water samples by online microwave digestion and flow injection spectrophotometry is described in this paper.Effects of concentration of reagents and other conditions have been optimized.A detection limit of 0.015mg/L is achieved at a sampling frequency of 36/h.Calibration graphs are linear for ranges of 0～2.0mg/L phosphorus.The relative standard deviation is 1.0% for the determination of 0.634mg/L(n=11).The proposed method is successfully applied to the analyses of several waters.

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Key concepts: Spectrophotometry, Detection limit, Reagent, Microwave digestion, Chemistry, Relative standard deviation, Phosphorus, Analytical Chemistry (journal)