Determination of Phosphate in Surface Water of Lopburi Province Using a Simple Flow Injection Analytical System
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Abstract
The objective of this research has been the development of a simple flow injection analytical system for the automatic determination of phosphate in water samples using the molybdenum blue method. Samples were injected and mixed with ascorbic acid used as a reducing agent. The absorbance of the resulting molybdenum blue complex was measured at 880 nm by a spectrophotometer. The proposed method showed reliability, high sensitivity, spend small amount of reagents and samples, and fast sample throughput (52 samples/hour). The limit of detection (LOD) was 0.015 mg P/L of phosphate. Precision obtained injecting a phosphate standard solution of 0.50 mg P/L (n=10) was 1.81%. This system can be applied to determination of phosphate content in surface water samples in Lopburi province by comparing with a standard method. It was found that obtained from the developed system agreed well with the standard method using the pair t-test (tstat 0.04 < tcrit 2.36).
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