Catalytic Kinetic Spectrophotometric Method for Determination of Phosphate Ion
Catalytic Kinetic Spectrophotometric Method for Determination of Phosphate Ion作者机构：Faculty of Sciences and Mathematics Department of Chemistry University of Nig Visegradska 33 P.O. Box 224 18000 Nis Serbia
出 版 物：《Chinese Journal of Chemistry》 (中国化学（英文版）)
年 卷 期：2007年第25卷第4期
页 面：531-534页
核心收录：
学科分类：083001[工学-环境科学] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 08[工学] 09[农学] 0903[农学-农业资源与环境] 090301[农学-土壤学]
基 金：the Ministry of Science Serbia(142015) the Ministry of Science
主 题：kinetic spectrophotometric method sodium pyrogallol-5-sulphonate phosphate oxygen oxidation determination water soil
摘 要：The kinetic method for the determination of phosphate microamounts was described. The developed method is based on catalytic effect of phosphate on sodium pyrogallol-5-sulphonate （PS） by dissolved oxygen. The reaction was followed spectrophotometrically by measuring the rate of change in the values of the absorbance of the oxidation product at 437 nm. The optimum reaction conditions are PS （0.44×10^-3 mol·L^-1） and HClO4 （3.6×10^-6 mol·L^-1） at 25 ℃. Following this procedure, phosphate can be determined with a linear calibration graph up to 0.23 μg·mL^-1. The interference effect of several species was also investigated and it was found that the most common cations and anions did not interfere with the determination. The developed procedure was successfully applied to the determination of phosphate in natural waters and soil.
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