| Catalytic Kinetic Spectrophotometric Method for Determination of Phosphate Ion |
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| 作者姓名： | MITIC Snezana ZIVANOVIC Valentina OBRADOVIC Mirjana TOSIC Snezana PAVLOVIC Aleksandra |
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| 作者单位： | Faculty of Sciences and Mathematics, Department of Chemistry, University of Nig, Visegradska 33, P.O. Box 224, 18000 Nis, Serbia |
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| 基金项目： | Project supported by the Ministry of Science Serbia （No. 142015） and the Ministry of Science. |
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| 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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| 关 键 词： | 磷酸盐离子 测定方法 催化动力学分光光度分析 水 土壤 |
| 修稿时间： | 2006-04-242006-12-06 |
Catalytic Kinetic Spectrophotometric Method for Determination of Phosphate Ion |
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| MITIC Snezana ZIVANOVIC Valentina OBRADOVIC Mirjana TOSIC Snezana PAVLOVIC Aleksandra.Catalytic Kinetic Spectrophotometric Method for Determination of Phosphate Ion[J].Chinese Journal of Chemistry,2007,25(4):531-534. |
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| Authors: | MITIC Snezana ZIVANOVIC Valentina OBRADOVIC Mirjana TOSIC Snezana PAVLOVIC Aleksandra |
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| Institution: | [1]Faculty of Sciences and Mathematics, Department of Chemistry, University of Nig, Visegradska 33, P.O. Box 224, 18000 Nis, Serbia |
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| Abstract: | 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 °C. 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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| Keywords: | kinetic spectrophotometric method sodium pyrogallol-5-sulphonate phosphate oxygen oxidation determination water soil |
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