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In order to solve the problems of low detection efficiency of phosphate in boiler water and cooling water of nuclear power plant, the automation operation has not been realized, and the operation risk of radioactive samples is high, a flow injection method for the determination of phosphate was investigated. The method is based on the reaction of phosphate with molybdate and metavanadate to form yellow phosphovanadium molybdic acid complex in acid medium, and the detection is carried out at the wavelength of 420 nm. The results show that the method exhibits good linearity in the phosphate mass concentration range of 0-500 mg/L (correlation coefficient R=0.999), with a method detection limit of 2.28 mg/L. The relative standard deviations at low, medium, and high concentration levels are 2.41%, 1.61%, and 1.33%, respectively. Compared with the conventional spectrophotometric method, the relative error ranges from -0.81% to 1.27%. This method meets the requirements for phosphate determination in nuclear power plant boiler feed water and cooling water. The method enables fully automated sample analysis, with an analysis cycle of only 100 seconds per sample, significantly improving detection efficiency and automation level while greatly reducing the risk of radioactive exposure to operators. It provides an efficient, accurate, and safe automated analytical technique for rapid and precise phosphate detection in the field of nuclear power chemistry, demonstrating important engineering application value.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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