| 摘要: |
| 总磷是评价水质的一项重要指标，现对样品中悬浮物（泥沙）含量、加酸保存样品保存时间与调节pH值对总磷测定的影响进行研究。结果表明，随着沉降时间的延长总磷测定值逐渐降低，加酸保存的样品总磷测定值随保存时间的延长而增高，且测定时是否调回中性对测定结果基本无影响。故进行地表水中总磷的测定需严格按照标准规定的样品采样过程控制采样沉降时间，加酸保存,24h以内进行测定，测定时无需调回中性。 |
| 关键词: 地表水 泥沙 自然沉降时间 pH值 总磷 |
| DOI： |
| 分类号:X832;O657.32 |
| 文献标识码:B |
| 基金项目: |
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| Investigation on the Factors Affecting the Determination of Total Phosphorus in Surface Water |
|
WANG Baoqin， DOU Yanyan， ZHANG Xuelu
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Nanjing Environmental Monitoring Center， Nanjing，Jiangsu 210013， China
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| Abstract: |
| Total phosphorus content in surface water is an important index to evaluate the water quality. This paper mainly aimed at studying the influences of suspended sediment （silt） in the sample， the different storage time， regulation of pH on the determination of total phosphorus. The results showed that the concentration of total phosphorus decreased with time. And no difference of the total phosphorus concentration was observed between the neutral samples and the samples being added acid in 24 h. During the sampling process， the total phosphorus concentration increased with the increase of storage time， thus the dissolution of total phosphorus in water samples with suspended sediment should be fully considered. |
| Key words: Surface water Sediment Natural settling time pH Total phosphorus |
