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| 离子色谱法测定地表水中总氮 |
| Determination of Total Nitrogen in Surface Water by Ion Chromatography |
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| DOI： |
| 中文关键词: 总氮 离子色谱法 地表水 |
| 英文关键词: Total nitrogen Ion chromatography Surface water |
| 基金项目: |
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| 中文摘要: |
| 采用碱性过硫酸钾消解水样，OnGuard Ⅱ Ba柱萃取、过滤，消解液中大量硫酸盐，离子色谱法测定地表水中总氮含量。试验表明，方法在0 mg/L~20.0 mg/L之间线性良好，相关系数r为0.999 4，方法检出限为0.007 mg/L。该方法与国标法同时测定标准物质，测定值均在定值范围内，6次平行测定结果的RSD分别为2.3%和1.8%，地表水样的加标回收率为95.7%～105%。实际水样的测定结果与国标法比对，无明显差异。 |
| 英文摘要: |
| The total nitrogen content in surface water was determined by ion chromatography after alkaline potassium persulfate digestion followed by OnGuard Ⅱ Ba column to eliminate a mass of sulfate. Tests showed that the good linearity was obtained between 0 mg/L~20.0 mg/L, with the correlation coefficient was 0.999 4. The method detection limit come to be 0.007 mg/L. Simultaneous determination of standard substance using the current method and the national standard method, the determined values were both in the range of customized. The RSDs of 6 parallel determination were 2.3% and 1.8%, and the spiked recovery of surface water sample ranged from 95.7%~105%. There were no significant difference between the current method and the national standard method for determining real samples. |
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