引用本文:黄文婷,周俊,张奇磊.水体中总氮测定的影响因素及方法改进[J].环境监控与预警,2017,9(6):45-47
HUANG Wen ting, ZHOU Jun,ZHANG Qi lei.Influencing Factors and Improvement of the Methods for Determination of Total Nitrogen In Water[J].Environmental Monitoring and Forewarning,2017,9(6):45-47
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水体中总氮测定的影响因素及方法改进
黄文婷,周俊,张奇磊
常州市环境监测中心,江苏 常州 213001
摘要:
对浊度、氯离子及高浓度氨氮对国标法测定总氮的影响进行分析。结果显示,浊度会使地表水中总氮测定的结果偏低,采用消解后3 500 r/min离心可以基本消除该影响;氯离子质量浓度>3 000 mg/L时,对220 nm处吸光度值出现正干扰;水体中氨氮浓度较高时,会出现总氮测定结果严重偏低的现象,采用趁热摇匀法可以有效地避免高氨氮的干扰。
关键词:  总氮  浊度  氯离子  氨氮
DOI:
分类号:X832
文献标识码:B
基金项目:
Influencing Factors and Improvement of the Methods for Determination of Total Nitrogen In Water
HUANG Wen ting, ZHOU Jun,ZHANG Qilei
Changzhou Environmental Monitoring Center, Changzhou, Jiangsu 213001,China
Abstract:
The influence of turbidity, chloride ion and high concentration ammonia nitrogen on the determination of total nitrogen by GB method was analyzed. The test results show that turbidity results in low total nitrogen in surface water, centrifugation under 3 500 r/min after digestion can basically eliminate the influence. When the concentration of chloride ion is higher than 3 000 mg/L, it causes positive interference on 220 nm absorbance. When the concentration of ammonia nitrogen is high, the total nitrogen will be on the low side,an effective way to avoid the interference of high ammonia nitrogen is shake the digestion solution when it is hot.
Key words:  Total nitrogen  Turbidity  Chloride ion  Ammonia nitrogen