| 气相分子吸收光谱法测定海水中氨氮的干扰因素识别及预处理方法研究 |
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| 引用本文： | 郑鑫吾,封莉,刘永泽,张立秋,许秀艳,郝俊.气相分子吸收光谱法测定海水中氨氮的干扰因素识别及预处理方法研究[J].中国环境监测,2022,38(2):172-178. |
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| 作者姓名： | 郑鑫吾 封莉 刘永泽 张立秋 许秀艳 郝俊 |
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| 作者单位： | 北京林业大学, 北京市水体污染源控制技术重点实验室, 北京 100083;北京林业大学环境科学与工程学院, 北京 100083;中国环境监测总站, 国家环境保护环境监测质量控制重点实验室, 北京 100012;上海安杰环保科技股份有限公司, 上海 201906 |
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| 基金项目： | 国家重点研发计划专项(2018YFF01011705);校企合作项目(2D2X-00-H&T-03) |
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| 摘 要： | 采用气相分子吸收光谱法测定海水样品中的氨氮,重点考察海水中共存离子对氨氮测定结果的影响规律,识别测定过程中主要的干扰因素,并提出消除干扰的预处理方法.研究结果表明,碘离子会对氨氮的测定产生负干扰,当样品中碘离子质量浓度达到0.0765 g/L时,氨氮的测定结果与标准值相比明显降低,且在碘离子质量浓度达到0.1910 g...
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| 关 键 词： | 气相分子吸收光谱法 氨氮 海水 碘离子 预处理方法 |
| 收稿时间： | 2021/5/11 0:00:00 |
| 修稿时间： | 2021/11/22 0:00:00 |
Research on Identification of Interference Factors and Pretreatment Methods for Determination of Ammonia Nitrogen in Seawater by Gas-phase Molecular Absorption Spectrometry |
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| ZHENG Xinwu,FENG Li,LIU Yongze,ZHANG Liqiu,XU Xiuyan,HAO Jun.Research on Identification of Interference Factors and Pretreatment Methods for Determination of Ammonia Nitrogen in Seawater by Gas-phase Molecular Absorption Spectrometry[J].Environmental Monitoring in China,2022,38(2):172-178. |
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| Authors: | ZHENG Xinwu FENG Li LIU Yongze ZHANG Liqiu XU Xiuyan HAO Jun |
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| Institution: | Beijing Key Laboratory for Source Control Technology of Water Pollution, Beijing Forestry University, Beijing 100083, China;College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China;National Key Laboratory of Environmental Monitoring and Quality Control for Environmental Protection, China National Environmental Monitoring Centre, Beijing 100012, China; Shanghai Anjie Environmental Protection Science & Technology Co., Ltd., Shanghai 201906, China |
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| Abstract: | In this paper,gas-phase molecular absorption spectroscopy is used to determine ammonia nitrogen in seawater samples,focusing on the influence of coexisting ions in seawater on the results of ammonia nitrogen determination,identifying the main interference factors in the measurement process,and putting forward a pretreatment method to eliminate interference.The research results show that iodide ions will negatively interfere with the determination of ammonia nitrogen.When the iodide ion concentration in the sample reaches 0.076 5 g/L,the determination result of ammonia nitrogen is significantly lower than the standard value,and when the iodide ion concentration reaches 0.191 0 g/L,the downward trend eases and the measured value of ammonia nitrogen reaches the detection limit.Both potassium iodate oxidation method and silver nitrate precipitation method can be used to eliminate interference.The treatment effect of silver nitrate precipitation method is significantly better than that of potassium iodate oxidation method,making the detection result the same as the standard value,eliminating many pre-processing steps,which is beneficial gas phase molecular absorption spectroscopy for large-scale seawater sample measurement. |
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| Keywords: | gas phase molecular absorption spectroscopy ammonia nitrogen sea water iodide ion pretreatment method |
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