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紫外法测定水质中总氮的影响因素研究
引用本文:李秋波.紫外法测定水质中总氮的影响因素研究[J].中国环境管理干部学院学报,2013(3):65-68,76.
作者姓名:李秋波
作者单位:大连市环境监测中心,大连辽宁116023
基金项目:国家环境标准制修订《水质总氮的测定过硫酸钾氧化-紫外-可见分光光度法》(修订GB11894-89)(961)
摘    要:结合紫外法测定水质中总氮空白校正吸光度值易偏高、测定结果准确度低的问题,分别从检测试剂含氮量、选择实验用水、清洗玻璃器皿、改进实验操作、改进消解环境等多个方面分析了各影响因素对总氮测定的影响,相应提出了采用测定含氮量的方法筛选试剂、新制备的去离子水作为总氮实验用水、每次总氮实验使用新刷好的器皿、增加颠倒混匀步骤提高测定结果的准确度和精密度、高压蒸汽灭菌器应定时清洗换水等对策与建议。

关 键 词:总氮  紫外法  空白试验  标准样品  影响因素  准确度

Research on the Influence Factors of Total Nitrogen Determination in Water Quality by UV Spectrophotometric Method
Li Qiubo.Research on the Influence Factors of Total Nitrogen Determination in Water Quality by UV Spectrophotometric Method[J].Journal of Environmental Management College of China,2013(3):65-68,76.
Authors:Li Qiubo
Institution:Li Qiubo ( Dalian Environmental Monitoring Centre, Dalian Liaoning 116023, China)
Abstract:In view of the problems existed in total nitrogen determination in water quality that the absorbance value of blank correction is on the high side, and the accuracy of determination results is low, the article analyzed the influencing factors's impact on total nitrogen determination respec- tively from detecting reagent nitrogen compounds, selecting experimental water, cleaning glassware, improving experimental operation, improving digestion environment, and put forward some sugges- tions, such as screening reagent by determining nitrogen compounds, using fresh deionized water as experimental water, using new brushed glassware, adding the step of putting upside down and blending to improve the accuracy and precision, cleaning high pressure steam sterilizer and chang- ing water timing accordingly.
Keywords:total nitrogen  UV spectrophotometric method  blank test  standard sample  influenc-ing factors  accuracy
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