气相分子吸收光谱法测定水中硝酸盐氮  

Determination of Nitrate-nitrogen in Water by Gas-phase Molecular Absorption Spectrometry

作　　者：陈莹 白昕 王伟华 马倩 薛荔栋[2] 陈烨[2] 张霖琳[2] CHEN Ying;BAI Xin;WANG Weihua;MA Qian;XUE Lidong;CHEN Ye;ZHANG Linlin(Heilongjiang Province Harbin Ecological and Environmental Monitoring Center,Harbin,Heilongjiang 150076,China;China National Environmental Monitoring Center,State Environmental Protection Key Laboratory of Quality Control in Environmental Monitoring,Beijing 100012,China)

机构地区：[1]黑龙江省哈尔滨生态环境监测中心,哈尔滨150076 [2]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

出　　处：《中国无机分析化学》2023年第4期330-334,共5页Chinese Journal of Inorganic Analytical Chemistry

基　　金：国家环境保护标准修订项目(2020-24)。

摘　　要：硝酸盐氮是水环境质量重点监测项目之一,建立节省人力、高效快捷、抗干扰能力强的测定水中硝酸盐氮的方法十分必要。从载气类型、载气流量、定量方式、加热温度、载流液配比等方面系统地优化气相分子吸收光谱法测定水中硝酸盐氮的仪器条件。在优化的仪器条件下,工作曲线相关系数为0.9995;检出限为0.006 mg/L,测定下限为0.024 mg/L;标准物质测定的相对误差在0~0.60%,实际样品测定的相对标准偏差在0.50%~5.5%;实际样品加标回收率在89.0%~102%。方法的检出限、精密度和正确度良好,适用于水质硝酸盐氮的测定。Nitrate-nitrogen is one of the key monitoring items of water environmental quality, so it is necessary to establish an analytical method for testing nitrate nitrogen in water with labor saving, high efficiency and strong anti-interference ability.The instrument conditions for the determination of nitrate-nitrogen in water by gas-phase molecular absorption spectrometry are systematically optimized from the aspects of carrier gas type, carrier gas flow rate, quantitative method, heating temperature and carrier liquid ratio.Under the optimized instrument condition, the correlation coefficient of working curve is 0.999 5,the detection limit is 0.006 mg/L,and the lower limit of determination is 0.024 mg/L,the relative error range of standard substance is 0—0.6%,and the relative standard deviation range of actual samples is 0.50%-5.5%.The recovery of standard addition of actual samples ranged from 89.0% to 102%.The method has good detection limit, precision and accuracy, and is suitable for the determination of nitrate nitrogen in water quality.

关 键 词：水质 硝酸盐氮 气相分子吸收光谱法 

分 类 号：O661.1[理学—分析化学]