摘要
文章通过系列实验考察了不同样品泵转速与氧化剂泵转速时方法的性能表现,研究了氧化反应体系变化对气相分子吸收光谱法测定水中NH_(3)-N的影响。样品泵转速相同时,增大氧化剂的用量时,方法的线性范围提高,校准曲线的斜率减小。氧化剂泵转速相同时,曲线的斜率随样品泵转速提高而变大,但测定的线性范围变窄。当样品泵转速为50r·min^(-1),氧化剂泵转速为20r·min^(-1)时,方法的检出限仅为0.006mg·L^(-1),适用于低浓度样品的测定,氧化剂泵速为更大的60r·min^(-1)则适用于高浓度样品的测定。两种氧化剂泵速条件下测定实际样品,结果的RSD均低于2.5,加标回收率在90%~100%之间,与纳氏试剂分光光度法测定的结果之间不存在显著差异。
The performance of the method under different rotation speeds of the sampling pump and oxidant pump was measured by a series of experiment,and the effect of changes in the oxidation reaction system on the determination of ammonia nitrogen in water by gas phase molecular absorption spectrometry was studied.When the speed of the sample pump is kept constant and the amount of oxidant is increased,the linear range of the method increases and the slope of calibration curve decreases.When the rotation speed of the oxidant pump is the same,the slope of the curve increases with the rotation speed of the sample pump,but the linear range of the method becomes narrower.When the sample pump speed is 50r·min^(-1)and the oxidant pump speed is 20r·min^(-1),the detection limit of this method is only 0.006mg·L^(-1),which is suitable for the determination of low-concentration samples,and the oxidant pump speed of 60r·min^(-1)is suitable for the determination of high-concentration samples.The actual samples were measured under the conditions of two oxidant pump speeds,the results showed that the RSD was lower than 2.5,and the recovery rate of standard addition was between 90%and 100%.No significant difference was found between the results measured by Nessler reagent spectrophotometry and gas phase molecular absorption spectrometry.
作者
林美芳
张阳
陈小军
谭婉蓉
罗仙平
LIN Mei-fang;ZHANG Yang;CHEN Xiao-jun;TAN Wan-rong;LUO Xian-ping(Jiangxi Ganzhou Eco-Environmental Monitoring Center,Ganzhou 341000,China;School of Resources and Environmental Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,China;Jiangxi Key Laboratory of Mining&Metallurgy Environmental Pollution Control,Jiangxi University of Science and Technology,Ganzhou 341000,China)
出处
《化学工程师》
CAS
2022年第10期22-26,共5页
Chemical Engineer
基金
江西省科技创新人才专项(20165BCB18013)。
关键词
气相分子吸收光谱法
氨氮
氧化反应
gas phase molecular absorption spectrum
ammonia nitrogen
oxidation reaction
