摘要
目的基于吹扫捕集-气相色谱-原子荧光法,对生活饮用水中烷基汞进行分析。方法考察仪器载气流速、色谱柱温度和吹扫流速等条件对烷基汞峰形的影响,并探讨醋酸-醋酸钠和柠檬酸-柠檬酸钠两种缓冲液对烷基汞测定的影响,在最优条件下,对本实验进行方法学考察。结果甲基汞和乙基汞在0.0~20.0 ng/L范围内线性良好,相关系数为0.999以上,最低检测浓度均为0.03 ng/L。在三个不同加标水平(1.0、5.0和10.0 ng/L)下的加标回收率分别为90.4%~108.0%和103.8%~131.0%,日内相对标准偏差(RSD)均小于5.6%。结论采用吹扫捕集-气相色谱-原子荧光技术建立的水中烷基汞测定方法,操作简单且灵敏度高,满足生活饮用水中痕量烷基汞的测定要求。
Objective A method for the determination of alkyl mercury( methyl mercury and ethyl mercury) in drinking water was established by purge and trap-gas chromatography coupled with atomic fluorescence spectrometry. Methods The effects of the instrument,including carrier gas flow-rate,column temperature,purge flow-rate and so on,on the peak shape of alkyl mercury were investigated in detail. Furthermore,the effects regarding two buffers of the acetic acid-sodium acetate and the citric acid-sodium citrate on the determination of alkyl mercury were discussed. Under the optimized conditions,the method ology of this experiment was investigated. Results The method of methyl mercury and ethyl mercury gave good linear in the ranges of 0. 0-20. 0 ng/L with the correlation coefficients over 0. 999,and the minimum-detection concentration was 0. 03 ng/L.Furthermore,the recovery rates of three different concentration levels( 1. 0 ng/L,5. 0 ng/L,10. 0 ng/L) were in the ranges of90. 4%-108. 0% and 103. 8%-131. 0%,respectively,with the intra-day relative standard deviation( RSD) less than 5. 6%.Conclusions The method for the determination of alkylmercury in drinking water was established by purge trap-gas chromatography-atomic fluorescence spectrometry,which could fulfill the determined requirements of the trace alkyl mercury in drinking water with simple way and high sensitivity.
作者
李浩然
陶晶
张永
陈绍占
李婷
刘丽萍
LI Hao-ran;TAO Jing;ZHANG Yong;CHEN Shao-zhan;LI Ting;LIU Li-ping(Beijing Center for Disease Prevention and Control/Beijing Research Center for Preventive Medicine,Beijing 100013,China)
出处
《首都公共卫生》
2021年第5期306-311,共6页
Capital Journal of Public Health
关键词
烷基汞
吹扫捕集-气相色谱-原子荧光法
生活饮用水
Alkyl mercury
Purge and trap-gas chromatography-atomic fluorescence spectrometry
Drinking water
