分散液相微萃取-连续光源-石墨炉原子吸收光谱法测定水样中痕量钴  

Determination of trace cobalt in environmental water by dispersive liquid-liquid microextraction combined with continuum source-graphite furnace atomic absorption spectrometry

作　　者：彭淑香 张丽君[1] 杨光冠[1,2] 张占恩[1] 徐知雄 

机构地区：[1]苏州科技学院环境科学与工程学院,江苏苏州215009 [2]江苏省环境科学与工程重点实验室,江苏苏州215009

出　　处：《苏州科技学院学报（工程技术版）》2015年第4期12-17,共6页Journal of Suzhou University of Science and Technology （Engineering and Technology）

基　　金：江苏省环境科学与工程重点专业类资助项目(601210003)

摘　　要：建立了以吡咯烷基二硫代氨基甲酸铵(APDC)为螯合剂,四氯乙烯为萃取溶剂,乙醇为分散剂的分散液相微萃取-连续光源-石墨炉原子吸收光谱法(DLLME-CS-GFAAS)测定水样中痕量钴的方法。详细探讨了p H值、萃取时间、温度、盐度等影响因素。结果表明,DLLME萃取5 m L水样中的钴的最佳条件为:p H=3,螯合剂0.012 g/L,萃取溶剂25μL,分散剂0.5 m L。在优化条件下,钴的检出限为0.03μg/L,线性范围为0.05~4.00μg/L,富集倍数60,对浓度为0.50、2.00μg/L Co^(2+)标准液分别测定10次的相对标准偏差为2.3%和1.7%。笔者准确、快速的测定了自来水、河水、湖水中痕量钴,结果令人满意。The method of dispersive liquid-liquid microextraction prior continuum source-graphite furnace atomic absorption spectrometry was used to determine the trace cobalt（II） in environmental samples with the ammonium pyrrolidine dithiocarbamate（APDC） as chelating agents, the tetrachloroethylene as extraction solvent and ethanol as dispersant, and the factors such as p H, extraction time, temperature and salinity, etc. have been discussed in detail. The results showed that the optimum conditions for the extraction of cobalt in 5m L samples are as follows：when p H is 3.0, temperature is 40 ℃, the volume of chelating, extraction agent and dispersants is 0.12 g/L,25 μL and 0.5 m L respectively. Under the optimum conditions, the detection limit of cobalt（II） in water samples is0.003 μg/L and the linear range is 0.05 ~4.00 μg/L. A preconcentration factor of 8 is reached, when the concentrations of 0.50 μg/L, 2.00 μg/L Cr（VI） standard solution are measured 10 times, the relative standard deviation is 2.3% and 1.7%. The method is used to determine the cobalt（Ⅱ） in actual samples with the satisfactory result.

关 键 词：连续光源原子吸收光谱法 分散液相微萃取 APDC Co2+ 

分 类 号：O657.3[理学—分析化学]