流动注射编结反应器吸力洗脱-火焰原子吸收光谱法测定水样中铅锌  

A flow injection knotted reactor suction elution method coupled with flame atomic absorption spectrometry for the determination of trace lead and zinc in water

作　　者：李卓[1] 苏耀东[1] 王中瑗[1] 甘礼华[1] 

机构地区：[1]同济大学化学系,上海200092

出　　处：《冶金分析》2009年第12期13-16,共4页Metallurgical Analysis

基　　金：国家自然科学基金课题项目(No.29973029)

摘　　要：研究了流动注射编结反应器吸力洗脱法与火焰原子吸收光谱法(FAAS)联用快速富集和测定水样中痕量铅、锌的方法。洗脱过程依靠蠕动泵的吸力而不是蠕动泵的推力实现,大大降低了被分析物在洗脱过程中的分散。在样品富集流速6.0 mL/min、富集时间60 s的条件下,得到铅、锌的增感因子分别为32和40,检出限分别为8.1μg/L、0.44μg/L,样品输出为40样/h。平行测定200μg/L铅和10μg/L锌11次,相对标准偏差(RSD)分别为2.6%、2.9%。本方法特别适用于含量低、体积大的环境水样中铅、锌的分析。A new flow injection （FI） pre-concentration system through suction elution in a knotted reactor is developed for the determination of trace lead and zinc by flame atomic absorption spectrometry. In this method, the eluting process depends on the suction of the peristaltic pump, but not on the pushing force, which notably decrease the dispersion of the analyte. With preconcentration of 60 s at a flow rate of 6.0 mL/ min, the enhancement factor （EF） of Pb and Zn were found as 32 and 40, respectively. The detection limits were 8.1 μg/L and 0.44μg/L and the sample output rate was 40 sampies/hour. For parallel determination of 200 μg/L Pb and 10 μg/L Zn for eleven times, the relative standard deviations （RSDs） found were 2.6 % and 2.9 G, repectively. This method is especially suitable for determination of low content of lead and zinc in environmental water.

关 键 词：流动注射 编结反应器 吸力洗脱 火焰原子吸收光谱法 铅 锌 

分 类 号：O657.31[理学—分析化学]