碳纳米管分离富集-原子荧光光谱法测定化妆品中的痕量汞  

Determination of mercury(Ⅱ) in cosmetic samples by atomic fluorescence spectrometry after preconcentration and separation on multi-walled carbon nanotubes

作　　者：苑春刚[1] 张艳[1] 张杨阳[1] 

机构地区：[1]华北电力大学环境科学与工程学院,保定071003

出　　处：《分析试验室》2011年第7期42-44,共3页Chinese Journal of Analysis Laboratory

基　　金：教育部新世纪优秀人才支持计划(NCET-10-0341);中央高校基本科研业务费项目(10ZG01);河北省自然科学基金(B2010001676)资助

摘　　要：建立了多壁碳纳米管分离富集-原子荧光光谱法测定化妆品中痕量汞(Hg2+)的新方法,考察了Hg2+在碳纳米管填充固相萃取柱上的吸附行为,优化出了最佳吸附和洗脱条件。优化后的实验条件:pH4,流速2.0 mL/m in,络合剂1 g/L吡咯烷二硫代氨基甲酸铵(APDC)溶液用量1.0 mL;洗脱剂采用6 mol/LHNO3,流速为0.5 mL/m in。样品体积50 mL的条件下,方法的检出限为0.0027ng/mL,线性相关系数为r2=0.997。应用该方法成功测定了化妆品中的痕量汞。A solid phase extraction method for preconcentration of Hg2＋ based on multiwalled carbon nanotubes（WNTs） was established in this paper.300 mg of the carbon nanotubes was packed in a mini-column.The variables affecting Hg2＋ preconcentration were investigated and optimized.50 mL of Hg2＋ solution was preconcentrated by using 1.0 mL of 1 g/L APDC solution as chelating reagent at pH 4.0.The adsorbed Hg2＋ was eluted by 5 mL of 6 mol/L HNO3 solution at the flow rate of 0.5 mL/min and then Hg2＋ in the elution was determined by atomic fluorescence spectrometry.The potential effects of common coexisting ions were also investigated,and no obvious impact on the extraction was found.A low detection limit（3s,0.0027 ng/mL） and good correlation coefficient（r2=0.997） were obtained for Hg2＋ detection.The established method was successfully applied to the analysis of Hg2＋ in cosmetic samples.

关 键 词：碳纳米管 汞 化妆品 富集 

分 类 号：O657.3[理学—分析化学]