文献类型：期刊文献

英文题名：Highly selective in situ metal ion determination by hybrid electrochemical "adsorption-desorption" and colorimetric methods

作者：Li, Meng[1];Li, Da-Wei[1];Li, Yuan-Ting[1];Xu, Dan-Ke[2];Long, Yi-Tao[1]

机构：[1]E China Univ Sci & Technol, Shanghai Key Lab Funct Mat Chem, Shanghai 200237, Peoples R China;[2]Nanjing Univ, Dept Chem, Nanjing 210093, Peoples R China

年份：2011

卷号：701

期号：2

起止页码：157

外文期刊名：ANALYTICA CHIMICA ACTA

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000294144400006)】；

基金：This research was supported by the National High-Tech Research and Development Program 863 of China (2008AA06A406), the Ministry of Health (2009ZX 10004-301), the Major Research Plan of the Natural Science Foundation of China (Grant no. 91027035), the Fundamental Research Funds for the Central Universities (Grant no.WK1013002) and the National Natural Science Foundation for Young Scholars of China (Grant no. 21007015). YTL is supported by the Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning.

语种：英文

外文关键词：Heavy metal ions; Hybrid methods; Adsorption-desorption; Colorimetric analysis; Screen-printed electrode

摘要：A novel and facile hybrid analytical method coupling electrochemical "adsorption-desorption" and colorimetric analyses was developed to detect heavy metal ions in turbid water samples. The target metal ions were deposited onto an electrode inserted into the original sample, which was referred to as the "adsorption" process. After changing the medium, the concentrated target metal ions were dissolved in a new, clean buffer (blank buffer), which was referred to as the "desorption" process. The concentrations of the target metal ions were measured by colorimetric analyses after the addition of specific indicator amounts. We demonstrated the applicability of this method by detecting Cd2+, Pb2+ and Cu2+ with co-depositing Bi3+ on portable screen-printed electrodes (SPEs). A good correlation (correlation coefficient of R=0.997) was observed between concentrations ranging from 1 to 200 mu M and absorbance values. After the multiple "desorption" process, the even better detection limits as low as 10, 10 and 100 nM were achieved for Cd2(+), Pb2+ and Cu2(+), respectively. The practicality of this hybrid method was confirmed by the detection of Cd2+, Pb2+ and Cu2+. in wastewater samples, and these results were in agreement with inductively coupled plasma atomic emission spectroscopy (ICP-AES). Overall, this hybrid method provides a simple, selective and effective technique for environmental pollutant analyses. (C) 2011 Elsevier BM. All rights reserved.