文献类型：期刊文献

英文题名：Colorimetric and dark-field microscopic determination of cadmium(II) using unmodified gold nanoparticles andbased on the formation of glutathione-cadmium(II) complexes

作者：Li, Li[1];Liu, Bing[1];Chen, Zhengbo[2]

第一作者：李丽

通讯作者：Li, L[1]

机构：[1]Xinxiang Univ, Coll Chem & Chem Engn, Xinxiang 453003, Peoples R China;[2]Capital Normal Univ, Dept Chem, Beijing 100048, Peoples R China

第一机构：新乡学院化学化工学院

通讯机构：[1]corresponding author), Xinxiang Univ, Coll Chem & Chem Engn, Xinxiang 453003, Peoples R China.|[110713]新乡学院化学化工学院;[11071]新乡学院;

年份：2019

卷号：186

期号：1

外文期刊名：MICROCHIMICA ACTA

收录：;Scopus(收录号：2-s2.0-85058784187);WOS:【SCI-EXPANDED(收录号:WOS:000453931800006)】；

基金：This study was supported by Science and Technology Innovation Funds of Xinxiang University (Grant No. 15ZP05) and Science Technology Open Cooperation Program of Henan Province of China (Grant No. 182106000029).

语种：英文

外文关键词：Cadmium ion; Gold nanoparticle aggregation; Glutathione; Microscopy; Lake water; Yellow and red dots; Ratiometric detection

摘要：A colorimetric approach is presented for the determinaton of cadmium(II) using unmodified gold nanoparticles (AuNPs) as a colorimetric probe. The assay is based on AuNP aggregation that is induced by the complexes formed between Cd(II) and glutathione (GSH) in a concentrated solution of NaCl. Unmodified AuNPs are known to aggregate in high-salt medium, but GSH can prevent aggregation. In the presence of Cd(II), it will bind GSH, and this will cause the AuNPs to aggregate as indicated by yellow and red dots under dark-field microscopy observation and the formation of a blue coloration. By monitoring the intensity change of AuNPs (as a ratio of absorbances at600 and 520nm), Cd(II) can be quantified with a linear response in the 17 pM to 16.7nM concentration range and a detection limit of 4.3 pM. The method was successfully applied to the determination of Cd(II) in spiked lake water by the standard addition mode, and the detection limit is 4.5 pM.