Visual detection of trace copper ions based on copper-catalyzed reaction of ascorbic acid with oxygen

被引：9

作者：

Hou, Xin Yan ^{[1
]}

Chen, Shu ^{[1
]}

Shun, Lian Ju ^{[1
]}

Zhao, Yi Ni ^{[1
]}

Zhang, Zhi Wu ^{[1
]}

Long, Yun Fei ^{[1
]}

Zhu, Li ^{[2
]}

机构：

[1] Hunan Univ Sci & Technol, Sch Chem & Chem Engn, Minist Educ, Key Lab Theoret Organ Chem & Funct Mol, Xiangtan 411201, Peoples R China

[2] Beijing Union Univ, Sch Chem & Chem Engn, Beijing 100101, Peoples R China

来源：

SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY | 2015年 / 149卷

基金：

中国国家自然科学基金;

关键词：

Triangular silver nanoplates; Copper(II) ions; Sodium thiosulfate; Visual detection; SILVER NANOPARTICLES; GOLD NANOPARTICLES; FLUORESCENT-PROBE; QUANTUM DOTS; DEPENDENCE;

D O I：

10.1016/j.saa.2015.04.032

中图分类号：

O433 [光谱学];

学科分类号：

0703 ; 070302 ;

摘要：

A visual detection method for trace Cu2+ in aqueous solutions using triangular silver nanoplates (abbreviated as TAgNPs) as the probe was developed. The method is based on that TAgNPs could be corroded in sodium thiosulfate (Na2S2O3) solutions. The absorption spectrum of TAgNPs solution changed when it is corroded by Na2S2O3. The reaction of oxygen with ascorbic acid (Vc) in the presence of a low concentration of Cu2+ generates hydrogen peroxide that reacts with Na2S2O3, which leads the concentration of Na2S2O3 in the solution to be decreased. Therefore, the reaction between TAgNPs and the reacted mixture of Na2S2O3/Vc/Cu2+ was prevented efficiently. When the Na2S2O3 concentration and reaction time are constant, the decrease in the concentration of Na2S2O3 is directly proportional to the Cu2+ concentration. Thus, morphology, color, and maximum absorption wavelength of TAgNPs changed with the change of Cu2+ concentration. The changed maximum absorption wavelength of TAgNPs (Delta lambda) is proportional to Cu2+ concentration in the range from 7.5 x 10(-9) to 5.0 x 10(-7) M with a correlation coefficient of r = 0.9956. Moreover, color change of TAgNP solution was observed clearly over a Cu2+ concentration range from 7.5 x 10(-8) to 5.0 x 10(-7) M. This method has been used to detect the Cu2+ content of a human hair sample, and the result is in agreement with that obtained by the atomic absorption spectroscopy (AAS) method. (C) 2015 Elsevier B.V. All rights reserved.

引用

页码：103 / 108

页数：6

共 38 条

[11] The role of hydrolyzed metal cations in the liquid-liquid extraction of ultrafine silica with dodecyl sulfate [J].