Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10560129 | Talanta | 2011 | 5 Pages |
Abstract
The interaction between mercaptoacetic acid (MA)-capped CdTe QDs, MA-capped CdTe/ZnS QDs or glutathione (GSH)-capped CdTe QDs with As(III) was studied using fluorescence spectrometry. As (III) has a high-affinity to reduced-GSH to form As(SG)3, and the emission of the GSH-capped CdTe QDs (λem. = 612 nm) is quenched effectively. Thus, a novel fluorescence spectrometric method was developed for As (III) determination by using GSH-CdTe QDs. Under optimal conditions, the quenched fluorescence intensity (F0/F) increased linearly with the concentration of As (III) ranging from 5.0 Ã 10â6 to 25 Ã 10â5 mol Lâ1. The limit of detection (3Ï) for As (III) was found to be 2 Ã 10â8 mol Lâ1. This method is potentially useful in visual detection of As (III) under irradiation of the ultraviolet light.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Xianxiang Wang, Yi Lv, Xiandeng Hou,