TITLE

Fluorescence-detecting cationic surfactants using luminescent CdTe quantum dots as probes

AUTHOR(S)
Xue-Lian Diao; Yun-Sheng Xia; Tian-Long Zhang; Yan Li; Chang-Qing Zhu
PUB. DATE
July 2007
SOURCE
Analytical & Bioanalytical Chemistry;Jul2007, Vol. 388 Issue 5/6, p1191
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
A novel fluorescence quenching method for the determination of cationic surfactants (CS), specifically cetyltrimethylammonium bromide (CTAB), dodecyltrimethylammonium bromide (DTAB), and cetylpyridinium chloride (CPC), has been developed using water-soluble luminescent CdTe quantum dots (QDs) modified with thioglycolic acid (TGA). The possible interference from heavy and transition metals (HTM) has been efficiently eliminated through simple sample treatment with mercapto cotton made in-house. Under optimum conditions, the extent of fluorescence quenching of CdTe QDs is linearly proportional to the concentration of CS from 2.0 × 10−7 to 7.0 × 10−6 mol L−1 with a detection limit of 5.0 × 10−8 mol L−1. The relative standard deviation for 1.0 × 10−6 mol L−1 CTAB is 2.5% ( n = 6). The proposed method exhibits high sensitivity and selectivity and furthermore avoided the use of toxic organic solvents and tedious solvent extraction procedures. It has been applied to the determination of trace CS in natural river water and commodity samples with satisfactory results. [Figure not available: see fulltext.]
ACCESSION #
25603371

 

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