期刊
MICROCHIMICA ACTA
卷 183, 期 2, 页码 827-836出版社
SPRINGER WIEN
DOI: 10.1007/s00604-015-1689-z
关键词
Colorimetric probe; Tatrate capping; TEM; Aggregation; Environmental analysis
资金
- Department of Science Technology, New Delhi [SB/FT/CS-128/2012]
We report on a simple, rapid and sensitive colorimetric assay for the quantitation of cationic surfactants (CS+) in domestic effluent, municipal waste and surface water samples. The method is based on the aggregation of tartrate-capped gold nanoparticles (AuNPs) through both electrostatic and hydrophobic interactions that occur between CS+ and AuNPs. Aggregation results in a color change from pink to blue which is due to a shift in the localized surface plasmon resonance band. The detergent cetylpyridinium chloride (CPC) was chosen as a model compound for optimization of the method for determination of a CS+. Under optimized experimental conditions (pH 9.0; reaction time 5 min; 25 nM concentration of AuNPs), a linear calibration plot was obtained for quantitative determination of CPC, cetyltrimethylammonium bromide (CTAB), dodecyltrimethyl ammonium bromide (DTAB) in the range of 10-500, 10-200 and 10-300 ngmL(-1), respectively and the limit of detection was 3 ngmL(-1) for CPC, CTAB and DTAB.
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