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A New Nanocatalytic Spectrophotometric Assay for Cationic Surfactant Using Phosphomolybdic Acid‐Formic Acid‐Nanogold as Indicator Reaction
Author(s) -
Jiang Zhiliang,
Qin Huimin,
Liang Aihui
Publication year - 2012
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.201100061
Subject(s) - chemistry , phosphomolybdic acid , cationic polymerization , ammonium bromide , catalysis , bromothymol blue , pulmonary surfactant , nuclear chemistry , formic acid , ammonium chloride , absorption (acoustics) , inorganic chemistry , chloride , chromatography , organic chemistry , biochemistry , physics , acoustics
Abstract In the pH 7.4 Na 2 HPO 4 ‐NaH 2 PO 4 buffer solution, the cationic surfactant (CS) interacted with nanogold particles (NG) to form NG aggregations (NGA) that resulted in its color changing from wine red to blue‐violet. NG has a strong catalysis on the formic acid‐phosphomolybdic acid (PMo) colored reaction, but that of the NGA catalysis is weak. With the increase of CS concentration, the NGA increased and the NG decreased, the catalysis decreased and the absorption value at 700 nm decreased linearly. The concentrations of 6.25–250 nmol/L tetradecyl dimethyl benzyl ammonium chloride (TDBAC), 0.625–250 nmol/L cetyltrimethyl ammonium bromide (CTMAB) and 12.5–500 nmol·L −1 dodecyldimethylbenzyl ammonium chloride (DDBAC) had good linear responses to the decreased absorption value (Δ A 700 nm ), with molar absorption coefficients of 2.2×10 6 , 2.1×10 6 and 9×10 5 L·mol −1 ·cm −1 respectively. This method was simple, highly sensitive and low‐cost.