Resonance Scattering Spectral Determination of Trace Chlorine in Water Using Cationic SurfactantsReport as inadecuate




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In acidic sodium acetate-HCl buffer solution containing KI, chlorine may oxidize I- to form I2, and then I2 reacts with excess I- to I3 -, which combines with cationic surfactans including tetradecyldimethyl benzylammonium chlorideTDMBA, tetradecylpyridinium bromideTPB, cetyltrimethylammonium bromide CTMAB and tetrabutylammonium iodideTBAI, respectively, to form association particles, which give resonance scatteringRS effect at 467 nm. The RS intensity at 467 nm of the TDMBA, TPB, CTMAB and TBAI association particles systems is linear to chlorine concentration over the range of 0.008~ 1.24μg-mL, 0.029~1.79μg-mL, 0.083~2.22μg-mL and 0.091~3.06μg-mL Cl2, respectively, with detection limits of 0.0032μg -mL, 0.0081μg -mL, 0.073μg- mL and 0.012μg -mL Cl2, respectively. Based on this, a new, simple and sensitive analysis method for the determination of chlorine in water was developed. In the four systems, the TDMBA system possesses good stability and high sensitivity. The proposed method has been applied to the analysis of chlorine in water, with satisfactory results which is in agreement with that of the methyl orange MO spectrophotometry.

KEYWORDS

chlorine; cathionic surfactants; association particles; resonance scattering

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Author: Weiming Mo, Caiyan Kang

Source: http://www.scirp.org/



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