Determination of Free Chlorine with Spectrophotometric Method Using N,N-diethyl-1,4-Phenylenediamine
XU Xiao-jie, LIN bin, CHEN Yu-qing
State Key Lab of Modern Optical Instrumentation, Department of Optical Engineering,Chinese National Engineering & Technology Research Centre for Optical Instrument,Zhejiang University,Hangzhou 310027, China
Abstract:In this paper, the absorption spectra of free chlorine in the visible region has been measured after free chlorine in the solution had reacted with N,N-diethyl-1,4-phenylenediamine(DPD). The relation between the absorption spectra and peak wavelength has been discussed. From the experiment of liquor with different concentration, the error of spectral measurement is less than 0.04%. By nonlinear data fitting, the relation between the concentration of free chlorine and the transmittivity has been given.
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