Related Experiment Video
Updated: Aug 19, 2026

Microwave-assisted Intramolecular Dehydrogenative Diels-Alder Reactions for the Synthesis of Functionalized Naphthalenes/Solvatochromic Dyes
Published on: April 1, 2013
[Determination of free chlorine with spectrophotometric method using N,N-diethyl-1,4-phenylenediamine]
Xiao-jie Xu1, Bin Lin, Yu-qing Chen
1State 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.
Related Concept Videos
Precipitation Titration: Endpoint Detection Methods
In the Volhard method, a standard excess of AgNO3 is first added to the...
Flame Photometry: Lab
Gas Chromatography: Types of Detectors-II
Hydrolysis of Chlorobenzene to Phenol: Dow Process
Diazonium Group Substitution: –OH and –H

