A sensitive extracto-photometric method for determination of residual chlorine in greywater

Abstract

A new photometric method for chlorine determination based on the oxidative transformation of iodide to iodine and subsequent extraction in ethyl acetate has been developed. The effects of several chemical variables (pH, ionic strength, and iodide concentration) have been studied. Characteristics of the method were linear range 0-0.6 mg Cl2/L, limit of detection 5 μg Cl2/L, and coefficient of variation 0.6%. The method has been applied to greywater without previous sample treatment.