A Flow Injection Analyzer for Chemical Oxygen Demand Using Potassium Permanganate

Abstract

ABSTRACT An apparatus for measuring chemical oxygen demand (COD) based on the principle of flow injection analysis (FIA) is described. The apparatus is simple and inexpensive, and constructed by components such as a double plangent pump, sampling valve, flow cell, spectrophotometer and recorder, commercially available for high performance liquid chromatography. Polytetrafluoroethylene (Teflon) tubing is used for mixing coils and transmission lines. The operating conditions are determined by using glucose, as the standard COD substance. The peak heights obtained for various concentrations of aqueous glucose solutions correspond to their manual COD values obtained by JIS method.