PACKTEST 化学需氧量

COD is an abbreviation for Chemical Oxygen Demand. There are various methods for measuring COD, that differ in oxidizing agent, reaction time, and reaction temperature; and each method has different oxidizing ratio depending on the type and concentration volume of oxidizable substances. In Japan, standard procedure for using the potassium permanganate method (COD-Mn) indicated in JIS K 0102 17. carried out in acidic medium for 30 min in water bath (100℃) is generally used, but PACKTEST COD utilizes JIS K 0102 19. using the alkaline medium (COD-OH) for presenting the advantage of fast and simple method. Alkaline medium method for JIS, the amount of potassium permanganate consumed in a boiling water bath for 20 min is determined by titration. On the other hand, PACKTEST COD determines the value by change of colors which potassium permanganate is consumed at ordinary temperature. The standard protocol uses glucose for standard solution. Water from the river may have good correlation with official COD-Mn method, but most of the oil, detergents, and other solids do not. When using PACKTEST for wastewater, please check correlation with official method, like JIS in Japan, for better reading.