13種のCOD値の関係と意義および塩素イオンの影響について

概要

論文の詳細を見る
COD values of the standard substances and effluent treated human excrement were determined by 13 methods and the influence of Cl^- on the COD values was investegated. The results are as follows ; 1. When KMnO_4 was used as an oxidant (KMnO_4 method), COD values of standard substances were zero or very low comparing with the values obtained by methods using K_2Cr_2O_7 as an oxidant (K_2Cr_2O_7 method). Low COD value was also obtained on the effluent of treated human excrement by KMnO_4 method. Therefore, the COD value by KMnO_4 method is meaningless as an indicater of sewage pollution. 2. By K_2Cr_2O_7 method, especially with Ag_2SO_4 as a catalyst, high COD values were obtained for almost every standard substances and effluent of treated human excrement. In this case, COD values were also obtained by the inorganic substances such as NH_3 and Cl^-. 3. KMnO_4 method was slightly affected by Cl^-, while K_2Cr_2O_7 method was greatly influenced by Cl^-. The influence of Cl^- in K_2Cr_2O_7 method can be eliminated by adding HgSO_4 to the sample.
公益社団法人日本薬学会の論文
1966-12-30