簡易分析法による工場排水，環境水のｐＨ，ＣＯＤの測定

Abstract

Simple methods for pH and COD measurements of waste and natural waters by use of commercially available pH indicator papers (Universal Test Papers, roll type, Advantec Toyo, Tokyo) and reagent packs for pH and COD measurements (PACK TEST WAK-pH, and WAK-COD, Kyoritsurikagaku, Tokyo) have been compared with the official methods, i.e., the glass electrode method for pH measurement and the potassium permanganate method for COD measurement.pH of waste, river, ground, and rain waters were measured by the official method, the pH test paper, and Ion Selective PACK TEST. The pH values obtained with PACK TEST were in good agreement with those by the official method. On the other hand, the test paper showed a tendency to give the higher pH values for the acidic samples and the lower values for the alkaline samples than the official method.The COD values of river waters were measured by PACK TEST and the official method. The values obtained by these methods were correlated with each other and the regression curve is as follows :y=0.71x-1.17 (r=0.912, n=35)were x represents the values measured by the official method and y the values measured by PACK TEST. The COD values of waste waters obtained by PACK TEST were also correlated with those by the official method, except the samples which contain much SS.When PACK TEST COD was calibrated by using synthetic domestic waste waters instead of glucose standard solutions, it gave the more similar COD values to those obtained by the official method for river and domestic waste waters.