关键词: 硝酸银, 电位滴定, 预处理, 污水, 氯化物

Abstract: When measuring the chloride content of refining wastewater at SINOPEC Anqing Company using volumetric determination with mercury nitrate, end point error seemed to affect the accuracy of test results. Measures, such as improving wastewater sample pretreatment and using potentiometric titration with silver nitrate to replace manual indicator method, were adopted. Since then the recovery rate of Cl- ions reached 99.0%~102.0%, the minimum detection limit was 1.8×10-5 mol/L and the test results of this method were in good agreement with the results of determination by ion chromatography. This method is suitable for determining chloride content of wastewater in refinery and also other concerning environmental wastewater.

Key words: silver Nitrate, potentiometric titration, pretreatment, wastewater, chloride