硫化银电极用于测定银时,唯一的阳离子干扰是汞。一般需分离除汞后测定。但在溶液中直接消除汞的干扰的办法似尚未见诸报道。本文报告在氨性介质中用EDTA为掩蔽剂消除汞对测定银的干扰。采用氯化钠—氨水—EDTA混合体系,使高浓度银在溶液中保持稳定,且氯离子不干扰。标准硝酸银溶液配 Silver sulfide electrode for the determination of silver, the only cation interference is mercury. Generally need to separate mercury measurement. However, the direct elimination of mercury in solution has not been reported. This paper reports the use of EDTA as a screening agent to eliminate the interference of mercury in the determination of silver in ammonia media. Using sodium chloride - ammonia - EDTA mixed system, the high concentration of silver in the solution remained stable, and chloride ions do not interfere. Standard silver nitrate solution with