电位滴定测定催化剂中银的分析方法  

Determination of silver in catalyst by potentiometric titration

作　　者：张丽 陈雄飞 李岩 喻宏伟 王志鑫 ZHANG Li1,CHEN Xiong-fei1,LI Yan1,YU Hong-wei2,WANG Zhi-xin2(1.Beijing research technology group GB （Beijing） inspection and Certification Co., Ltd.,Beijing 100088,China;2. Switzerland Wantong China Co., Ltd., Beijing 100192,China)

机构地区：[1]北京有研科技集团国标(北京)检验认证有限公司,北京100088 [2]瑞士万通中国有限公司,北京100192

出　　处：《世界有色金属》2018年第6期193-193,195,共2页World Nonferrous Metals

摘　　要：研究了用电位滴定法测定催化剂中银的含量,选用728Metrohm电位滴定仪。(Metrohm AG)银电极为指示电极。在硫酸介质中连续滴定银中的氯化银。用电位滴定法判断终点的方法,比之用指示剂指示终点的方法更客观准确。特别是针对有沉淀、有色或浑浊的试样下,电位滴定能排除这些干扰因素。原有方法采用硝酸溶解银催化剂试样,在硝酸介质中会造成氯化银流失,使后续测量的数据不准确。本方法改用硫酸溶样,具有高选择性、简便快捷精准。测定范围:Ag10.00%~80.00%The content of silver in the catalyst was determined by potentiometric titration, and the 728 Metrohm potentiometric titrant was selected. The（Metrohm AG） silver electrode is an indicator electrode. A continuous titration of silver chloride in silver in a sulfuric acid medium. The method of determining the end point by potentiometric titration is more objective and accurate than the method of indicating the end point by the indicator. Especially for samples with precipitate, colored or turbidity, potential titration can exclude these interference factors. The original method uses nitric acid to dissolve the silver catalyst sample, which will cause the loss of silver chloride in the nitric acid medium, which makes the data of the follow-up measurement inaccurate. This method is modified with sulphuric acid solution, which has high selectivity, simple, quick and accurate. Determination range： Ag10.00% - 80.00%

关 键 词：电位滴定 银电极 催化剂 银 氯化银 硫酸 

分 类 号：O657.1[理学—分析化学] TQ426[理学—化学]