自动电位滴定法测定氯亚钯酸溶液中的游离酸  

Determination of free acids in chloropalladium acid solution by automatic potentiometric titration

作　　者：韩媛 苏琳琳 李玲 张思 许明明 陈洪来 吴春艳 唐振艳 HAN Yuan;SU Linlin;LI Ling;ZHANG Si;XU Mingming;CHEN Honglai;WU Chunyan;TANG Zhenyan(Sino-Platinum Metals Chemical Materials(Yunnan)Co.Ltd.,State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals,Sino-Platinum Metals Co.Ltd.,Kunming 650106,China)

机构地区：[1]贵研化学材料(云南)有限公司,贵研铂业股份有限公司稀贵金属综合利用新技术国家重点实验室,昆明650106

出　　处：《贵金属》2023年第S01期119-121,共3页Precious Metals

基　　金：云南贵金属实验室产业化技术攻关项目(YPML2022050210)。

摘　　要：利用自动电位滴定仪和复合玻璃电极,建立了快速测定氯亚钯酸溶液中的游离酸的方法。结果发现,自动电位滴定法能够准确区分游离酸氢氧化钠及氯亚钯酸跟氢氧化钠反应的各自滴定终点,被测溶液p H出现两次阶梯式突跃变化,其中第一阶梯最大突跃点EP1为目标终点。测定的结果的盐酸回收率在85%~110%之间,相对标准偏差(RSD)≤2%,方法直观快速准确,适用于氯亚钯酸溶液中的游离酸测定。A rapid method for the determination of free acids in chloropalladium acid solution was developed by using an automatic potentiometric titration and composite glass electrode.The results show that the automatic potentiometric titration can accurately distinguish the end points of the reaction of free acid with sodium hydroxide and chloropalladium acid withsodium hydroxide,the maximum jump point of the first step EP1 is the target end point.The recovery of hydrochloric acid is between 85%and 110%,and the relative standard deviation(RSD)is less than 2%.The method is intuitionistic,rapid and accurate.It is suitable for the determination of free acid in chloropalladium acid solution.

关 键 词：电位滴定 氯亚钯酸 复合玻璃电极 游离酸 最大突跃点 

分 类 号：O657.77[理学—分析化学]