【摘要】 讨论了在pH=9.4～10.0的氨性溶液中,利用Fe3+与Te4+、Bi3+生成三元共沉淀物,分离其它杂质,然后用KOH溶解Te,从而达到Te,Bi分离的目的。在pH=1.5～1.7的溶液中,利用抗坏血酸掩蔽铁,以硫脲-PAR作为指示剂,用EDTA标准溶液滴定Bi。当n=6时,相对标准偏差为0.4%,回收率为98.53%～102.2%,方法准确、可靠。更多还原

【Abstract】 Fe3+,Te4+ and Bi3+ can form a ternary complex precipitate in ammonia containing solution at pH=9.4～10.0,so by the precipitation reaction,other impurity elements in Bi-Te slag can be separated from the slag sample.Then the ternary complex was dissolved using KOH and Te4+ was released into the solution,whereas Bi was not.By this means,Te and Bi was separated.At pH=1.5～1.7,using ascorbic acid to mask iron ion and thiourea-PAR as indicator,Bi3+ was titrated by EDTA standard solutions.The standard deviation is 0.071(n=6) and the standard addition recoveries are 98.5%～102.2%.The method is accurate and reliable.更多还原