摘要
本文将氧化还原滴定与配位滴定相结合 ,对铬、锆、铝多金属鞣剂中铬、锆、铝含量的连续测定进行了探讨。配制K2 Cr2 O7、Zr4 + 、Al3+ 含量已知的混合溶液 ,用碘量法测出铬含量 ;再利用Zr4 + 与Cr3+ 、Al3 + 同EDTA配合能力的差别 ,先在 pH =0 .5 - 1时滴定Zr4 + ,再在 pH =5 - 6时返滴Cr3+ 、Al3+ 总量 ,由Cr3+ 、Al3+ 总量中扣除Cr3 +
A Cr(Ⅵ)-Zr(Ⅳ)-Al(Ⅲ) standard solution was made and their amounts were consecutively determined.Cr(Ⅵ) was determined with iodometry,Zr(Ⅳ)and Al (Ⅲ)with complexometric titration by EDTA.It has been tested that the results were exact,the operations simple and convenient.
