EDTA络合滴定法测定硫酸铜废液中的铝

EDTA complexometric titration for determination of aluminum in copper sulfate waste solution

实验研究了冶金工艺过程产生的硫酸铜废液中铝的测定方法。采用氨水（1＋1）使铝以氢氧化铝沉淀的形式与主体溶液分离，然后用EDTA络合法测定铝的质量浓度；对该硫酸铜废液中铜、铁干扰离子、溶液的酸度、EDTA络合反应温度等条件进行了一系列的实验，解决了硫酸铜废液中铝的测定难题。该方法与分光光度法比较，简单快速，分析成本低廉；通过对不同硫酸铜废液中铝的质量浓度测定，相对标准偏差为0．071％～0．930％（n＝6），样品测定值与络天青S分光光度法测定值相符合。

Copper sulfate waste solution generated in metallurgical process is studied in determining aluminum . Ammonia （1＋1） is used to separate aluminum in the form of aluminum hydroxide precipitation from the principal part of the solution ,and then the aluminum mass concentration is determined by EDTA complexometry .A series of ex-periments are conducted on the parameters such as copper and iron ionic interference ,solution acidity and the temper-ature of the EDTA complexation reaction ,solving the problems of the determination of the aluminum in this copper sul-fate waste solution .This method compared with spectrophotometry is simple , rapid and has lower analysis cost .The method through the determination in copper sulfate solution with different mass fraction ,obtains a relative standard de-viation of 0.071 %-0.930 %（n=6）,and sample measurements are consistent with the azure S value determined by spectrophotometry .