摘要
本文研究了各种条件下Cr(Ⅲ)和Cr(Ⅵ)在经甲醛处理的茶叶上的捕集行为。用这种处理茶作捕集剂分离测定了废水中的Cr(Ⅲ)和Cr(Ⅵ),其结果与离子交换树脂法基本一致。
In this paper, a method was described for separating Cr(Ⅲ) from Cr(Ⅳ) in water with tea. The tea was treated with formalin, Cr(Ⅲ) is collected over 98% in the solution of 0.01 mol/L sodium acetate at pH 6, but Cr(Ⅳ) almost can't be collected. The tea can be reused over several times as the adsorbent,after Cr(Ⅲ) is washed away with 1.0mol/L HCl,SO_4^(2+),Cl^-,and NO_3^- of the lower concentration (0.01mol/L) did not effect the collection efficiency of Cr(Ⅲ). Addition of HPO_4^(2-), EDTA, citrate, tartrate and oxalate leads to the collection lower 80%. The separaticn of Cr(Ⅲ) and Cr(Ⅵ) was compared between tea and ion-extraction. The experiment shows that the results are almost the same with the two methods. This improves that the method of separating Cr(Ⅲ) from Cr(Ⅵ) with tea is reliable in water.
出处
《分析化学》
SCIE
EI
CAS
CSCD
北大核心
1991年第2期175-177,共3页
Chinese Journal of Analytical Chemistry
