摘要
通过调查及室内模拟实验,研究了水体Fe(Ⅱ)—Cr(Ⅵ)系统中,铬的形态转化条件和Cr(OH)_3沉淀的pH范围。结果表明,在水体Fe(Ⅱ)—Cr(Ⅵ)系统中,要使Cr(Ⅵ)绝大部分转化为Cr(Ⅲ),必须控制溶液的pH≤3.5,Fe/Cr(摩尔比)位于7.0—10.0之间;为使Cr(Ⅲ)全部转化为Cr(OH)_3沉淀,pH应保持在7.5—8.5之间较好,但不得高于9.0,低于5.6。
Through a field investigation and model experiment, the chemical conditions for Cr conversion into Cr(Ⅲ) and the pH range for the precipitation of Cr(OH)_3 in the Fe-Cr water system were studied. The results showed that the pH≤3.5 and the Fe/Cr ratios(mole ratios) 7.0～10.0 were need for most of Cr converted into Cr(Ⅲ). For all Cr(Ⅲ) precipitated as Cr(OH)_3, the pH values of the solutions would be best to controlled between 7.5 and 8.5, not higher than 9.0 and lower than 5.6.
出处
《农业环境保护》
CSCD
1991年第2期56-59,共4页
Agro-Environmental Protection
