高等学校化学学报2017，Vol.38Issue(12)：2289-2295,7.DOI:10.7503/cjcu20170191
结冰过程对溶解性有机质典型组分还原Cr(Ⅵ)的影响
Influences of Freezing on the Reduction of Cr(Ⅵ) by Typical Components of Dissolved Organic Matter
摘要
Abstract
The influences of freezing on the reduction of Cr( Ⅵ) by four typical components of dissolved organic matter(DOM), namely oxalic acid, tartaric acid, malic acid and citric acid, were investigated. The results show that under the condition of a low concentration in the experiments, Cr ( Ⅵ) in the aqueous solution cannot be reduced by those four organic acids. However, in the ice, the four organic acids all facili-tate to remove Cr(Ⅵ). Moreover, the removing effects gradually strengthens with the increasing concentration of organic acids. And the effects of these four organic acids rank as oxalic acid>tartaric acid>malic acid>citric acid. The concentration of inorganic salts and inorganic acid can inhibit the reduction of Cr(Ⅵ) by changing the thickness of liquid-like layers in the ice surface, but the inhibiting effect is independent of the kinds of inorganic salts. It is the initial pH of the solution and the structure of the organic acid that greatly influence the reduction of Cr(Ⅵ). Upon the experiment condition, the concentration factor of the freeze-concentration effect can reach 103 at least, which apparently facilitates the oxalic acid to remove Cr(Ⅵ) in the ice.关键词
Cr(Ⅵ)/还原/冰/溶解性有机质Key words
Cr(Ⅵ)/Reduction/Ice/Dissolved organic matter分类
化学化工引用本文复制引用
钟宇博,康春莉,王月琪,许晓雷,包思琪,薛洪海,田涛..结冰过程对溶解性有机质典型组分还原Cr(Ⅵ)的影响[J].高等学校化学学报,2017,38(12):2289-2295,7.基金项目
国家自然科学基金(批准号: 41073063, 41403101)资助. Supported by the National Natural Science Foundation of China(Nos.41073063, 41403101). （批准号: 41073063, 41403101）
