河流底泥中六价铬释放规律初步研究  

Preliminary Study on Release Rule of Cr^(6+) from River Sediments

作　　者：汪玉娟[1] 吕文英[1] 刘国光[1] 黄锦勇[1] 

机构地区：[1]广东工业大学环境科学与工程学院,广东广州510006

出　　处：《安徽农业科学》2009年第2期792-794,共3页Journal of Anhui Agricultural Sciences

基　　金：广东省自然科学基金(6021477);广东省科技计划(2006B36801002)

摘　　要：[目的]研究河流底泥中Cr6+的释放规律。[方法]以北江底泥为研究对象,通过模拟环境条件的改变,研究了水体中各因素的改变对河流底泥样品中Cr6+释放量的影响。[结果]随着温度的提高,底泥样品中Cr6+的析出量逐渐增加。随着pH值的增大,Cr6+的析出量逐渐减少,当pH值大于8时,Cr6+的析出量有较小幅度的增加。随着NaC l溶液浓度的增加,Cr6+的析出量有较大幅度增加,当NaC l的浓度大于2 g/L时,Cr6+的析出量出现下滑现象。Cr6+的释放量随着酸雨成分中阳离子浓度的升高而逐渐增加,随着阴离子浓度的升高,Cr6+的释放量达到一个峰值后逐渐减少。[结论]该研究为探讨河流底泥中Cr6+的二次污染问题提供了依据。[ Objective ] The aim was to study the release rule of the Cr^6＋ from the river sediments. [ Method ] With the sediment from Beijiang River as the studying object, the effects of the change of each factor from water on the releasing amount of Cr^6＋ from the fiver sediment samples were studied through simulating the change of the environmental conditions. [ Result ] The amount of precipitates of Cr^6＋ from the sediment samples increased gradually with the increasing of the temperature and that decreased gradually with the increment of the pH value. When the pH value was above 8, the amount of precipitates of Cr^6＋ increased in a smaller range. The amount of precipitates of Cr^6＋ increased in a larger range with the increment of the cohen, of NaCl solution and when the eonen, of NaCl was above 2 g/L, the amount of precipitates of Cr^6＋ showed slide phenomenon. The releasing amount of Cr^6＋ increased gradually with the increment of the eoncn, of positive ion in the acid rain and reached a peak value and then decreased gradually with the increment of the conen, of negative ion. [ Conclusion]The research provided the basis for discussing the problem of the secondary pollution of Cr^6＋ from the river sediments.

关 键 词：底泥 Cr6+ 释放量 

分 类 号：X132[环境科学与工程—环境科学]