干旱区生态环境知识资源中心(Arid): 干旱区灰钙土和风沙土对Zn的吸附与解吸特性

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	干旱区灰钙土和风沙土对Zn的吸附与解吸特性
其他题名	Sorption and desorption of zinc in the sandificational and sierozem soil in the arid regions
	李虎 1; 贺婧 2; 刘冲 1; 武文飞 1; 李洋 2; 南忠仁1
来源期刊	环境化学
ISSN	0254-6108
出版年	2015
卷号	34 期号:4 页码:779-785
中文摘要	以自然土壤灰钙土和风沙土作为试验供试土壤,研究了Zn在两种土壤样品中的吸附-解吸特性. 结果表明:(1)当平衡液中Zn浓度较低时,土壤对Zn的吸附量随浓度的增加而增加,但增加速度较慢;平衡液中Zn浓度继续增加时,吸附量增加速率变大(曲线斜率逐渐增大),由于灰钙土有机质、碳酸钙、pH等高于风沙土,所以灰钙土对Zn的吸附量大于风沙土;(2)在实验设定的浓度范围内,Langmuir模型、Freundlich模型对实验数据的拟合线性相关均极显著,但总体来看Freundlich型吸附等温线方程适合描述土壤对Zn吸附过程;(3)两种土壤的高碳酸钙及有机质含量导致土壤吸附的Zn不容易被解吸,所以两种土壤的解吸量都很少,且灰钙土pH(8.65)大于风沙土(8.17),则风沙土解吸量大于灰钙土,土壤吸附Zn的解吸率与土壤Zn吸附能力呈反比,Zn在风沙土中的解吸率比灰钙土大,所以Zn在沙土的迁移和扩散的风险比灰钙土大,二次函数最为适合模拟土壤中Zn的吸附量与解吸量之间的关系,且随着Zn吸附量的增大,两种土壤对重金属Zn的解吸率均呈现出先增大后减小的趋势.
英文摘要	A batch experiment was conducted to study the characteristics of the sorption and desorption of Zn in sandy soil and sierozem in the arid regions. The results indicated that:(1) The adsorption amount increased slowly with the promotion of concentration of Znat low equilibrium concentrations. With the addiction of Zn in the solution,the growth rate of the adsorption amount increased. The higher organic matter,calcium,pH,etc. was the reason of higher adsorption amount of sierozem soil compared with sandy soil. (2) Within the presume scale,the adsorption isotherms of Zn in the two tested soils could be described by the Langmuir and Freundlich equations which shows extremely significant linear relationship with the test data,especially the Freundlich equation was fitted best. (3) The desorption rate is inversely proportional to the ability of adsorption of soil. Zn is difficult to be desorbed because of the high content of calcium carbonate and organic matter in two soils,which lead to the low desorption. The desorption amount of sandy soil is more than sierozem because of the lower pH in sandy soil. Therefore,there is higher risk of migration and proliferation of the Zn in the sandy soil compared with sierozem. The relationship between the amount of adsorption and desorption of Zn in soil could be simulated by the quadratic function. With the increase of adsorption amount,the rate of desorption in the two soil increased firstly and then decreased.
中文关键词	灰钙土 ; 风沙土 ; 吸附 ; 解吸
英文关键词	Zn sandificational soil sierozem soil zinc adsorption desorption
语种	中文
国家	中国
收录类别	CSCD
WOS类目	ENVIRONMENTAL SCIENCES
WOS研究方向	Environmental Sciences & Ecology
CSCD记录号	CSCD:5402837
来源机构	兰州大学 ; 宁夏大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/232901
作者单位	1.兰州大学资源环境学院, 兰州, 甘肃 730000, 中国; 2.宁夏大学资源环境学院, 银川, 宁夏 750021, 中国
推荐引用方式 GB/T 7714	李虎,贺婧,刘冲,等. 干旱区灰钙土和风沙土对Zn的吸附与解吸特性[J]. 兰州大学, 宁夏大学,2015,34(4):779-785.
APA	李虎,贺婧,刘冲,武文飞,李洋,&南忠仁.(2015).干旱区灰钙土和风沙土对Zn的吸附与解吸特性.环境化学,34(4),779-785.
MLA	李虎,et al."干旱区灰钙土和风沙土对Zn的吸附与解吸特性".环境化学 34.4(2015):779-785.