干旱区绿洲灌漠土对铜的吸附解吸特性研究  

Sorption and Desorption of Copper in Irrigated Desert Soils from Oasis Regions

作　　者：王胜利[1] 周婷[1] 南忠仁[1] 廖琴[1] 武文飞[1] 刘姣[1] 晋王强[1] 赵翠翠[1] 王斌[1] 

机构地区：[1]兰州大学西部环境教育部重点实验室,兰州730000

出　　处：《土壤》2011年第1期81-88,共8页Soils

基　　金：国家自然科学基金重点项目(NSFC91025015);国家环境保护公益性项目(NEPCP200809098);兰州大学中央高校基本科研业务费专项项目(lzujbky-2009-65)资助

摘　　要：土壤对重金属的吸附解吸是影响土壤系统中重金属的移动性和归宿的主要过程。本文使用序批实验方法、单步提取方法、连续提取方法等研究了干旱区绿洲灌漠土Cu的吸附解吸特性。结果表明,灌漠土对Cu的吸附等温线可很好地用Freundlich等温方程拟合,灌漠土的Cu吸附可能受土壤理化综合因素影响,而不仅是某个土壤理化指标所控制;二次幂函数可用于模拟灌漠土剖面不同层次土壤Cu解吸量与解吸前吸附量的关系;土壤对Cu的吸附几乎是不可逆的,阳离子交换机制不是灌漠土吸附Cu的主要机制,灌漠土吸附的Cu主要以无机态和有机态的形式存在,且无机态Cu所占百分比高于有机态。Sorption and desorption of heavy metals is one of the primary processes that affect the destination and mobility of heavy metals in soils.Laboratory batch experiments,single extraction procedure and sequential extraction procedure were conducted to study the sorption and desorption of copper（Cu） in irrigated desert soils from the oasis regions.Cu sorption behavior could be described by Freundlich equation.Cu sorption capacity in the irrigated desert soils was likely to be controlled by the combination of soil characteristics such as texture,pH,organic matter,and CaCO3 rather than a single factor.Secondary power function can be used to simulate the relationship between Cu desorption capacity and sorption capacity before desorption in the irrigated desert soils.Cu sorption was irreversible（low exchangeable fraction） in the irrigated soils.Absorbed Cu was distributed mainly in inorganic fraction and organic fraction.In general,Cu percentage in inorganic fraction was higher than that in organic fraction at the studied Cu concentration,probably because CaCO3 content and high pH in the soils from arid regions.

关 键 词：绿洲 灌漠土 铜 吸附解吸 

分 类 号：X5[环境科学与工程—环境工程]