摘要
通过向土壤溶液中加入Ｃｕ２＋和可溶性有机碳(ＤＯＣ),研究它们之间的相互作用．结果发现,加入铜可以显著改变土壤水溶性有机碳(ＷＳＯＣ)的吸着平衡,并降低了其水溶性．影响程度在０．８ｍｍｏｌ·ｌ－１Ｃｕ以下随铜浓度的增加而增加．加入０．５ｍｍｏｌ·ｌ－１铜的土壤中 ＷＳＯＳ含量从 ０．２７ｍｇ Ｃ·ｇ－１降至０．０４７ｍｇ Ｃ·ｇ－１,吸着系数从６．６×１０－３ｌ·ｇ－１降至３．３×１０－３ｌ·ｇ－１．另一方面,用Ｆｒｅｕｎｄｌｉｃｈ方程描述铜离子在土壤中的吸附行为(液相浓度单位取ｍｍｏｌ·ｌ－１,固相浓度取ｍｍｏｌ·ｇ－１土),ｋ＝９．ｌ×１０－３;ｎ＝３．４０． 加入ＤＯＣ后,ｋ＝９．２×１０－３;ｎ＝３．６６,没有明显改变土壤对铜的吸附性能．加入小同浓度的ＤＯＣ,结果仍说明该浓度范围内ＤＯＣ(＜８ｍｇ Ｃ·ｌ－１)的加入没有明显改变土壤对铜的吸附性能．
Adsorption of copper and WSOC by soil was influenced by addition of copper or DOC. The sorption balance of WSOC was obviously changed following copper addition, especially when the concentration of copper was below 0.8 mmol ?l-1 Cu. With adding 0.5 mmol ?l-1 Cu, the content of WSOC decreased from 0.27 mgC昰-1 to 0.047 mgC昰-1, and the adsorption coefficient reduced from6.6 x 10-3 l昰-1 to 3.3 x 10-3 l昰-1. The addition of different content of DOC would not affect the sorption of copper by soil.
出处
《环境化学》
CAS
CSCD
北大核心
2001年第6期561-565,共5页
Environmental Chemistry
基金
香港中文大学联合书院访问学人计划
国家杰出青年基金(49525102)资助
