摘要
为了解三峡库区消落区紫色土对重金属的吸附特点,采用振荡平衡方法研究石灰性、中性和酸性3种紫色土对Pb2+、Cu2+、Zn2+和Cd2+的吸附特征,并比较不同环境条件对紫色土吸附重金属的影响。结果表明:(1)一定pH条件下,同种土壤对4种重金属离子的吸附能力依次为Pb2+>Cu2+>Cd2+≈Zn2+;(2)在一定pH条件下,石灰性紫色土、中性紫色土、酸性紫色土对同种重金属离子的吸附强度依次降低,与其表面电荷密度的大小相一致;(3)石灰性紫色土、中性紫色土和酸性紫色土表面对Pb2+和Cu2+的吸附以静电和专性方式共存,其中对Pb2+的专性吸附比例分别约为56%、67%和50%;而对Zn2+和Cd2+绝大多数情况下产生静电吸附。
In order to understand heavy metal （ including Pb^2＋ , Cu^2＋ , Zn^2＋ , Cd^2＋ ） adsorption characteristics of purple soil in the water-level-fluctuating zone of the Three-Gorge reservoir region, an experiment was carried out to study heavy metal adsorption behavior of acidic, neutral and calcareous purplish soils under different conditions with the batch sorption method. Results show that（ 1 ）with a certain pH, a soil adsorbed heavy metals with strength varying in the order of Pb^2＋ 〉 Cu^2＋ 〉 Cd^2＋ ≈ Zn^2＋ ;（2） with a certain pH, the three soils absorbed the same heavy metal with strength in the order of calcareous purplish soils 〉 neutral 〉 acidic, which is in line with the order in surface charge density ; （ 3 ） Pb^2＋ and Cu^2＋ adsorption on the surface of the three soils existed in both static and specific patterns. The specific pattern accounted for 56% ,67% and 50% respectively,in the case of Pb^2＋. Static pattern was in dominancy in the case of Zn^2＋ and Cd^2＋.
出处
《生态与农村环境学报》
CAS
CSCD
北大核心
2007年第1期40-42,62,共4页
Journal of Ecology and Rural Environment
基金
中国科学院土壤与农业可持续发展国家重点实验室开放基金(035108)
重庆文理学院校级课题资助
关键词
重金属
吸附
紫色土
三峡库区
heavy metal
adsorption
purple soil
Three-Gorge reservoir region
