自然科学版
陕西师范大学学报(自然科学版)
资源与环境科学
渭河(杨凌—兴平段)表层沉积物中重金属的粒径分布特征及污染评价
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翟萌,卢新卫*,黄丽,王利军,雷凯
(陕西师范大学 旅游与环境学院, 陕西 西安 710062)
翟萌,男,硕士研究生,研究方向为环境污染与修复. E-mail: zhaimengtt@163.com.* 通信作者:卢新卫,男,教授,博士研究生导师.E-mail: luxinwei@snnu.edu.cn.
摘要:
在对渭河(杨凌—兴平段)表层沉积物粒度组成分析的基础上,用X-Ray荧光光谱法研究了不同粒径表层沉积物中重金属元素Cu、Pb、Ni、Mn、Cr、Co的含量及分布规律,并用富集因子法评价了不同粒径沉积物中重金属的富集污染状况.结果表明:渭河表层沉积物粒径主要分布在<75 μm 的范围内,重金属元素Cr在粒径<75 μm 的沉积物中具有较强富集现象,Cu、Pb、Ni、Mn、Co的浓度峰值均出现在150~300 μm的沉积物颗粒中.富集因子评价结果表明:Cr、Cu、Mn、Pb、Ni在不同粒径的富集因子均小于2,基本未受污染;Co 的富集因子普遍在2~3之间,最大值为584,显示出一定的污染趋势.
关键词:
渭河; 沉积物; 重金属; 粒径
收稿日期:
2009-10-15
中图分类号:
X522
文献标识码:
A
文章编号:
1672-4291(2010)04-0094-05
基金项目:
教育部新世纪优秀人才支持计划基金资助项目(NCET-05-0861)
Doi:
Particle size distribution and pollution assessment of heavy metals in the surface sediment from Yangling to Xingping reach of the Wei River
ZHAI Meng, LU Xin-wei*, HUANG Li, WANG Li-jun, LEI Kai
(College of Tourism and Environment, Shaanxi Normal University, Xi′an 710062, Shaanxi, China)
Abstract:
On the basis of analyzing particle size composition of the surface sediments from Yangling to Xingping reach of the Wei River, heavy metal content and distribution in the surface sediment of different particle size were studied by using X-Ray fluorescence spectrometry. The enrichment and contamination levels of heavy metals were assessed in the different size of surface sediments based on the enrichment factor method. The results showed that the surface sediments of the Wei River are mainly distributed in
KeyWords:
Wei River; sediment; heavy metal; particle size