土壤硒和重金属元素分布规律及污染评价--以陕西紫阳为例  

Distribution and pollution assessment of selenium and heavy metals in soil:Ziyang,Shaanxi Province as an example

作　　者：侯晨晖 冯彩霞[1] 刘燊[1] 赵慧博 HOU Chenhui;FENG Caixia;LIU Shen;ZHAO Huibo(Department of Geology/State Key Laboratory of Continental Dynamics,Northwest University,Xi′an 710069,China)

机构地区：[1]西北大学地质学系/大陆动力学国家重点实验室,陕西西安710069

出　　处：《西北大学学报（自然科学版）》2022年第5期878-890,共13页Journal of Northwest University（Natural Science Edition）

基　　金：陕西省自然科学基金(2020JM-423)。

摘　　要：为系统查明陕西省紫阳县土壤中硒(Se)及其他重金属元素的富集程度及规律,对紫阳毛坝镇、双安镇、瓦庙镇和白鹤口—双庙梁地区的表层土壤开展了系统研究,通过土壤中微量元素测定,在重金属元素含量及其分布程度和规律把握的基础上,对其重金属污染及土壤元素富集情况进行探讨。研究结果表明,4个采样点土壤中Se均具有超常富集特征,且以闹热地区最为显著;同时,紫阳地区土壤中重金属污染情况十分严峻,多数重金属元素(如Mo,W,Cd)均具有不同程度的富集性,而Mo和W污染在所有地区均明显存在,W的富集因子达到了背景值的数百倍。在紫阳地区,按污染水平由高到低可排序为闹热、白鹤口-双庙梁、毛坝、瓦庙。研究后认为,紫阳地区重金属污染(如Mo与Pb,Ba和V)来源与当地广泛分布的下寒武统黑色岩系存在密切联系,而黑色岩系中的石煤是其重要来源。To systematically find out the enrichment degree and law of selenium(Se)and other heavy metal elements in the soil of Ziyang County,Shaanxi Province,with the help of element geochemical means,this study carried out a systematic study on the surface soil of Maoba,Shuangan,Wamiao and Baihekou-shuangmiaoliang in Ziyang County.Through the determination of trace elements in soil,on the basis of grasping the content,distribution degree and law of heavy metal elements,the heavy metal pollution and soil element enrichment were discussed.The results show that Se in the soils of the four sampling points has the characteristics of extraordinary enrichment,and the most significant is in the Naore area;at the same time,the heavy metal pollution in the soil of Ziyang Area is very serious.Most heavy metal elements(such as Mo,W and Cd)have different degrees of enrichment.For example,Mo and W pollution are obvious in all areas,and the enrichment factor of W reaches hundreds of times of the background value.In Ziyang Area,according to the pollution level from high to low,it is Naore>Baihekou-shuangmiaoliang>Maoba>Wamiao.Systematic data investigation and research show that the sources of heavy metal pollution(such as Mo,Pb,Ba and V)in Ziyang Area are closely related to the widely distributed Lower Cambrian black rock series,and the stone coal mixed in the black rock series is an important source.

关 键 词：土壤 重金属元素 硒 地球化学 紫阳 

分 类 号：P595[天文地球—地球化学]