秦岭北麓矿区周边农田土壤重金属污染及风险评价  

Pollution and evaluation of heavy metals in farmland soils around mining area of the northern foot of Qinling mountains

作　　者：孙晓寅 孙永昌 王婷婷[1,2] 曹书苗 白露[1,2] 韩操惠 SUN Xiaoyin;SUN Yongchang;WANG Tingting;CAO Shumiao;BAI Lu;HAN Caohui(School of Water and Environment,Chang'an University,Xi'an 710054,China;不详)

机构地区：[1]长安大学水利与环境学院,西安710054 [2]长安大学旱区地下水文与生态效应教育部重点实验室,西安710054 [3]西安建筑科技大学陕西省环境工程重点实验室,西安710055

出　　处：《工业安全与环保》2022年第8期87-92,共6页Industrial Safety and Environmental Protection

基　　金：国家自然科学基金(41702367);陕西省团省委秦岭生态科学考察项目(2020-3)。

摘　　要：针对秦岭北麓潼关县矿区周边土壤污染进行现场调查、样品采集及样品中Zn、Cu、Pb、Cd、Cr等5种重金属元素含量分析,为矿区周边土壤重金属污染防治提供科学依据。采用单项污染指数法、内梅罗综合污染指数法、地质累积指数法和潜在生态危害指数法对土壤重金属污染进行了综合分析与污染风险评价。秦岭北麓潼关县矿区周边土壤重金属污染较严重,其中Cd、Pb污染明显,土壤污染潜在生态危害处于重度危害程度。以农用地土壤污染筛选值为标准,计算得到Zn、Cu、Pb、Cd的累积超标率分别为10.53%、52.63%、94.74%、100%,Cr含量未超标。不同重金属的污染程度由强至弱顺序为:Cd>Pb>Cu>Zn>Cr,各种重金属的潜在生态危害强度由强至弱顺序为:Cd>Pb>Cu>Zn>Cr,其中,Cd污染占绝对主导地位。潼关县矿区周边土壤重金属潜在生态危害较强,对周边土壤环境构成威胁,矿区环境污染治理迫在眉睫。The site investigation,sample collection and analysis of the content of five he avy metals,Zn,Cu,Pb,Cd and Cr in the samples were conducted for soil pollution around the mining area in Tongguan County at the northern foot of Qinling Mountains to provide a scientific basis for the prevention and control of heavy metal pollution in the soil around the mining area. Soil quality was assessed with the single pollution index,Nemerow comprehensive pollution index,geoaccumulation index and potential ecological risk index. Heavy metal pollution in the soil around the mining area of Tongguan County in the northern foot of the Qinling Mountains was relatively serious. Among them,the pollution of Cd and Pb was obvious,and the potential ecological risk was at a severe level. Taking agricultural land soil pollution screening values as the standard,the cumulative over-standard rates of Zn,Cu,Pb and Cd were10.53%,52.63%,94.74% and 100%,respectively. Cr content did not exceed the standard. The pollution degree of different heavy metals is in the order of Cd>Pb>Cu>Zn>Cr;the potential ecological risk intensity of various heavy metals is in order of Cd>Pb>Cu>Zn>Cr. Among them,Cd pollution is absolutely dominant. The potential ecological risk of heavy metals in the soil surrounding the mining area in Tongguan County were relatively high,posing a threat to the surrounding soil environment. Therefore,the environmental pollution control in the mining area was urgent.

关 键 词：土壤污染 重金属 地质累积指数 潜在生态危害 污染评价 

分 类 号：X53[环境科学与工程—环境工程] X820.4