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江湾红树林湿地土壤重金属含量分析及污染评价
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作者单位
罗松英,梁绮霞,邢雯淋,梁艺琼,邓子艺,刘显兰 岭南师范学院地理系 
基金项目:国家自然科学基金项目(41606053);广东省教育厅青年创新人才项目(2018KQNCX152)
中文摘要:采用电感耦合等离子体发射光谱仪(ICP-AES)和电感耦合等离子体质谱仪(ICP-MS)对湛江湾红树林湿地土壤中8种重金属(As、Cu、Cd、Cr、Hg、Ni、Pb、Zn)含量进行测定,采用单因子污染指数法、内梅罗综合污染指数法和地累积指数法进行污染评价,并结合相关性分析和因子分析方法探讨重金属来源。结果表明:除Ni外,其余7种重金属元素含量平均值均未超过国家土壤环境质量标准(GB15618-2018);但Ni、Zn、Cu、Hg、As和Cd元素均超过广东砖红壤环境背景值,其中As、Ni、Hg和Zn元素超标情况严重。8种重金属元素内梅罗综合污染指数评价结果为0373~22576,平均值为3378,整体处于重度污染;单因子污染指数依次为Ni>Hg>Zn>Cd>As>Cu>Pb>Cr。单个重金属元素地累积指数评价结果与内梅罗综合污染评价相一致,均显示红树林土壤中Hg、Zn和Ni元素污染严重,是影响研究区土壤环境质量的重要因素。从站位看,位于湾内北部的北涯村、观海长廊以及西部的世乔村站位污染较严重,高污染站位约占总站位数的33%,主要为Cd、Hg和Zn。统计分析结果显示,除Ni外,湛江湾红树林土壤中7种重金属元素之间显著相关;结合实地调查结果推测重金属污染主要来自工业污染、船舶排污、养殖排污、生活排污及农业面源污染等人为活动的输入,其次为自然因子的输入。
中文关键词:电感耦合等离子体发射光谱仪(ICP-AES)  电感耦合等离子体质谱仪(ICP-MS)  红树林  重金属  污染评价
 
Analysis and Pollution Assessment of Heavy Metals Contents in Soil of Mangrove Wetlands at Zhanjiang Bay
Abstract:Inductively coupled plasma emission spectrometer(ICP-AES) and inductively coupled plasma mass spectrometer(ICP-MS) were used to determine the contents of eight heavy metals,ie.As,Cu,Cd,Cr,Hg,Ni,Pb and Zn in the soil of mangrove wetland at Zhanjiang Bay.Single factor index,Nemerow index and geoaccumulation index were used for pollution assessment.The sources of heavy metals were investigated by correlation analysis and factor analysis.The results obtained are as follows:Except for Ni,the average mass fractions for the other seven heavy metals do not exceed the national soil environmental quality standard(GB15618-2018),but Ni,Zn,Cu,Hg,As and Cd exceed the environmental background values for Guangdong latosol,while As,Ni,Hg and Zn exceed the national environmental standard seriously.The Nemerow indexes for eight heavy metals range from 0373 to 22576,with an average of 3378,which means a serious pollution state.The single factor pollution indexes for eight heavy metals in turn are ranked as follows:Ni>Hg>Zn>Cd>As>Cu>Pb>Cr.The evaluation results of geoaccumulative indexes are consistent with those of Nemerow indexes,indicating that Hg,Zn and Ni are important factors affecting soil environmental quality in the study area.Viewing from the stations,the stations of Beiyacun and Guanhaichanglang in the north of the Bay,and Shiqiaocun in the west are serious polluted,about 33% of the total number of stations mainly attribute to Cd,Hg and Zn pollution.Statistical analysis results showed that,except for Ni,there are significant correlations among As,Cu,Cd,Cr,Hg,Pb and Zn,while the correlation between Ni and other elements is not significant.Based on the field survey results,it is inferred that the heavy metal pollutions mainly derive from the input of human activities,such as industrial pollution,ship sewage,aquaculture sewage,domestic sewage,and agricultural non-point source pollution,next from the input of natural factors.
Key Words:inductively coupled plasma emission