Distribution of heavy metals in soils of Port Harcourt and its environs,Niger Delta,Nigeria   总被引：1，自引：0，他引：1  

Minapuye I Odigi  Lucky O. Ukren  Hycienth O. Nwankwoala 《中国地球化学学报》2011,30(4):415-421

Geochemical evaluation of the distribution of heavy metals in soils of Port Harcourt and its environs in the Niger Delta region is presented in respect of anthropogenic factor and index of geoaccumulation. Sixteen (16) soil samples were collected from two horizons (0-10 cm and 100 cm) from the various grids and analyzed. The geo-chemical analyses showed the vertical and horizontal distributions of heavy metals. The results showed the ranges of the metals determined as follows: Pb (6.86-2.49)×10-6, with an average of 4.63×10-6; Cd (0.05-0.00)×10-6, with an average of 0.02×10-6, As (0.01-0.00)×10-6, with an average of 0.00×10-6. Cu (15.36-10.80) ×10-6, with an average of 13.36×10-6, and V (1.36-0.20)×10-6, with an average of 0.94×10-6. Quantification of the degree of pollution was carried out using anthropogenic factor (AF) and index of geoaccumulation (Igeo). The Igeo values of 0.06, 0.02 and 0.00 for Pb, Cd and As, respectively indicate low-level contamination while Zn (1.14) and V (1.40) show me-dium-level contamination. The sources of contamination are attributed to urbanized anthropogenic activities. The majority of the samples analyzed show that the AF values are less than 1 with the exception of vanadium (V) whose AF values range from 2.73 to 13.60×10-6. Vanadium is more enriched than As, Cd, Pb, and Cu. The order of degrees of anthropogenic contamination and index of geoaccumulation in the soil is V >Zn >Pb >Cu >Cd >AS. Metals were retained near the top soil and their concentrations in the deepest horizons were lower and normal for uncontaminated soils. Metal concentrations in the top soil horizons were significantly related to distance from the industrial and hu-man activities.  相似文献   

Human Health Risk Assessment Model of Organic Pollution in Groundwater: Shijiazhuang Industrial Zone     

YANG Mei  FEI Yuhong  JU Yiwen  and LI Huaqi 《《地质学报》英文版》2011,85(6):1508-1517

In this study, a risk-based management model is developed and applied to an industrial zone. The models proposed by the United States Environmental Protection Agency and Han Bing have been improved by adding a residual ratio of volatile organic compounds (VOC) after boiling and deleting the related parameters in half-life. Using this improved model, an integrated process was used to assess human health risk level in the study area. Compared with water quality analysis, the results highlight the importance of applying an integrated approach for decision making on risk levels and water protection. The results of this study demonstrated that: (1) Compared with these permissible level standards in China (GB 3838-2002) and National Primary Drinking Water Regulations of the United States, the residents’ daily life had not been affected by the groundwater in this area (except for relative bad water quality of HB3-4 and HB3-6); (2) The typical detected organic contaminants of all groundwater samples were chloroform, carbon tetrachloride, trichloroethylene and tetrachloroethene, and the pollution sources were mainly industrial sources by preliminary investigations; (3) As for groundwater, the non-carcinogenic risk values of all samples do not exceed the permissible level of 1.0 and the carcinogenic risk values are relatively lower than the permissible level of 1.00E-06 to 1.00E-04; (4) Drinking water pathway of trichloroethylene and tetrachloroethylene mainly contribute to increasing the health risk of residents’ in study areas; (5) In terms of non-carcinogenic risk and carcinogenic risk, the health risk order for drinking water pathway and dermal contact pathway was: drinking water pathway > dermal contact pathway.  相似文献   

内江市双桥乡土壤重金属含量及风险评价   总被引：3，自引：0，他引：3  

黄蕾  王鹃  彭培好  王珏玮 《物探化探计算技术》2011,33(4):450-454,349,350

以四川省内江市双桥乡为研究区域,调查分析各类土壤中重金属（Cu、Pb、Zn、Cd、Cr、As、Hg、Ni）含量情况。采用单因子污染指数、内梅罗综合污染指数和富集因子评价方法,对土壤重金属污染状况进行评价。研究结果表明,该地区Cd、Cr、Cu、Ni、Pb、Zn元素平均含量高于成都经济区、四川省、中国土壤背景值,有一定程度的Cd、Cr、Cu、Ni、Pb、Zn富集,Hg元素有个别样点含量偏高,并且单因子重金属的污染程度依次为：Cd〉Ni〉Zn〉Cu〉Cr〉Pb〉As〉Hg,Cd在绝大部份区域存在轻微污染,由内梅罗污染指数和富集因子评价得出区域综合污染程度为轻度。  相似文献   

黔东南那哥铜、铅多金属矿床构造地球化学特征及矿质来源初探     

杨德智  周家喜  王劲松  陈昌平  丁伟  刘永坤  杨捷 《矿产与地质》2011,25(2):131-137,167

那哥铜、铅多金属矿床构造控制明显,矿体产于近东西向的F2断层中;地层中成矿元素含量Cu等低,而构造破碎带内及那哥辉绿岩体Cu、Pb等含量高;地层、构造及岩体的As、Zn等含量基本相同;地层、构造、岩体微量元素对比及硫铅同位素显示,成矿元素可能来自深部幔源.综合研究认为其成因类型可能归为岩浆热液矿床,构造起到至关重要作用...  相似文献   

蒙古国巴颜乌列盖多兰哈达地区地球化学特征及成矿     

孙增战  何强民 《陕西地质》2011,29(1):98-104

蒙古国巴颜乌列盖多兰哈达位于世界著名的铜—金—铅锌—钨金属成矿区—阿尔泰多金属成矿带北西段。区内出露地层主要为泥盆纪火山—沉积岩系。地球化学异常呈环带状分布,与岩体关系密切,该区铅锌矿为受火山通道控制的火山热液型金—铅锌矿床。矿区西部有寻找深部富矿体的前景,矿区南部及矿区东部次火山斑岩体附近,有寻找深部盲矿体的潜力。  相似文献   

多模型方法在非点源污染负荷中的应用展望   总被引：2，自引：0，他引：2  

王慧亮  李叙勇  解莹 《水科学进展》2011,22(5):727-732

对非点源污染进行定量化和有效控制的方法是通过非点源污染负荷模型对各类非点源的形成、迁移转化以及负荷量进行模拟。然而,流域非点源污染模型的不确定性是单一模型模拟污染负荷面临的重大挑战。借鉴多模型方法在降低水文模型不确定性方面的优越性,通过分析水文模型与非点源污染模型的相通性,提出多模型方法在非点源污染负荷中应用的基本思路并分析了多模型方法在非点源污染负荷估算中面临的挑战,总结了多模型方法在非点源污染负荷应用中的重点和难点问题。  相似文献   

泉州城市表层土壤重金属的赋存形态及污染评价   总被引：3，自引：0，他引：3  

林燕萍  胡恭任  于瑞莲  张雪琴 《矿物岩石》2011,31(2)

本文采用改进的BCR连续提取法研究泉州市区表层土壤中17种重金属的形态分布特征,并运用地积累指数Igeo法、潜在生态危害指数法、次生相与原生相分布比值法(RSP)评价土壤中重金属元素的潜在生态危害。结果表明,Li,Ti,Fe,Sc,V,As,Sb,Sn主要以残渣态存在;Cr,Ni,Cu,Zn,Bi在可氧化态中占有大比例,但仍以残渣态为主;Pb以可还原态为主;Mn,Cd,Co在可还原态和残渣态中占有较大比例。根据地累积指数法和RSP,泉州土壤受到不同程度的Sc,Co,Ni,Cu,Cd,Sb,Pb污染;潜在生态危害指数表明泉州市城区受到轻微生态危害。  相似文献   

吉林省三所城市电磁辐射监测结果统计分析与评价   总被引：1，自引：0，他引：1  

高彦伟  王笑晗  张静 《世界地质》2011,30(3):435-438

以城市环境电磁污染为研究对象,根据吉林省长春、延吉、四平环境综合电场强度监测数据．利用统计学方法和指数评价法进行统计分析和评价,计算了三所城市的电磁污染评价指数和污染风险概率,并对环境电磁辐射容量进行了估算。结果表明：目前三所城市环境电磁辐射电场强度监测值具有不同的概率分布,辐射强度低于中国电磁辐射安全标准,污染风险概率为0。如果电磁辐射能量以年均14％的速度递增,长春、延吉、四平将分别在19年、16年和18年后电磁辐射水平超过电磁环境保护限值,因此应该加强城市环境电磁辐射的管理和防控。  相似文献   

川西坳陷中段中侏罗统沙溪庙组储层砂岩物源分析   总被引：2，自引：0，他引：2  

安红艳  时志强  张慧娟  曾德勇  张华 《四川地质学报》2011,31(1):29-33

川西坳陷中段中侏罗统沙溪庙组是重要的含气层.沙溪庙组储层砂岩以岩屑长石砂岩、长石岩屑砂岩为主,具有明显的沉积相分异.龙门山前和川西坳陷内砂岩的碎屑组分存在明显的差异,前者具有"贫长石,高石英"的特征,后者则"富长石、低石英",前者成分成熟度高于后者.根据研究区地层斜层理对沙溪庙组岩层古水流综合分析表明,古水流方向以北西...  相似文献   

模糊因子分析在地下水污染评估中的应用——以河南省洛阳市为例   总被引：3，自引：0，他引：3  

马荣  石建省 《地球学报》2011,32(5):611-622

传统的多元统计法难以定量化表征不同污染源对单个样本点的影响,本文引入了一种新的方法——模糊因子分析法.将该方法应用于洛阳市地下水污染来源解析研究,通过模糊聚类和因子分析对研究区样品进行分类,探明主要的污染源类型及其对整个研究区和单个样品点的污染贡献率.计算结果表明:洛阳市浅层地下水主要有以下四个污染源:基岩风化、加工制...  相似文献