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71.
72.
以万山汞矿区土壤为研究对象,采用电感耦合等离子体质谱仪和原子荧光光谱仪测定土壤中的重金属含量,分别运用内梅罗综合污染指数(NPI)法和潜在生态风险指数(RI)法评价土壤重金属污染和潜在生态风险,并应用相关性分析、主成分分析和聚类分析对土壤重金属来源进行分析。结果表明:土壤Hg、Cd、As、Pb、Cu、Ni和Zn出现不同程度累积,分别达贵州省背景值的263.61、2.31、1.28、2.11、1.70、1.01和3.52倍;土壤重金属平均NPI为188.00,属于严重污染水平,Hg是主要污染因子;土壤重金属平均RI为10 655.70,属于极强潜在生态风险水平,Hg是主要潜在生态风险因子;土壤中Cu、Ni、Cr主要源于自然活动,As、Pb、Zn主要源于燃煤和交通运输污染,Cd主要源于农业污染,Hg主要源于汞冶炼污染。 相似文献
73.
Effect of oxidation treatment on the adsorption and the stability of mercury on activated carbon 总被引:1,自引:0,他引:1
HU Chang-xing ZHOU Jin-song LUO Zhong-yang HE Sheng WANG Guang-kai CEN Ke-fa 《环境科学学报(英文版)》2006,18(6):1161-1166
Oxidation treatment on the adsorption and the stability of Hg on activated carbon (AC) was inrestigated. Both MnO2-AC and FeCl3-AC were produced during oxidation treatment. The measurement of modified AC's mercury adsorption capacity was conducted in a simulated coal-fired flue gas by adsorbing test apparatus. TCLP and column leaching methods were used to test the stability of mercury adsorbed on ACs. The results indicate that the oxidation treatment changed the pore structure of the AC and modified the carbon surface by creating chemical components such as MnO4^-, Mn^4+, O, NO^3-, Fe^3+, Cl^-, etc. The Hg sorption capacity on MnO2-AC or FeCl3-AC was about three times higher than that of untreated carbon. In addition, the mercury control cost of each of the formers was about the half cost of the untreated carbon. The stability of Hg absorption was studied, it found that mercury adsorbed on the oxidation treated AC was not better than that of untreated carbon. It could concluded that the insoluble form of Hg is very important to the stability of mercury adsorbed on AC. This study suggests that the FeCl3-AC is the best absorbent for Hg with high adsorption capacity, better Hg adsorption stability in leaching environment, and lower cost among the three ACs tested. 相似文献
74.
75.
One century sedimentary records of polycyclic aromatic hydrocarbons, mercury and trace elements in the Qinghai Lake, Tibetan Plateau 总被引:2,自引:0,他引:2
Xiaoping Wang Handong Yang Xin Zhao Simon Turner 《Environmental pollution (Barking, Essex : 1987)》2010,158(10):3065-3070
Sediments from a remote lake of northeastern Tibetan Plateau were analyzed for polycyclic aromatic hydrocarbons (PAHs) and trace metals. USEPA priority PAHs, ranged from 11 in 1860 to 279 ng g−1 in 2002, while, the deposition fluxes were in the range of 0.2-11.4 ng cm−2 yr−1. Similarly, from 1860 to 2002, an increased trend of Hg flux was observed (0.5-3.2 ng cm−2 yr−1). Remarkable increase of PAHs and Hg concentration began from 1970, nearly the same period of the “Reform and Open” Policy had been embarked (1978) in China. Good correlations were found between concentrations of Pb, Zn, Cd, As, Hg, and PAHs, which suggested the sources of these chemicals in the sediment is analogous, likely from anthroprogenic sources. Based on isomer ratios, PAHs in core were dominantly from the incomplete combustion of coal. Owing to the proximity to dust source area (Qaidam Basin) and the close association between PAHs, Hg, Pb, and particle matters, atmospheric dust-transport and deposition might be the main pathways that pollutants enter into Qinghai Lake. 相似文献
76.
本文介绍了在环境监测中,经试验研究,确定的用阳极溶出伏安法,连续分析环境样品中重金属Cu,Pb,Cd的最佳条件,即用悬汞电极做工作电极,用0.1M离氯酸做支持电解质,纯氮除氧。当PH值取2-7,富集电位数-1.1~-1.2V时,不但可连续测定一定浓度范围的重金属Cd,Pb,CU;而且方法灵敏度高,精密良好,线性相关关系可达0.9990,回收率达85-115%,获得了良好的分析效果。 相似文献
77.
V. Gopal S. Parvathy P. R. Balasubramanian 《Environmental monitoring and assessment》1997,48(2):117-124
Cyprinus carpio were exposed to two non-essential (Hg and Pb)and two essential (Cu and Ni) heavy metal salts at lethal andsub-lethal concentrations. Blood serum total protein, serum globulinand serum albumin was analysed every 2 hr for 24 hrs andagain at 48 and 72 hrs. Serum protein and globulin level showedan intial sharp increase from 2 to 20 hrs, followed by decline thatextend over a period of 72 hrs. Serum albumin showed an initialimmediate decline from 2 to 4 hrs, followed by an intermittent period of recovery and decline that extend over a period of 72hrs. Both lethal and sub-lethal concentrations of metal salts elicited asimilar pattern of response varying only in magnitude. The use offish blood serum protein, albumin and globulin measurements as general indicators of pollutant stress response isdiscussed. 相似文献
78.
活性焦对水中汞的吸附性能 总被引:2,自引:0,他引:2
采用活性焦作为吸附剂,通过静态吸附实验,研究了活性焦对水中汞的吸附特性,并初步探讨了其吸附机理。活性焦对汞的吸附可用拟二级动力学模型描述;在pH为5时能达到对Hg(Ⅱ)的最大吸附容量,在不同离子强度下均能保证对Hg(Ⅱ)有较高的去除率;据Langmuir吸附等温线模型计算出活性焦对Hg(Ⅱ)的饱和吸附容量可达412.1 mg/g。结合红外光谱、Zeta电位测试的结果,可推测活性焦对Hg的吸附过程是物理吸附和化学吸附综合作用的结果。活性焦是一种成本低、效果显著且稳定的吸附剂,有望在含汞废水处理中发挥重要作用。 相似文献
79.
全球大气汞排放清单研究现状 总被引:3,自引:0,他引:3
综述了全球大气汞排放清单研究现状,结果表明,2010年全球排放汞约1 960 t,其中东亚和东南亚地区约占39.7%,在排放来源方面黄金生产和煤炭燃烧分别占37%和24%。介绍了美国、英国和日本的汞大气排放清单,指出中国在汞排放研究方面与发达国家之间还有差距,建议建立详细的汞排放清单,准确掌握汞的使用和排放现状。 相似文献
80.
García-Esquinas E Pérez-Gómez B Fernández MA Pérez-Meixeira AM Gil E de Paz C Iriso A Sanz JC Astray J Cisneros M de Santos A Asensio A García-Sagredo JM García JF Vioque J Pollán M López-Abente G González MJ Martínez M Bohigas PA Pastor R Aragonés N 《Chemosphere》2011,85(2):268-276