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611.
Mercury distribution and bioaccumulation up the
soil-plant-grasshopper-spider food chain in Huludao City, China 总被引:1,自引:0,他引:1
The purpose of this study is to investigate total mercury (THg) distribution and its bioaccumulation up the soil-plant-grasshopperspider in the Huludao City, which is polluted seriously by chlor-alkali and zinc smelting industry in Northeast of China. Results indicated that average THg concentrations in soil, plant leaves, grasshopper Locusta migratoria manilensis and Acrida chinensis, and spider were 0.151, 0.119, 0.167 and 0.134 mg/kg, respectively. THg spatial distribution suggested that most of mercury came from the chlor-alkali plant and the two zinc smelteries. The highest mercury concentration was found in the wings among different grasshoppers’ organs. Although spiders are the predatory, THg concentrations in their bodies were not high, and only on the same level as in grasshoppers, which might be due to spiders’ special living habits. In the light of the mercury transportation at every stage of the soil-plant-grasshopper-spider food chain, the bioaccumulation factors were 0.03, 0.79–1.11 and 0.80–1.13 respectively. It suggested that mercury biomagnification up terrestrial food chains was not so large and obvious as it was in the aquatic food chain. 相似文献
612.
Iodine-modified calcium-based rice husk ash sorbents(I2/CaO/RHA) were synthesized and characterized by X-ray diffraction,X-ray fluorescence,and N2 isotherm adsorption/desorption.Adsorption experiments of vapor-phase elemental mercury(Hg0) were performed in a laboratory-scale fixed-bed reactor.I2/CaO/RHA performances on Hg0 adsorption were compared with those of modified Ca-based fly ash sorbents(I2/CaO/FA) and modified fly ash sorbents(I2/FA) .Effects of oxidant loading,supports,pore size distribution,iodine impregnation modes,and temperature were investigated as well to understand the mechanism in capturing Hg0.The modified sorbents exhibited reasonable effciency for Hg0 removal under simulated flue gas.The surface area,pore size distribution,and iodine impregnation modes of the sorbents did not produce a strong effect on Hg0 capture effciency,while fair correlation was observed between Hg0 uptake capacity and iodine concentration.Therefore,the content of I2 impregnated on the sorbents was identified as the most important factor influencing the capacity of these sorbents for Hg0 uptake.Increasing temperature in the range of 80-140°C caused a rise in Hg0 removal.A reaction mechanism that may explain the experimental results was presumed based on the characterizations and adsorption study. 相似文献
613.
介绍了美国俄亥俄州R.E.Burger燃煤电厂采用电催化氧化(ECO)技术控制多种污染物排放的示范项目。该ECO系统可以有效减少SO2,NOX,PM2.5,Hg的排放量,实现多污染物控制一体化,副产品可以有效利用,投资费用低,占地面积少。 相似文献
614.
615.
Effects of methyl-, phenyl-, ethylmercury and mercurychlorid on immune cells of harbor seals (Phoca vitulina) 总被引:1,自引:0,他引:1
Antje Kakuschke Elizabeth Valentine-Thon Sonja Fonfar Katharina Kramer Andreas Prange 《环境科学学报(英文版)》2009,21(12):1716-1721
Mercury (Hg) is present in the marine environment as a natural metal often enhanced through human activities. Depending on its
chemical form, Hg can cause a wide range of immunotoxic e ects. In this study, the influence of methyl-, ethyl- and phenylmercury as
well as mercurychloride on immune functions was evaluated. Two parameters of cellular immunity, proliferation and mRNA cytokine
expression of interleukin-2, -4, and transforming growth factor , were investigated in harbor seal lymphocytes after in vitro exposure
to Hg compounds. While all Hg compounds had a suppressive e ect on proliferation, di erences between juvenile and adult seals
were found. Lymphocytes from juveniles showed a higher susceptibility to the toxic e ect compared to lymphocytes from adults.
Furthermore, the degree of inhibition of proliferation varied among the four Hg compounds. The organic compounds seem to be
more immunotoxic than the inorganic compound. Finally, for the cytokine expression of methylmercury-incubated lymphocytes, timedependent
changes were observed, but no dose-dependency was found. Marine mammals of the North Sea are burdened with Hg, and
lymphocytes of harbor seals may be functionally impaired by this metal. The present in vitro study provides baseline information for
future studies on the immunotoxic e ects of Hg on cellular immunity of harbor seals. 相似文献
616.
中国煤中汞的环境行为及效应研究 总被引:2,自引:0,他引:2
针对目前学术界对汞污染研究的关注,分析归纳了国内外有关煤矿开采与利用活动中汞的环境行为与效应研究.主要结论为目前研究主要集中在煤中汞的形态及含量、燃煤汞释放特征及其环境效应等方面,而对煤炭燃烧前的环境危害、矿区汞污染特征及形成机理等方面研究较缺乏,并提出未来研究方向应着重放在矿区汞的污染特征及其形成机制、环境过程及环境效应等方面. 相似文献
617.
618.
锡矿山矿区和贵阳市人发中锑、砷和汞的污染特征 总被引:13,自引:5,他引:8
采用氢化物发生-原子荧光光谱法(HG-AFS),对经过硝酸-高氯酸消解后的锡矿山矿区和贵阳市人体头发样品中重金属锑(Sb)、砷(As)、汞(Hg)含量进行分析.结果表明,锡矿山矿区人体头发中Sb、As、Hg平均含量分别为15.9、 4.21、 1.79 μg/g,贵阳市人体头发中Sb、As、Hg平均含量分别为0.532、 0.280、 0.338 μg/g.锡矿山矿区人体头发中Sb、As、Hg含量明显高于贵阳市人体头发中相应元素的含量.通过独立样本的t检验发现,Sb、As在锡矿山矿区和贵阳市两地男性人体发样中和女性人体发样中含量不具显著差异(p>0.05);Hg在锡矿山矿区男性和女性人体头发中含量差异不显著(p>0.05),而在贵阳市则男性人体头发样品中Hg含量显著高于女性(p<0.05).人发中重金属As与Sb、As与Hg含量之间有较明显的相关性,Sb与Hg含量之间不具有显著相关性(p≤0.01).研究结果说明,锑矿开采和冶炼区域重金属Sb、As、Hg对人体健康的危害明显比非锑矿开采区域相应的重金属对人体健康的危害严重. 相似文献
619.
通过对螳螂川河流沿程相关污染源、河流水体、河流底质金属汞元素的含量、污染水平、分布状况进行深入调查、分析研究,分析河流汞污染的来源、迁移途径、环境影响,从而提出有效的防治对策。 相似文献
620.
以测定水中汞含量为例,对其在分析过程中产生的不确定度进行识别和计算,对原子荧光法测量水中总汞的不确定度加以分析评定。 相似文献