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污水中微量汞的富集-控制酸度解吸测定法 被引量:1
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作者 杨媛媛 尹颖 +3 位作者 王玮玮 谭礼梅 霍永琴 储成顶 《安徽医科大学学报》 CAS 北大核心 2006年第4期481-483,共3页
目的建立巯基棉-富集酸度控制解吸法,以检测污水中微量汞含量。方法污染水样以巯基棉吸附富集,控制酸度实现干扰物和汞的分步解吸,再以罗丹明B法测定之紫外测定波长为532nm。结果方法的线性良好,水样的最小检出为0.0007mg/L;回收率为97... 目的建立巯基棉-富集酸度控制解吸法,以检测污水中微量汞含量。方法污染水样以巯基棉吸附富集,控制酸度实现干扰物和汞的分步解吸,再以罗丹明B法测定之紫外测定波长为532nm。结果方法的线性良好,水样的最小检出为0.0007mg/L;回收率为97.5%、98.1%,RSD为4.2%,测定结果与现行国标方法无显著性差异。结论该方法及所采用的富集技术是测定低浓度水样汞的又一选择有较好的实用性。 展开更多
关键词 汞/分析 分光光度法 紫外线 污水/分析
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松花江汞污染综合治理后环境汞含量及其对儿童神经行为功能的影响
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作者 叶琳 李静 +5 位作者 王春华 隋春生 金明华 邹晓妮 韩正学 李娟 《吉林大学学报(医学版)》 CAS CSCD 北大核心 2004年第4期631-633,共3页
目的 :了解松花江汞污染源综合治理后儿童神经行为功能的情况。方法 :以松花江汞污染综合治理后地区为观察组 ,长春郊区非汞污染区为对照组 ,测定两组环境中的汞含量 ;并采用 WHO推荐的神经行为核心测试组合 (NCTB) ,对 12 7名观察组儿... 目的 :了解松花江汞污染源综合治理后儿童神经行为功能的情况。方法 :以松花江汞污染综合治理后地区为观察组 ,长春郊区非汞污染区为对照组 ,测定两组环境中的汞含量 ;并采用 WHO推荐的神经行为核心测试组合 (NCTB) ,对 12 7名观察组儿童和 15 6名对照组儿童进行神经行为功能测试。结果 :两组江水、土壤和鱼体中汞含量差异无显著性 (P>0 .0 5 ) ,观察组粮食汞含量显著高于对照组 (P<0 .0 5 ) ,但均低于国家标准。观察组儿童神经行为功能得分与对照组之间差异无显著性 (P>0 .0 5 ) ,仅观察组儿童目标瞄准与追踪测验的错误得分显著高于对照组 (P<0 .0 1)。结论 :松花江汞污染源的综合治理已取得较好的成效 ,对儿童的神经行为功能没有产生明显影响。 展开更多
关键词 汞/副作用 汞/分析 神经行为学表现 儿童
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Impacting Factors of Elemental Mercury Re-emission across a Lab-scale Simulated Scrubber 被引量:11
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作者 武成利 曹晏 +1 位作者 董众兵 潘伟平 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2010年第3期523-528,共6页
Elemental mercury(Hg^0)re-emissions from slurries and solutions were evaluated in a lab-scale simulated scrubber.Oxidized mercury(Hg^2 +)standard solution was injected into the simulated scrubber at a desired rat... Elemental mercury(Hg^0)re-emissions from slurries and solutions were evaluated in a lab-scale simulated scrubber.Oxidized mercury(Hg^2 +)standard solution was injected into the simulated scrubber at a desired rate to simulate absorbing and dissolving of Hg^2 +in the flue gas across wet flue gas desulfurization(WFGD)systems. PS analytical mercury analyzer was used to continuously determine Hg0re-emission concentrations in the carrier gas from the scrubber.Sulfite ion in the slurry of CaSO3 was validated to reduce Hg ^2+to Hg^ 0,while no Hg ^0 re-emission occurred from slurries of CaSO4 and CaO.Transitional metal ions with low chemical valence such as Fe^2 +,Pb ^2+,Ni ^2+, AsO2^-and Cu ^+were used to prepare solutions with concentration levels of mmol·L^-1.Reduction reaction of Hg^2 +to Hg 0was observed from these solutions.Reduction capabilities for the different transitional metal ions in the solutions were:Pb^2 +〉Cu ^+〉Fe^ 2+〉 AsO2^-〉Ni ^2+. 展开更多
关键词 simulated scrubber elemental mercur-y re-emission impacting factors SULFITE transitional metal ions
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TOTAL AND METHYL MERCURY LEVELS IN HUMAN SCALP HAIRS
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作者 柴之芳 丰伟悦 +4 位作者 钱琴芳 关铭 李新继 陆毅伦 张秀梅 《Nuclear Science and Techniques》 SCIE CAS CSCD 1994年第2期65-70,共6页
The contents of total and methyl mercury in scalp hair samples of 1179 fishermenliving at a typical Hg-polluted region in Northeast China and 27 lying-in womenand their new born babies in Beijing have been determined ... The contents of total and methyl mercury in scalp hair samples of 1179 fishermenliving at a typical Hg-polluted region in Northeast China and 27 lying-in womenand their new born babies in Beijing have been determined by illstrumental neutronactivation analysis, gas chromatography (electron coupling) and other techniqlles.Only 18 of all fishermen have the Hg contents above 5 ig/g, which indicates that theHg pollution there has been substantially alleviated. The longitudinal Hg patternsof the lying-in women show a gradually lowering tendency during pregnant period.Further, the Hg contents of the new-born babies are generally above or close to those oftheir mothers, confirming the mechanism that the methyl Hg, an organic species of Hgwith high toxicity, is readily able to penetrate the placental barrier and accumulatedin fetus. Thus, the mercury poison hajs occurred at the early stage of pregnancy. 展开更多
关键词 Chemical species of mercury Total Hg Methyl Hg Neutron activation analysis Gas chromatography Human hair Hg pollution
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Effect of Mercury on the Proximate Composition of Maize (Zea mays L,)
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作者 Nathaniel Owusu Boadi Harry Okyere +2 位作者 Mercy Badu John Kenneth Mensah Idah Owusu-Appiah 《Journal of Agricultural Science and Technology(B)》 2013年第7期487-492,共6页
Plants can be exposed to mercury either by direct administration as antifungal agents, mainly to crop plants through seed treatment or foliar spray, or by accident. Mercury poisoning has become a problem of interest o... Plants can be exposed to mercury either by direct administration as antifungal agents, mainly to crop plants through seed treatment or foliar spray, or by accident. Mercury poisoning has become a problem of interest on a global scale. Natural emissions of mercury form two-thirds of the input; man-made releases form about one-third. Significant amounts of mercury may be added to agricultural land with sludge, fertilizers, lime and manures. Total mercury levels were determined in six breeds of quality protein maize using cold vapor atomic absorption spectrometry (CVAAS). The breeds analyzed were Aziga, Abeleehi, Akposoe, Golden Jubilee, Etubi and Obaatanpa. Proximate composition of these breeds was also determined. The objective of this study was therefore to assess the effect of mercury on the proximate composition of quality protein maize. The proximate composition of the maize varieties analyzed showed that the moisture content ranged from 11.57% ± 0.205% to 12.76%± 0.042%, ash from 1.11% ±0.064% to 1.58% ±0.021%, protein, 6.51%± 0.307% to 10.39% ±0.306%, fiber 1.44% ±0.071% to 1.87% ± 0.057%, fat 1.84% ± 0.078% to 2.75% ± 0.092% and carbohydrate 71.77% ± 0.035% to 76.54% ± 0.216%. The total mercury levels in the maize breeds analyzed ranged from 0.0010 + 1.17E-05μg/g to 0.0079 + 1.00E-05μg/g. The mercury levels detected were lower than the WHO limit for mercury in food of 0.5 μg/g in all the maize breeds. The low levels of mercury in the maize samples show they are safe for consumption. 展开更多
关键词 MERCURY TOXICITY MAIZE proximate composition CVAAS
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