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the behavior of e lements —— lead

the behavior of e lements —— lead. SPEAKER: Joy XU GROUP: Trace Metal. contents. Introduction of Lead Biotoxicity The Biogeochemical Behavior . Introduction. basic information about lead. Lead , chemical symbol is Pb (Latin Plumbum ), atomic number is 82 .

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the behavior of e lements —— lead

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  1. the behavior of elements——lead SPEAKER: Joy XU GROUP: Trace Metal

  2. contents • Introduction of Lead • Biotoxicity • The Biogeochemical Behavior

  3. Introduction basic information about lead • Lead ,chemical symbol is Pb (Latin Plumbum), atomic number is 82. • Primordial Stable Isotope : ONLY 204Pb(1%) • Radioactive Isotopes: 210Pb(t1/2=22years) 212Pb(t1/2=10h)214Pb (t1/2=26.8 min) • Radiogenic Isotopes: • 238U 206Pb(24%) • 235U 207Pb (23%) • 232Th 208Pb(52%) 8α5β 7α4β 6α4β Michael Komárek(2008)

  4. Introduction The element properties • Lead (Pb) is a non-essential and toxic metal • Individual sources of Pb greater than natural sources • Over the past 5000 years, anthropogenic lead has been introduced into the global environment primarily through atmospheric transport

  5. Toxicity Biotoxicity • RBC & Skeleton & Nervous system & Hair 贫 血 骨 骼 惊 奇 铅干扰很多重要激素 铅替代钙等重要金属元素扮演“毒性信使”的角色 82

  6. The Biogeochemical Behavior ——History of Pb Emissions Atmospheric The Banning of Pb Additives In Developing Countries Increasing Pb-containing Gasoline Additives Combustion of Pb-containing Coal Mining and Smelting of Ores 1970s 1850s 1920s The Industrial Revolution Anthropogenic Pb

  7. The Biogeochemical Behavior ——Anthropogenic Sources

  8. The Biogeochemical Behavior ——Diffusion Process

  9. The Biogeochemical Behavior 多以大气沉降进入水体 环境输入和沿食物链传递 随径流输入

  10. Summary 铅元素研究思路： 环境污染研究：铅元素含量 污染源示踪：铅同位素比值 沉积年代反演：放射性同位素衰变 研究方向： 环境污染情况研究 生物样品污染源示踪 某物种生命行为示踪

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