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首页> 外文期刊>Environmental toxicology and chemistry >AN ENRICHED STABLE ISOTOPE TECHNIQUE TO ESTIMATE THE AVAILABILITY OF SOIL ZINC TO LUMBRICUS TERRESTRIS (L.) ACROSS A SALINIZATION GRADIENT
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AN ENRICHED STABLE ISOTOPE TECHNIQUE TO ESTIMATE THE AVAILABILITY OF SOIL ZINC TO LUMBRICUS TERRESTRIS (L.) ACROSS A SALINIZATION GRADIENT

机译：盐化梯度过程中丰富的稳定同位素技术，用于估算土壤锌对白粉病的有效性

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摘要

An enriched stable isotope approach was developed to evaluate Zn bioavailability to Lumbricus terrestris. The decrease in 68Zn/66Zn in organ tissues was used to assess the relative magnitude of the bioavailable soil Zn pool. This tool was then used to specifically evaluate bioavailability as a function of soil cation distribution. Storm-water pond soils were modified using two treatment regimens whereby H2_O-extractable Zn was varied either by different ZnCl2 amendments or by constant ZnCl2 amendment followed by varying the soil cation distribution through salt amendments (NaCl or CaCl2). Earthworms previously equilibrated in 68Zn-spiked soil were introduced to experimental soils, and after 2 d, removed for analysis of isotopic ratios in specific tissues. Despite a wide range of H2_O-extractable Zn values produced by the salt treatments (0.007-24.3 mg/kg), a significant relationship between Zn turnover rate in earthworm tissues and H2_O-extractable Zn in the salt-treated soils was not observed. Rather, considering both treatment regimens, turnover rate better correlated with Zn present in broader pools, such as that extracted by 6M HNO3. The bioavailability of trace metals to earthworms may be poorly characterized by loosely bound fractions such as the pore water. Additionally, the turnover rate of 68Zn in anterior organ tissues may be an effective tool to evaluate the relative magnitude of the bioavailable soil Zn pool.
机译：开发了一种丰富的稳定同位素方法来评估锌对rest的生物利用度。器官组织中68Zn / 66Zn的减少用于评估生物利用土壤Zn库的相对大小。然后使用该工具专门评估生物利用度与土壤阳离子分布的关系。使用两种处理方案对雨水塘土壤进行了改性，其中通过不同的ZnCl2改性剂或恒定的ZnCl2改性剂来改变H2_O可萃取的Zn，然后通过盐改性剂（NaCl或CaCl2）改变土壤阳离子的分布。将先前在68Zn加标土壤中平衡的equi引入实验土壤，并在2天后移出，以分析特定组织中的同位素比率。尽管通过盐处理可产生广泛的H2_O可萃取的Zn值（0.007-24.3 mg / kg），但未观察到worm组织中的Zn转化率与盐处理过的土壤中H2_O可萃取的Zn之间存在显着关系。相反，考虑到两种治疗方案，周转率与更广泛的池中存在的锌更好相关，例如用6M HNO3提取的锌。痕量金属对earth的生物利用度可能无法通过松散结合的组分（例如孔隙水）来表征。此外，前器官组织中68Zn的转化率可能是评估生物有效性土壤Zn库相对量的有效工具。

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  • 来源
    《Environmental toxicology and chemistry》 |2011年第3期|p.607-615|共9页
  • 作者

    Derek W. Rodgers; Steven M. LEV; Joel W. Snodgrass; David R. Ownby; Lisa M. Prince; Ryan E. Casey;

  • 作者单位

    Urban Environmental Biogeochemistry Laboratory, Towson University, Towson, Maryland, USA;

    Urban Environmental Biogeochemistry Laboratory, Towson University, Towson, Maryland, USA;

    Urban Environmental Biogeochemistry Laboratory, Towson University, Towson, Maryland, USA;

    Urban Environmental Biogeochemistry Laboratory, Towson University, Towson, Maryland, USA;

    Earth and Environmental Sciences Department, Juniata College, Huntingdon, Pennsylvania, USA;

    Urban Environmental Biogeochemistry Laboratory, Towson University, Towson, Maryland, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    stable isotope; earthworm; zinc; bioavailability; soil;

    机译：稳定同位素蚯蚓;锌生物利用度泥;

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