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Controls of Dissolved Organic Matter and Chloride on Mercury Uptake by a Marine Diatom

机译:溶解性有机物和氯化物对海洋硅藻吸收汞的控制

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摘要

The effects of natural dissolved organic carbon (DOC) from different origins (estuarine, coastal, and diatom decomposed! and chloride (Cl) on the uptake of inorganic mercury [Hg(II)] and methylated mercury(MeHg) by the marine diatom Thalassiosira pseudonana was investigated using radiotracer techniques. We first developed a new method to remove the surface adsorbed mercury and quantified the intracellular mercury uptake by the diatoms. The dominant mercury species (DOC or chloride complexes, based on the mercury speciation phase diagrams) was controlled by the concentrations of DOC and Cr, which could explain the effects of DOC and Cl" on mercury uptake. DOC complexes dominated Hg(II)'s speciation and reduced its uptake in most seawater examined. DOC complexes dominated MeHg's speciation only at relatively high DOC levels (>100 μM), but it could affect MeHg uptake even when MeHg-Cl complexes dominated. In a mercury-DOC complex dominated system, both the origin and quantity of DOC greatly influenced mercury uptake by the diatoms. Although DOC generally inhibited the uptake of Hg(II) or MeHg, DOC resulting from diatom decomposition enhanced Hg(II) uptake. Under conditions dominated by chloride complexation, neutral mercury chloride species (HgCl_2 or MeHgCl) may control the uptake.
机译:不同来源(河口,沿海和硅藻分解的)天然溶解有机碳(DOC)和氯化物(Cl)对海洋硅藻Thalasiosira吸收无机汞[Hg(II)]和甲基化汞(MeHg)的影响用放射性示踪技术研究了假单胞菌,我们首先开发了一种去除表面吸附的汞并量化硅藻对细胞内汞吸收的新方法,主要的汞种类(基于汞形态相图的DOC或氯化物络合物)受到控制。 DOC和Cr的浓度,这可以解释DOC和Cl“对汞吸收的影响。DOC配合物主要控制Hg(II)的形态,并减少了大多数海水中的吸收。DOC配合物仅在相对较高的DOC时控制了MeHg的形态。浓度(> 100μM),但即使以MeHg-Cl络合物为主,也可能影响MeHg的吸收在汞-DOC络合物为主的系统中,DOC的来源和数量都很大硅藻对汞吸收的影响。尽管DOC通常会抑制Hg(II)或MeHg的吸收,但是硅藻分解产生的DOC会提高Hg(II)的吸收。在以氯化物络合为主导的条件下,中性氯化汞物质(HgCl_2或MeHgCl)可以控制吸收。

著录项

  • 来源
    《Environmental Science & Technology》 |2009年第23期|8998-9003|共6页
  • 作者

    HUAN ZHONG; WEN-XIONG WANG;

  • 作者单位

    Department of Biology, The Hong Kong University of Science and Technology (HKUST), Clear Water Bay, Kowloon, Hong Kong;

    Department of Biology, The Hong Kong University of Science and Technology (HKUST), Clear Water Bay, Kowloon, Hong Kong;

  • 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
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