• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Marine Chemistry >Association of macroaggregates and metals in coastal waters
【24h】

Association of macroaggregates and metals in coastal waters

机译：沿海水体中的大型骨料和金属的关联

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Macroaggregates (macrogels) occurring episodically in the northern Adriatic, offer a rare opportunity to study interactions between marine organic macromolecules and metals and metalloids (Me). Macrogels are formed by agglomeration of dissolved heteropolysaccharides, mostly of phytoplankton origin. Filtration and centrifugation were used to discriminate between macrogel matrix and interstitial water colloids. The interstitial fraction was then used in an incubation experiment to follow the progress of microbial degradation of colloids. The colloids were ultraflltered through membranes and each size class of colloids (＞30 kDa, 10-30 kDa and 5-10 kDa) was analyzed for metal, metalloid, organic carbon (C_org) and total nitrogen (N_tot) content. Higher Me concentrations and lower Me/C_org ratios in matrix, which are an indicator of Me bound to organic matter, suggest that Me in a matrix can also be bound onto Me containing particles. All the studied Me in macroaggregate colloidal fraction, except Se, proved to be bound to large macromolecules (＞30 kDa), mainly glycoproteins and aminopolysaccharides. During the rapid degradation of all. except the 5-10 kDa fraction, the Me associated with the ＞30kDa fraction were markedly preserved. Consequently, the Me/C_org ratios increased due to the loss of C_org and relative increase of metal-binding sites. The observed differences between our Me/C_org ratios and the Irving-Williams series can be explained by variable background concentrations of the studied Me in the northern Adriatic. Comparison between Me levels in macroaggregate colloids and dissolved marine colloids, considered to be macroaggregate precursors, revealed similar values. Distribution coefficients (K_d) between colloidal and truly dissolved Me were lower than K_d for particulate matter, suggesting that organic colloids, including macroaggregates, exhibit rather weak Me binding capacity and that Me are not distributed homogenously in the various particle pools in the northern Adriatic coastal waters.
机译：流行于亚得里亚海北部的大聚集体（巨分子）为研究海洋有机大分子与金属和准金属（Me）之间的相互作用提供了难得的机会。大分子凝胶是通过溶解的杂多糖（主要是浮游植物来源）的附聚形成的。过滤和离心用于区分大凝胶基质和间隙水胶体。然后将间质级分用于孵育实验中，以追踪胶体微生物降解的进程。通过膜对胶体进行超滤，并分析每种尺寸的胶体（＞ 30 kDa，10-30 kDa和5-10 kDa）的金属，准金属，有机碳（C_org）和总氮（N_tot）含量。基质中较高的Me浓度和较低的Me / C_org比，这表示Me与有机物结合，这表明基质中的Me也可以与含Me的颗粒结合。除硒外，所有研究的大分子胶体级分中的我都与大分子（＞ 30 kDa）结合，主要是糖蛋白和氨基多糖。在此期间所有人迅速退化。除5-10 kDa馏分外，与> 30kDa馏分相关的Me均被显着保留。因此，由于C_org的损失和金属结合位点的相对增加，Me / C_org比增加。我们在Me / C_org比值与Irving-Williams系列之间观察到的差异可以通过在亚得里亚海北部研究的Me的背景变化浓度来解释。大颗粒胶体和溶解的海洋胶体中的Me水平之间的比较被认为是大颗粒前体，显示相似的值。胶体和真正溶解的Me之间的分配系数（K_d）低于颗粒物的K_d，这表明有机胶体（包括大聚集体）对Me的结合能力较弱，并且Me在北亚得里亚海沿岸的各种颗粒池中分布不均匀水域。

著录项

  • 来源
    《Marine Chemistry》 |2013年第20期|185-193|共9页
  • 作者

    Neza Koron; Jadran Faganeli; Ingrid Falnoga; Darja Mazej; Katja Klun; Nives Kovac;

  • 作者单位

    National Institute of Biology, Marine Biological Station, Fornace 41, 6330 Piran, Slovenia Jozef Stefan" Institute, Department of Environmental Sciences, Jamova 39,1000 Ljubljana, Slovenia;

    National Institute of Biology, Marine Biological Station, Fornace 41, 6330 Piran, Slovenia;

    Jozef Stefan" Institute, Department of Environmental Sciences, Jamova 39,1000 Ljubljana, Slovenia;

    Jozef Stefan" Institute, Department of Environmental Sciences, Jamova 39,1000 Ljubljana, Slovenia;

    National Institute of Biology, Marine Biological Station, Fornace 41, 6330 Piran, Slovenia;

    National Institute of Biology, Marine Biological Station, Fornace 41, 6330 Piran, Slovenia;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Metals; Macroaggregates; Colloids; Speciation; Fractionation; Northern Adriatic;

    机译：金属;宏观骨料;胶体;物种分馏;亚得里亚海北部;

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号