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首页> 外文学位 >The influence of speciation on selenium uptake by a benthic euryhaline polychaete, Neanthes succinea.
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The influence of speciation on selenium uptake by a benthic euryhaline polychaete, Neanthes succinea.

机译：底栖鱼腥草多毛小鸟Neanthes succinea对形态形成对硒摄取硒的影响。

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摘要

This study was performed to characterize the selenium (Se) content and speciation of the sediments of the Salton Sea, to distinguish and differentiate Se uptake via different routes, to determine which selenium species are bioavailable to the benthic invertebrates of this system utilizing a euryhaline polychaete worm, Neanthes succinea, and to estimate and predict Se assimilation from dietary sources through different extraction techniques. Evaluation of the Se content and speciation of the sediments involved grab samples of the upper 10 cm of sediment, collected from 11 sample locations across the Sea. Selenium concentrations ranged from 0.3--10.6 mg Se kg -1 dw, with Se tending to accumulate more in the interior portion of the Sea. Speciation of the Salton Sea sediments was determined using a sequential extraction procedure (SEP 2OH), with results showing that the primary selenium fractions of concern included two organic Se fractions (SEP III and V) and the elemental Se fraction (SEP IV).;Evaluation of dissolved Se assimilation was assessed utilizing N. succinea and various concentrations of selenite (Se (IV)) and selenate (Se (VI)). It was shown that dissolved Se (IV) was assimilated more readily than Se (VI) and that juvenile organisms demonstrated significantly greater uptake than adults. Bioavailability and assimilation of dietary Se was examined by creating a synthetic model sediment labeled with stable isotopic Se formed to mimic the Se fractions in the Salton Sea sediment. The greatest assimilated Se came from the organic Se fraction.;Examination of different extraction techniques to aid in estimating and predicting Se assimilation by N. succinea were performed by solubilizing Se using various extractants. A high positive correlation between Se assimilation by N. succinea and the extracted Se from SEP 2OH step III was found. This extraction technique may provide a very promising tool in predicting Se assimilation in benthic organisms, although the number of sediments tested needs to be increased to draw more significant conclusions.
机译：进行这项研究的目的是表征索尔顿海沉积物中硒（Se）的含量和形态，以区分和区分通过不同途径摄取的硒，从而利用鱼腥藻多毛cha来确定该系统的底栖无脊椎动物生物可利用的硒种类。蠕虫（Neanthes succinea），并通过不同的提取技术来估计和预测饮食中硒的同化作用。对硒含量和沉积物形态的评估涉及从整个海洋的11个采样点采集的上部10厘米沉积物的样品。硒浓度范围为0.3--10.6 mg Se kg -1 dw，Se倾向于在海洋内部积累更多。萨尔顿海沉积物的形态采用顺序提取程序（SEP 2OH）确定，结果表明，所关注的主要硒组分包括两个有机硒组分（SEP III和V）和元素硒组分（SEP IV）。利用琥珀色猪笼草和各种浓度的亚硒酸盐（Se（IV））和硒酸盐（Se（VI））评估溶解的Se同化作用。结果表明，溶解的硒（Ⅳ）比硒（Ⅵ）更容易被同化，并且幼生物体的摄取明显高于成年人。日粮中硒的生物利用度和同化作用通过创建合成模型沉积物来检验，该沉积物标记有稳定的同位素硒，形成的模拟塞尔顿海沉积物中的硒组分。最大的同化硒来自有机硒组分。通过使用多种萃取剂对硒进行增溶，研究了不同的提取技术，以帮助估算和预测琥珀色猪笼草对硒的同化作用。发现琥珀色猪笼草的Se同化与从SEP 2OH步骤III中提取的Se之间存在高度正相关。尽管需要增加被测沉积物的数量以得出更重要的结论，但这种提取技术可能为预测底栖生物中的硒同化提供了非常有前途的工具。

著录项

  • 作者

    Thrippleton-Hunter, Kelly Ann.;

  • 作者单位

    University of California, Riverside.;

  • 授予单位 University of California, Riverside.;
  • 学科 Environmental Sciences.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 120 p.
  • 总页数 120
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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