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首页> 外文期刊>Environmental Science & Technology >Production and Release of Selenocyanate by Different Green Freshwater Algae in Environmental and Laboratory Samples
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Production and Release of Selenocyanate by Different Green Freshwater Algae in Environmental and Laboratory Samples

机译：在环境和实验室样品中不同绿色淡水藻类产生和释放硒代氰酸盐

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摘要

In a previous study, selenocyanate was tentatively identified as a biotransformation product when green algae were exposed to environmentally relevant concentrations of selenate. In this follow-up study, we confirm conclusively the presence of selenocyanate in Chlorclla vutgaris culture medium by electrospray mass spectrometry, based on selenium's known isotopic pattern. We also demonstrate that the observed phenomenon extends to other green algae (Chhrella kesskrii and Scenedesmus obliquus) and at least one species of blue-green algae (Synechocouus kopoliensis). Further laboratory experiments show that selenocyanate production by algae is enhanced by addition of nitrate, which appears to serve as a source of cyanide produced in the algae. Ultimately, this biotransformation process was confirmed in field experiments where trace amounts of selenocyanate (0.215 ± 0.010 ppb) were observed in a eutrophic, selenium-impacted river with massive algal blooms, which consisted of filamentous green algae (Cldophora genus) and blue-green algae (Anabaena genus). Selenocyanate abundance was low despite elevated selenium concentrations, apparently due to suppression of selenate uptake by sulfate, and insufficient nitrogen concentrations. Finally, trace levels of several other unidentified selenium-containing compounds were observed in these river water samples; preliminary suggestions for their identities include thioselenate and small organic Se species.
机译：在先前的研究中，当绿藻暴露于环境相关浓度的硒酸盐时，硒氰酸被初步确定为生物转化产物。在这项后续研究中，我们基于硒的已知同位素模式，通过电喷雾质谱法最终确认了绿藻在培养基中的存在。我们还证明，观察到的现象扩展到其他绿藻（Chhrella kesskrii和斜栅藻）和至少一种蓝绿藻（Synechocouus kopoliensis）。进一步的实验室实验表明，通过添加硝酸盐可增强藻类产生硒氰酸盐的能力，硝酸盐似乎是藻类中产生的氰化物的来源。最终，这种生物转化过程在野外实验中得到了证实，在富硒，富硒，富藻的河流中，有大量藻华，其中包含丝状绿藻（Cldophora属）和蓝绿色，观察到痕量的硒氰酸盐（0.215±0.010 ppb）。藻类（Anabaena属）。尽管硒浓度升高，硒氰酸盐的丰度仍然很低，这显然是由于硫酸盐对硒酸盐的吸收的抑制以及氮浓度不足。最后，在这些河水样品中观察到了痕量的其他几种未鉴定的含硒化合物。有关其身份的初步建议包括硫代硒酸盐和小的有机硒物种。

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  • 来源
    《Environmental Science & Technology》 |2012年第11期|p.5867-5875|共9页
  • 作者

    Kelly L.LeBIanc; Matthew S.Smith; Dirk Wallschlaeger;

  • 作者单位

    Environmental and Life Sciences Graduate Program, Trent University, 1600 West Bank Drive, Peterborough, ON, Canada K9J 7B8;

    Environmental and Life Sciences Graduate Program, Trent University, 1600 West Bank Drive, Peterborough, ON, Canada K9J 7B8;

    Environmental & Resource Sciences Program and Department of Chemistry,Trent University, 1600 West Bank Drive, Peterborough, ON, Canada K9J 7B8;

  • 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);
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