Impact of bromide exposure on natural organochlorine loss from coastal wetland soils in the Winyah Bay, South Carolina.,Environmental Science: Processes & Impacts

当前位置： X-MOL 学术 › Environ. Sci.: Processes Impacts › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Impact of bromide exposure on natural organochlorine loss from coastal wetland soils in the Winyah Bay, South Carolina.
Environmental Science: Processes & Impacts ( IF 4.3 ) Pub Date : 2020-02-21 , DOI: 10.1039/c9em00604d
Danielle R Schlesinger ₁ , Satish C B Myneni

Affiliation

Naturally formed halogenated organic compounds are common in terrestrial and marine environments and play an important role in the halogen cycle. Among these halogenated compounds, chlorinated organic compounds are the most common halogenated species in all soils and freshwater sediments. This study evaluated how a previously observed phenomenon of bromination of organic matter in coastal soils due to salt-water intrusion impacts the stability and fate of natural organochlorine (org-Cl) in coastal wetland soils. The reacted solid and liquid samples were analyzed using X-ray spectroscopy (in cm and at micron scales for solids) and ion chromatography. We find that introduction of Br- species and their subsequent reactions with organic carbon are associated with an average of 39% loss of org-Cl species from leaf litter and soil. The losses are more prominent in org-Cl hotspots of leaf litter, and both aliphatic and aromatic organochlorine compounds are lost from all samples at high Br- concentrations. The combination of solid and aqueous phase analysis suggests that org-Cl loss is most likely largely associated with volatilization of org-Cl. Release of labile org-Cl compounds has detrimental environmental implications for both ecosystem toxicity, and stratospheric ozone. The reactions similar to those observed here can also have implications for the reactions of xenobiotic chlorinated compounds in soils.

中文翻译：

接触溴化物对南卡罗来纳州Winyah湾沿海湿地土壤天然有机氯损失的影响。

天然形成的卤代有机化合物在陆地和海洋环境中很常见，并在卤素循环中起重要作用。在这些卤代化合物中，氯化有机化合物是所有土壤和淡水沉积物中最常见的卤代物种。这项研究评估了先前观察到的咸水入侵造成的沿海土壤有机物溴化现象如何影响沿海湿地土壤中天然有机氯（org-Cl）的稳定性和命运。反应的固体和液体样品使用X射线光谱分析仪（以厘米为单位，以微米为单位）和离子色谱进行分析。我们发现，Br-物种的引入以及它们随后与有机碳的反应与叶子凋落物和土壤中org-Cl物种平均损失39％有关。在凋落物的org-Cl热点中，损失更为突出，在高Br-浓度下，所有样品中的脂肪族和芳香族有机氯化合物都流失了。固相和水相分析的结合表明，org-cl的损失最有可能与org-cl的挥发有关。不稳定的org-Cl化合物的释放对生态系统毒性和平流层臭氧都有不利的环境影响。与此处观察到的反应相似的反应也可能影响土壤中异生物素氯化物的反应。固相和水相分析的结合表明，org-cl的损失最有可能与org-cl的挥发有关。不稳定的org-Cl化合物的释放对生态系统毒性和平流层臭氧都有不利的环境影响。与此处观察到的反应相似的反应也可能影响土壤中异生物素氯化物的反应。固相和水相分析的结合表明，org-cl的损失最有可能与org-cl的挥发有关。不稳定的org-Cl化合物的释放对生态系统毒性和平流层臭氧都有不利的环境影响。与此处观察到的反应相似的反应也可能影响土壤中异生物素氯化物的反应。

更新日期：2020-02-21

点击分享查看原文

点击收藏

阅读更多本刊最新论文