Examining the correlation between quantifiable SVOCs and organic carbon content or particulate size in benthic sediments as a function of ocean stratum.,Environmental Science: Processes & Impacts

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Examining the correlation between quantifiable SVOCs and organic carbon content or particulate size in benthic sediments as a function of ocean stratum.
Environmental Science: Processes & Impacts ( IF 4.3 ) Pub Date : 2020-02-14 , DOI: 10.1039/c9em00555b
Ochan Otim ₁

Affiliation

The raw analytical concentration values of semi-volatile organic compounds (SVOCs) in ocean sediments do not necessarily reflect the bioavailable fractions of SVOCs in the sediments due to factors such as the total organic carbon content of sediments (TOC) and the percentage of fine particles in sediments (% fines) as they are believed to affect the extraction efficiency of SVOCs from sediments. Corrective actions are therefore taken to minimize their influence on measurements. In doing so, a broad and uniform correlation is assumed to exist between the ‘native’ levels of SVOCs and TOC or % fines across ocean strata. However, the validity of this blanket assumption is not yet verified. In this study, we examined the strength of the assumption using DDTs, PAHs and PCBs levels in sediments from Santa Monica Bay (SMB), California, USA. (The distribution patterns of these SVOCs in SMB are known and reproducible for quality assurance.) As our results show, a uniform correlation between SVOC levels and TOC or % fines across strata is mostly absent. For example, PAH and PCB levels show negative correlation with TOC or % fines, and only in canyon sediments, DDT levels correlate positively with both TOC and % fines across at least three strata. Furthermore, the distribution of PAH molecules appears to be controlled by molecular size with smaller PAHs being found almost exclusively in the canyons. Our finding here, being the first of its kind, suggests that more work is needed to clarify the reporting of SVOC levels in ocean sediments.

中文翻译：

研究底栖沉积物中可计量的SVOC与有机碳含量或颗粒大小之间的相关性，作为海洋地层的函数。

由于沉积物的总有机碳含量（TOC）和细颗粒的百分比等因素，海洋沉积物中半挥发性有机化合物（SVOC）的原始分析浓度值不一定反映沉积物中SVOC的生物利用分数。被认为会影响沉积物中SVOC的提取效率（％细粉）。因此，应采取纠正措施以最大程度地减少对测量的影响。这样做时，假定SVOC的“天然”水平与TOC或整个海洋地层的罚款百分比之间存在广泛而统一的相关性。但是，这一笼统假设的有效性尚未得到验证。在这项研究中，我们使用美国加利福尼亚州圣莫尼卡湾（SMB）沉积物中的滴滴涕，多环芳烃和多氯联苯含量检验了假设的强度。（为确保质量保证，这些SVOC在中小型企业中的分布方式是已知的，并且可重现。）正如我们的结果所示，大多数情况下，SVOC含量与TOC或粉尘百分比之间几乎没有统一的关联。例如，PAH和PCB含量与TOC或细粉百分比呈负相关，仅在峡谷沉积物中，DDT含量至少在三个层次上与TOC和细粉百分比呈正相关。此外，PAH分子的分布似乎受分子大小控制，较小的PAH几乎仅在峡谷中发现。我们在这里的发现尚属首次，这表明需要做更多的工作来澄清海洋沉积物中SVOC含量的报告。几乎没有SVOC水平与TOC或各层罚款百分比之间的均一相关性。例如，PAH和PCB含量与TOC或细粉百分比呈负相关，仅在峡谷沉积物中，DDT含量至少在三个层次上与TOC和细粉百分比呈正相关。此外，PAH分子的分布似乎受分子大小控制，较小的PAH几乎仅在峡谷中发现。我们在这里的发现尚属首次，这表明需要做更多的工作来澄清海洋沉积物中SVOC含量的报告。几乎没有SVOC水平与TOC或各层罚款百分比之间的均一相关性。例如，PAH和PCB含量与TOC或细粉百分比呈负相关，仅在峡谷沉积物中，DDT含量至少在三个层次上与TOC和细粉百分比呈正相关。此外，PAH分子的分布似乎受分子大小控制，较小的PAH几乎仅在峡谷中发现。我们在这里的发现尚属首次，这表明需要做更多的工作来澄清海洋沉积物中SVOC含量的报告。PAH分子的分布似乎受分子大小控制，较小的PAH几乎仅在峡谷中发现。我们在这里的发现尚属首次，这表明需要做更多的工作来澄清海洋沉积物中SVOC含量的报告。PAH分子的分布似乎受分子大小控制，较小的PAH几乎仅在峡谷中发现。我们在这里的发现尚属首次，这表明需要做更多的工作来澄清海洋沉积物中SVOC含量的报告。

更新日期：2020-02-14

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