Relationship between the concentrations of dissolved organic matter and polycyclic aromatic hydrocarbons in a typical U.K. upland stream.
Relationship between the concentrations of dissolved organic matter and polycyclic aromatic hydrocarbons in a typical U.K. upland stream.
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DOI：
10.1021/es403707q
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发表时间：
2014
影响因子：
11.4
通讯作者：
C. Moeckel;D. Monteith;N. Llewellyn;P. Henrys;M. Pereira
中科院分区：
文献类型：
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作者：
C. Moeckel;D. Monteith;N. Llewellyn;P. Henrys;M. Pereira
总的和自由溶解的多环芳烃（PAHs）和溶解的有机碳（DOC）的浓度进行了测量，在四个采样事件中收集的水在五个站点从河怀尔。这些地点是英国西北部典型的排水高地有机土壤的溪流。自由溶解的多环芳烃分离与DOC使用絮凝方法。总的和自由溶解的多环芳烃的浓度分析范围分别为2.71至18.9纳克/升和2.61至16.8纳克/升。多环芳烃浓度和多环芳烃通量来自浓度和水流量一般增加下游，在后者的趋势更为明显。含有五个或更多芳香环的单个多环芳烃的浓度与DOC浓度密切相关（p < 0.0001），表明共同的陆地来源和水文途径。相比之下，没有显着的关系，观察与四环或更少的多环芳烃和DOC的浓度之间。四环以上的PAHs浓度与DOC浓度的季节变化趋势相似（峰值出现在夏末），而二环和三环的PAHs浓度与DOC浓度的季节变化趋势相反（峰值出现在冬季）。由于多环芳烃DOC的关系出现部分依赖于多环芳烃的分子量，线性回归函数，包括这个变量和DOC浓度之间的相互作用被用来模拟PAH浓度超过2年的时间来估计年通量。多环芳烃浓度和DOC之间的关系，应有助于提高多环芳烃监测数据的解释，目前稀疏的空间和时间，从而使这些环境污染物的潜在风险更强大的评估敏感的水生生物和人类供水。
Concentrations of total and freely dissolved polycyclic aromatic hydrocarbons (PAHs) and dissolved organic carbon (DOC) were measured in water collected during four sampling events at five sites from the River Wyre. The sites are typical of streams draining upland organically rich soils in northwest U.K. Freely dissolved PAHs were separated from those associated with DOC using a flocculation method. The sum of concentrations of the total and freely dissolved PAHs analyzed ranged from 2.71 to 18.9 ng/L and 2.61 to 16.8 ng/L, respectively. PAH concentrations and PAH fluxes derived from concentrations and water flow rates generally increased downstream, the trend in the latter being more pronounced. The concentration of individual PAHs containing five or more aromatic rings was found to be strongly correlated to the DOC concentration (p < 0.0001), suggesting common terrestrial sources and hydrological pathways. In contrast, no significant relationships were observed between concentrations of PAHs with four or fewer rings and DOC. Concentrations of PAHs with more than four rings showed similar seasonal variation as DOC concentration (peaking in the late summer), while variation in two or three ring PAHs was out of phase with DOC (peaking in the winter). As the PAH-DOC relationship appeared partly dependent on the molecular weight of the PAHs, a linear regression function that included an interaction between this variable and DOC concentration was used to model PAH concentrations over a 2 year period to estimate annual fluxes. The relationship identified between PAH concentrations and DOC should help to enhance interpretation of PAH monitoring data that are currently sparse both spatially and temporally and, thus, enable more robust assessments of the potential risks of these environmental pollutants to sensitive aquatic organisms and human water supplies.