Using linoleic acid embedded cellulose acetate membranes to in situ monitor polycyclic aromatic hydrocarbons in lakes and predict their bioavailability to submerged macrophytes.
Using linoleic acid embedded cellulose acetate membranes to in situ monitor polycyclic aromatic hydrocarbons in lakes and predict their bioavailability to submerged macrophytes.
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DOI：
10.1021/acs.est.5b00863
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发表时间：
2015-04
影响因子：
11.4
通讯作者：
Yuqiang Tao;B. Xue;Shu-chun Yao
中科院分区：
文献类型：
--
作者：
Yuqiang Tao;B. Xue;Shu-chun Yao
到目前为止，还没有使用被动采样器来预测污染物对大型植物的生物有效性。研制了一种新型的被动式采样器--亚油酸-醋酸纤维素膜采样器(LAECAM)，并用它在冬季和夏季对两个湖泊的沉积物孔隙水和水柱中10种多环芳烃的自由溶解浓度进行了现场测定，并预测了它们对沉水植物(Potamogeton marainus、Myriophyllum spicata、Najas Minor All.和Vallisneria Natans(Lour.)Hara)。LAECAMS对多环芳烃的采样可在21天内达到平衡。温度对LAECAM-水分配系数的影响为0.0008-0.0116个对数单位/°C。LAECAM方法与液-液萃取结合FDOC调节、离心/固相萃取和过滤/固相萃取的主动采样方法相当，但也有几个优点。脂肪归一化后，LAECAMS中的多环芳烃浓度与水生植物中的多环芳烃浓度没有显著差异。相比之下，与LAECAM同时部署的含三油油酯被动采样器(TECAM)中的多环芳烃浓度要高得多。结果表明，亚油酸比三油酸更适合作为被动采样器的模型脂来预测沉水植物对多环芳烃的生物有效性。
To date no passive sampler has been used to predict bioavailability of contaminants to macrophytes. Here a novel passive sampler, linoleic acid embedded cellulose acetate membrane (LAECAM), was developed and used to in situ measure the freely dissolved concentrations of ten polycyclic aromatic hydrocarbons in the sediment porewaters and the water columns of two lakes in both winter and summer and predict their bioavailability to the shoots of resident submerged macrophytes (Potamogeton malainus, Myriophyllum spicata, Najas minor All., and Vallisneria natans (Lour.) Hara). PAH sampling by LAECAMs could reach equilibrium within 21 days. The influence of temperature on LAECAM-water partition coefficients was 0.0008-0.0116 log units/°C. The method of LAECAM was comparable with the active sampling methods of liquid-liquid extraction combined with fDOC adjustment, centrifugation/solid-phase extraction (SPE), and filtration/SPE but had several advantages. After lipid normalization, concentrations of the PAHs in LAECAMs were not significantly different from those in the macrophytes. In contrast, concentrations of the PAHs in the triolein containing passive sampler (TECAM) deployed simultaneously with LAECAM were much higher. The results suggest that linoleic acid is more suitable than triolein as the model lipid for passive samplers to predict bioavailability of PAHs to submerged macrophytes.