Sensitive Equilibrium Sampling To Study Polychlorinated Biphenyl Disposition in Baltic Sea Sediment
Sensitive Equilibrium Sampling To Study Polychlorinated Biphenyl Disposition in Baltic Sea Sediment
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DOI：
10.1021/es302330v
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发表时间：
2012-09-18
影响因子：
11.4
通讯作者：
McLachlan, Michael S.
中科院分区：
文献类型：
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作者：
Jahnke, Annika;Mayer, Philipp;McLachlan, Michael S.
一个平衡采样方法，使用玻璃瓶与pm薄涂层的有机硅聚二甲基硅氧烷（PDMS）进行了验证，并适用于背景沉积物样品从一个>50公里的样带在斯德哥尔摩群岛。使用不同的涂层厚度证明了沉积物和PDMS之间的平衡。根据PDMS中多氯联苯（PCBs）的浓度，我们评估了（i）沉积物间隙水中的自由溶解浓度（C-Sediment_free）;（ii）沉积物和水之间的平衡状态;（iii）沉积物和生物群之间的平衡状态;（iv）特定地点的沉积物/水分配比（K-D）。结果表明：（i）斯德哥尔摩港是波罗的海PCBs的一个污染源，斯德哥尔摩港的无沉积物碳含量明显高于波罗的海;（ii）沉积物中PCBs的逸度大于水体中PCBs的逸度（iii）沉积物中的逸度超过鲱鱼中的逸度，平均为5.2;斯德哥尔摩港附近的K-D比外群岛大0.3-1.7个对数单位。涂层玻璃瓶方法具有高精度和内置的QA/QC功能，为研究背景环境中痕量疏水化学品（C-Sediment_free至1.06 fg/L）的处置开辟了新的可能性。
An equilibrium sampling approach using glass jars with pm thin coatings of the silicone polydimethylsiloxane (PDMS) was validated and applied to background sediment samples from a >50 km transect in the Stockholm Archipelago. Equilibrium between the sediment and the PDMS was demonstrated using different coating thicknesses. From the concentrations of polychlorinated biphenyls (PCBs) in the PDMS, we assessed (i) freely dissolved concentrations in the sediment interstitial porewater (C-Sediment_free); (ii) the equilibrium brium status between sediment and water; (iii) the equilibrium status between sediment and biota; and (iv) site-specific sediment/water distribution ratios (K-D). The results showed that (i) Stockholm was a source of PCBs to the Baltic Sea as evidenced by significantly higher C-Sediment_free in Stockholm Harbor; (ii) the fugacity in sediment exceeded that in water (monitoring samples collected in February) by an average factor of 4.0; (iii) the fugacity in sediment exceeded that in herring by an average factor of 5.2; and (iv) K-D near Stockholm Harbor was 0.3-1.7 log units greater than in the outer archipelago. The coated glass jar method with its high precision and built-in QA/QC opens new possibilities to study the disposition of hydrophobic chemicals at trace levels (C-Sediment_free down to 1.06 fg/L) in background environments.