Booij Kees, Hoedemaker José R, Bakker Joop F
Royal Netherlands Institute for Sea Research, P.O. Box 59, 1790 AB Texel, The Netherlands.
Environ Sci Technol. 2003 Sep 15;37(18):4213-20. doi: 10.1021/es034147c.
Aqueous concentrations of polychlorinated biphenyls (PCBs), polyaromatic hydrocarbons (PAHs), pentachlorobenzene, and hexachlorobenzene (HCB) were determined by exposing low-density polyethylene (LDPE) strips to the pore waters and the overlying water in two contaminated harbors. LDPE strips were also exposed in the laboratory to sediment slurries and to stagnant sediments collected at the same locations. Surprisingly short equilibration time scales (1-60 days for log K(ow) < 7) were observed for the exposures to sediment slurries. This was a result of a profound decrease in transport resistance, due to the presence of particles in the aqueous boundary layer. Concentrations in the pore water were calculated from the initial uptake rates and the dissipation rates of performance reference compounds. Good correspondence existed with concentrations estimated from the equilibrium amounts in the strips and LDPE-water partition coefficients. Sediment-water partition coefficients for PAHs were higher than for PCBs and chlorobenzenes by approximately 1 order of magnitude. A one-dimensional diffusion model was used to describe contaminant uptake by LDPE strips from stagnant sediments. The results indicated that 95% of the PAHs and 50% of the PCBs were immobile on a time scale of two months. A comparison of concentrations in pore waters and water columns indicated that a fair degree of equilibrium existed for PCBs and that one sediment was a potential source of PAHs. Concentrations of HCB near a former discharge site were higher by a factor of 6 compared to reference locations.
通过将低密度聚乙烯（LDPE）条带暴露于两个受污染港口的孔隙水和上覆水中，测定了多氯联苯（PCBs）、多环芳烃（PAHs）、五氯苯和六氯苯（HCB）的水相浓度。LDPE条带还在实验室中暴露于沉积物浆液以及在相同位置采集的停滞沉积物中。对于暴露于沉积物浆液的情况，观察到平衡时间尺度惊人地短（对于log K(ow) < 7的情况为1 - 60天）。这是由于水相边界层中存在颗粒导致传输阻力大幅降低的结果。根据性能参考化合物的初始摄取速率和消散速率计算孔隙水中的浓度。与根据条带中的平衡量和LDPE - 水分配系数估算的浓度存在良好的对应关系。PAHs的沉积物 - 水分配系数比PCBs和氯苯高约1个数量级。使用一维扩散模型描述LDPE条带从停滞沉积物中摄取污染物的情况。结果表明，在两个月的时间尺度上，95%的PAHs和50%的PCBs是不可移动的。孔隙水和水柱中浓度的比较表明，PCBs存在相当程度的平衡，并且一个沉积物是PAHs的潜在来源。与参考位置相比，前排放点附近的HCB浓度高出6倍。
