Field Measurement of Diffusional Mass Transfer of HOCs at the Sediment-Water Interface
Field Measurement of Diffusional Mass Transfer of HOCs at the Sediment-Water Interface
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DOI：
10.1021/es100818w
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发表时间：
2010-09-01
影响因子：
11.4
通讯作者：
Breedveld, Gijs D.
中科院分区：
文献类型：
--
作者：
Eek, Espen;Cornelissen, Gerard;Breedveld, Gijs D.
采用半透膜装置(SPMD)作为吸附材料，在野外条件下测量了多环芳烃和多氯联苯在底泥中的扩散通量。在奥斯陆港用清洁粘土原位覆盖沉积物之前和之后，测量了通量。用通量池测得未封顶污染底泥中的天然芘和PCB52的通量分别为0.3~1.6mgm(-2)d(-1)和2~8ngm(-2)d(-1)。覆盖底泥的通量减少了93-97%。将现场测量的通量与独立计算的通量进行了比较，这些通量是由孔隙水和上覆水中的自由溶解浓度、用平衡被动取样器测量的扩散边界层(DBL)厚度、用雪花石膏溶解方法测量的扩散边界层厚度和扩散系数的文献值独立计算的。未封顶沉积物的测量通量与计算通量吻合较好，测量通量与计算通量之比的中位数为0.9，四分位数区间为0.5-1.6。
The sediment to water diffusive flux of PAHs and PCBs was measured under field conditions with a novel infinite-sink benthic flux chamber that deployed semipermeable membrane devices (SPMD) as a sorbing material. Fluxes were measured before and after in situ capping of sediments in Oslo Harbour with clean clay. The fluxes of native pyrene and PCB 52 from uncapped contaminated sediment measured with the flux chamber were 0.3-1.6 mu g m(-2) d(-1) and 2-8 ng m(-2) d(-1), respectively. Fluxes from the capped sediment were reduced by 93-97%. The in situ measured fluxes were compared to fluxes independently calculated from freely dissolved concentrations in pore water and overlying water, measured using equilibrium passive samplers, diffusive boundary layer (DBL) thickness, measured by an alabaster dissolution method and literature values of diffusion coefficients. Measured fluxes from the uncapped sediment agreed well with calculated fluxes, the median of the ratio of the measured flux over the calculated flux was 0.9 with an inter quartile range of 0.5-1.6.