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首页> 外文期刊>Journal of great lakes research >Do wood fibers from a pulp mill affect the distribution of total and methyl mercury in river sediments?
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Do wood fibers from a pulp mill affect the distribution of total and methyl mercury in river sediments?

机译：制浆厂的木纤维会影响河流沉积物中总汞和甲基汞的分布吗？

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摘要

The St. Lawrence River near Cornwall Ontario is affected by industrial mercury contamination of sediments and biota. It has been suggested that pulp and paper mill effluents may stimulate bacterial mercury methyl-ation in these sediments, leading to contamination of aquatic biota. To test this hypothesis, we examined sed-iment-porewater dynamics of total mercury (THg) and methyl mercury (MeHg) at a site with high concentrations of wood fibers from a pulp and paper mill effluent and a nearby reference site with low wood fiber content. Dissolved phase THg (THg_(diss)) and MeHg (MeHg_(diss)) in porewater profiles showed that 38±30.9% (SD) ofTHg in porewaters was in the methylated form regardless of wood fiber content. MeHg_(diss) and THg_(diss) concentrations were homogeneous between porewater and overlying water, indicating (a) that there is minimal net diffusion of MeHg_(diss) and THg_(diss) and (b) that redox-dependent processes such as sulfate reduction and Fe reduction were not associated with MeHg_(diss) distribution in these sediment profiles. MeHg and THg in solid phase showed coincident subsurface peaks at depths > 40 cm suggesting either that historical deposits of MeHg on particles (MeHg_((p))) are preserved in deep sediments, or that Hg methylation is active in deep sediments.
机译：安大略省康沃尔郡附近的圣劳伦斯河受到沉积物和生物群工业汞污染的影响。有人认为，纸浆和造纸厂的废水可能会刺激这些沉积物中的细菌汞甲基化，从而导致水生生物的污染。为了检验该假设，我们在纸浆和造纸厂废水中含有高浓度木纤维的站点和附近木纤维含量低的参考站点中，检查了总汞（THg）和甲基汞（MeHg）的沉积物-孔隙水动力学。内容。孔隙水特征曲线中的溶解相THg（THg_（diss））和MeHg（MeHg_（diss））表明，无论木纤维含量如何，孔隙水中THg的38±30.9％（SD）均为甲基化形式。 MeHg_（diss）和THg_（diss）浓度在孔隙水和上覆水之间是均匀的，这表明（a）MeHg_（diss）和THg_（diss）的净扩散最小，并且（b）依赖于氧化还原的过程（例如硫酸盐）还原和铁还原与这些沉积物中的MeHg_（diss）分布无关。固相中的MeHg和THg在大于40 cm的深度处显示出一致的地下峰，表明要么在颗粒（MeHg _（（p）））上保留了MeHg的历史沉积物，要么在深层沉积物中保留了Hg甲基化作用。

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