Mercury and methylmercury in Hudson River sediment: impact of tidal resuspension on partitioning and methylation
Mercury and methylmercury in Hudson River sediment: impact of tidal resuspension on partitioning and methylation
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DOI：
10.1016/j.marchem.2004.03.011
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发表时间：
2004-11-01
期刊：
影响因子：
3
通讯作者：
Mason, RP
中科院分区：
文献类型：
--
作者：
Heyes, A;Miller, C;Mason, RP
哈德逊河河口受到重金属、多氯联苯和多环芳烃的严重污染。河口泥沙受到大量的侵蚀和再沉积，导致泥沙每年发生复杂的再分布。了解潮汐再悬浮过程中重金属的命运对于评估河口污染物的长期命运至关重要。研究了哈德逊河河口浊度最大值（ETM）内沉积物再悬浮对汞循环的影响。ETM沉积物中总汞（T-Hg）浓度在沉积物上部25 cm处平均为5 nM g（-1）。在潮汐循环期间，我们没有测量到汞从沉积物中解吸。因此，哈德逊河ETM中汞的释放取决于沉积物的流出。甲基汞（MeHg）的平均浓度为6.5 pM g(-1)，尽管河口沉积物中甲基汞的T -汞百分比较高，但低于污染较轻的系统中所观察到的甲基汞百分比。汞甲基化在整个25厘米的上部都很活跃，导致ETM沉积物中有大量的甲基汞。(C) 2004 Elsevier B.V.版权所有
The Hudson River estuary is highly polluted with heavy metals, polychlorinated biphenyls (PCBs) and PAHs. The sediment of the estuary is subjected to substantial erosion and redeposition resulting in a complex redistribution of sediment annually. Understanding the fate of heavy metals during tidal resuspension is crucial to assessing the long-tern fate of pollutants in the estuary. We examined the impact of sediment resuspension on Hg cycling within the estuarine turbidity maximum (ETM) of the Hudson River estuary. Concentrations of total mercury (T-Hg) in the ETM sediment averaged 5 nM g(-1) in the upper 25 cm of sediment. We measured no desorption of Hg from the sediment during a tidal cycle. Therefore, release of mercury from the ETM of the Hudson River is dependent on sediment efflux. Methylmercury (MeHg) concentrations average 6.5 pM g(-1) and although high for estuarine sediments, the percent T -Hg that is MeHg was lower than what has been observed in less contaminated systems. Mercury methylation is active throughout the upper 25 cm resulting in a large pool of MeHg in ETM sediment. (C) 2004 Elsevier B.V. All rights reserved.