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首页> 外文期刊>Journal of Environmental Science and Health. A, Toxic/Hazardous Substances & Environmental Engineering >Total And Methyl Mercury In Wetland Soils And Sediments Of Louisiana's Pontchartrain Basin (usa)
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Total And Methyl Mercury In Wetland Soils And Sediments Of Louisiana's Pontchartrain Basin (usa)

机译：路易斯安那州庞恰特雷恩盆地（美国）的湿地土壤和沉积物中的总汞和甲基汞

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Accumulation of methylmercury (MeHg) in aquatic biota is a primary toxicological concern associated with Hg contamination in the environment. This study reports total mercury (THg) and MeHg measurements in 11 swamp and 24 marsh soils/sediments in wetlands surrounding Lake Pontchartrain and Lake Maurepas located in Louisiana's Pontchartrain Basin. The salinity level ranged from fresh, brackish to salt water. Average THg content in the swamp soils/sediments (112.3 μgkg~(-1),n = 10) was significantly higher (P = 0.04) than in the marsh soils/sediments (56.5 μgkg~(-1), n = 24). The THg content in the marsh soils/sediments tended to decrease with salinity increase, probably due to geographical locations of the sampling sites with less Hg input in more saline regions. Average MeHg content in the soils/sediments was 1.3 μgkg~(-1) (n = 34), higher than reported values in the bottom sediments of Lake Maurepas (0.8 μgkg~(-1), n = 27) and Lake Pontchartrain (0.6 μgkg~(-1), n = 147). Average MeHg/THg ratio in the marsh soils/sediments (0.022) was considerably higher than in the swamp soils/sediments (0.012). Analysis of MeHg/THg ratio along the salinity gradient at the marsh soils/sediments show that the highest MeHg/THg ratio (up to 0.040, n = 5) was found at the fresh/brackish water sites, and the lowest (0.002, n = 1) at the salt water site. Results suggest that there was a greater potential for MeHg formation in wetland soils/sediments than in bottom sediments of adjacent lakes. Results suggest that wetland surrounding the lakes may be a potential source of MeHg to the aquatic food chain and significance is governed by area of the adjacent wetland.
机译：水生生物区中甲基汞（MeHg）的积累是与环境中Hg污染相关的主要毒理学问题。这项研究报告了位于路易斯安那州庞恰特雷恩盆地的庞恰特雷恩湖和莫里帕斯湖周围的湿地中的11个沼泽和24个沼泽土壤/沉积物中的总汞（THg）和MeHg测量值。盐度范围从新鲜，微咸到盐水。沼泽土壤/沉积物中的平均THg含量（112.3μgkg〜（-1），n = 10）明显高于沼泽土壤/沉积物（56.5μgkg〜（-1），n = 24）（P = 0.04） 。沼泽土壤/沉积物中的THg含量会随着盐度的增加而降低，这可能是由于采样地点的地理位置以及在更多盐碱区中汞输入量较少的缘故。土壤/沉积物中的平均MeHg含量为1.3μgkg〜（-1）（n = 34），高于Maurepas湖底部沉积物的报告值（0.8μgkg〜（-1），n = 27）和Pontchartrain湖（ 0.6μgkg〜（-1），n = 147）。沼泽土壤/沉积物中的平均MeHg / THg比（0.022）大大高于沼泽土壤/沉积物中的平均（0.012）。在沼泽土壤/沉积物中沿盐度梯度的MeHg / THg比分析表明，在淡水/微咸水位点发现最高的MeHg / THg比（高达0.040，n = 5），而最低的（0.002，n） = 1）在盐水现场。结果表明，在湿地土壤/沉积物中形成MeHg的潜力比在邻近湖泊的底部沉积物中更大。结果表明，湖泊周围的湿地可能是水生食物链中甲基汞的潜在来源，其重要性由相邻湿地的面积决定。

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