中国主要红树林湿地表层沉积物中汞的分布与形态
Distribution and speciation of mercury in surficial sediments from main mangrove wetlands in China.
作者信息
Ding Z H, Liu J L, Li L Q, Lin H N, Wu H, Hu Z Z
机构信息
Key Laboratory of Ministry of Education for Coastal and Wetland Ecosystems, and School of Life Sciences, Xiamen University, 422# South Siming Road , Xiamen 361005, Fujian Province , China.
出版信息
Mar Pollut Bull. 2009 Sep;58(9):1319-25. doi: 10.1016/j.marpolbul.2009.04.029. Epub 2009 May 27.
The purpose of this study was to establish the distribution, speciation and bioavailability of mercury in mangrove sediments. A systemic survey of surficial sediments from 13 mangrove wetlands of China was carried out. Hg concentrations ranged from 2.3-903.6ngg(-1), with an average value of 189.4ngg(-1). Of the 13 areas surveyed, the Hg content in sediments was similar to background levels in 6 areas but was much higher in the other seven areas. Hg levels were affected by natural and anthropogenic factors, including terrestrial pollutants, geomorphic properties, and indirectly by economic status. Hg levels were positively correlated with organic matter, pH, and silt and clay fractions, but Hg was negatively correlated with sand fraction. In most mangrove wetlands, Hg existed primarily in the form of volatile Hg. Hg is easily bioaccumulated in mangrove wetlands and may be the natural source of Hg emissions to the atmosphere.
本研究的目的是确定红树林沉积物中汞的分布、形态及生物有效性。对中国13个红树林湿地的表层沉积物进行了系统调查。汞浓度范围为2.3 - 903.6 ng g⁻¹，平均值为189.4 ng g⁻¹。在所调查的13个区域中，6个区域沉积物中的汞含量与背景水平相似，但其他7个区域的汞含量要高得多。汞含量受自然和人为因素影响，包括陆地污染物、地貌特征，以及间接受经济状况影响。汞含量与有机质、pH值、粉砂和黏土组分呈正相关，但与砂质组分呈负相关。在大多数红树林湿地中，汞主要以挥发性汞的形式存在。汞很容易在红树林湿地中生物累积，并且可能是大气汞排放的天然来源。
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