Ding Zhen-hua, Wu Hao, Liu Yang, Yuan Yan-ting, Zhang Ling
School of Life Science, Xiamen University, Xiamen 361005, China.
Huan Jing Ke Xue. 2010 Aug;31(8):1701-7.
Total mercury (THg), methylmercury (MeHg) and environmental factors were determined to study distributions of MeHg and Hg methylation in the sediments from 8 main mangrove areas of China. The results showed that it was not consistent for distributions of THg and MeHg in sediments. Concentrations of MeHg in sediments from Sanya, Dongzhaigang (Hainan Province), Techengdao, Leizhou, Gaoqiao, Futian (Guangdong Province), Daguansha (Guangxi Autonomous Region), Fugong (Fujian Province) were (0.24 +/- 0.04), (0.58 +/- 0.27), (0.52 +/- 0.23), (1.56 +/- 0.49), (0.50 +/- 0.25), (1.21 +/- 0.36), (1.86 +/- 1.04), (0.47 +/- 0.16) ng x g(-1) respectively. There were regional difference in MeHg contents which decreased in the order of Daguansha > Leizhou > Futian > Dongzhaigang > Techengdao > Gaoqiao > Fugong > Sanya. Input of Hg and organic matter from industry and aquiculture may lead to high level of MeHg. Compared with sediments from other estuaries of the world, serious pollution of MeHg was found in mangrove sediments of China. (2) % MeHg in mangrove sediments ranged from 0.11% to 7.13%, which decreased in the order of Daguansha > Techengdao > Leizhou > Futian > Gaoqiao > Dongzhaigang > Sanya > Fugong. There was significantly positive correlation between % MeHg and sandy fraction (p < 0.05), and significantly negative correlation between % MeHg and silt-clay fraction (p < 0.05). (3) Total bacteria (TB) in mangrove sediments ranged from 2.44 x 10(10) to 1.91 x 10(11) CFU/g (dry weight), TB decreased in the order of Fugong > Sanya > Gaoqiao > Dongzhaigang > Futian > Daguansha. Sulfate-reducing bacterium (SRB) ranged from 1.73 x 10(4) to 4.92 x 10(6) CFU/g, SRB decreased in the order of Futian > Fugong > Dongzhaigang > Sanya > Gaoqiao > Daguansha. Wastewater with high organic matters leads to high SRB. The types of surface sediments also had a great impact on the amount of SRB. There was no significant correlation among MeHg and environmental factors, which indicated that exogenous input is the main cause of MeHg pollution in mangrove sediments.
测定了总汞（THg）、甲基汞（MeHg）及环境因子，以研究中国8个主要红树林地区沉积物中MeHg的分布及汞甲基化情况。结果表明，沉积物中THg和MeHg的分布不一致。三亚、东寨港（海南省）、特呈岛、雷州、高桥、福田（广东省）、大观沙（广西自治区）、福贡（福建省）沉积物中MeHg的浓度分别为（0.24±0.04）、（0.58±0.27）、（0.52±0.23）、（1.56±0.49）、（0.50±0.25）、（1.21±0.36）、（1.86±1.04）、（0.47±0.16）ng x g⁻¹。MeHg含量存在区域差异，其递减顺序为大观沙＞雷州＞福田＞东寨港＞特呈岛＞高桥＞福贡＞三亚。工业和水产养殖中汞和有机物的输入可能导致MeHg含量升高。与世界其他河口的沉积物相比，中国红树林沉积物中MeHg污染严重。（2）红树林沉积物中MeHg的占比范围为0.11%至7.13%，其递减顺序为大观沙＞特呈岛＞雷州＞福田＞高桥＞东寨港＞三亚＞福贡。MeHg占比与砂质组分之间存在显著正相关（p＜0.05），与粉砂-粘质组分之间存在显著负相关（p＜0.05）。（3）红树林沉积物中的总细菌（TB）范围为2.44×10¹⁰至1.91×10¹¹CFU/g（干重），TB的递减顺序为福贡＞三亚＞高桥＞东寨港＞福田＞大观沙。硫酸盐还原菌（SRB）范围为1.73×10⁴至4.92×10⁶CFU/g，SRB的递减顺序为福田＞福贡＞东寨港＞三亚＞高桥＞大观沙。高有机物废水导致SRB数量增加。表层沉积物类型对SRB数量也有很大影响。MeHg与环境因子之间无显著相关性，这表明外源输入是红树林沉积物中MeHg污染的主要原因。
