Li Qingzhao, Jiang Lingyan, Wang Dingyong, Luo Xu
Research Center of Environment Pollution Control and Restoration, Zhengzhou Institute of Aeronautical Industry Management, Zhengzhou, 450015, China,
Bull Environ Contam Toxicol. 2015 Jul;95(1):51-5. doi: 10.1007/s00128-015-1549-x. Epub 2015 May 3.
Sediment core samples were collected from the Weihe River in February and August 2013. Cores were sectioned and analyzed for total Hg (THg) and methyl mercury (MeHg). THg in sediment cores ranged from 156 to 282 ng g(-1) in February, and from 172 to 300 ng g(-1) in August. MeHg concentrations ranged from 0.80 to 3.11 ng g(-1) in both seasons. Results showed that the diffusive fluxes were up to two orders of magnitude lower than the in situ benthic fluxes. Fluxes of MeHg measured in in situ experiments in August were positively correlated with [Formula: see text] (r = 0.930). THg and MeHg release were not strongly correlated with TOC in February. Patterns of MeHg flux differed greatly depending on oxidation-reduction potential (Eh) (r > 0.70) conditions in the two seasons.
2013年2月和8月从渭河采集了沉积物岩芯样本。将岩芯切片并分析总汞（THg）和甲基汞（MeHg）。2月沉积物岩芯中的总汞含量在156至282纳克/克之间，8月在172至300纳克/克之间。两个季节的甲基汞浓度均在0.80至3.11纳克/克之间。结果表明，扩散通量比原位底栖通量低两个数量级。8月原位实验中测得的甲基汞通量与[公式：见原文]呈正相关（r = 0.930）。2月总汞和甲基汞的释放与总有机碳没有很强的相关性。两个季节中甲基汞通量的模式因氧化还原电位（Eh）（r > 0.70）条件而有很大差异。
