Purpose The distribution and speciation of mercury in surface water of East River, Guangdong province, China were investigated.

Methods All told 63 water samples were collected during a bi-weekly sampling campaign from July 15th to 26th, 2009.

Results Total mercury (THg) concentrations in water samples ranged from 11 to 49 ng/L. Maximum levels of THg were measured in the lower reaches of East River, where it passes through a major industrial area adjacent to Dongguang city. Higher ratios of dissolved mercury (THg (aq)) in proportion to THg were restricted to the downstream section of East River. Concentrations of the minor constituent methyl mercury varied in the range from 0.08 to 0.21 ng/L. On average, methyl mercury made up 0.8% and 0.56% of THg (aq) and THg, respectively. Dissolved species dominated the speciation of methyl mercury in proportions up to 81%, which may imply that methyl mercury is largely produced in situ within the river water. Environmental factors (such as water temperature, dissolved oxygen, etc.) are regarded to play an important role in Hg methylation processes were monitored and assessed.

Conclusions In an international perspective, East River must be classified as a polluted river with considerably sources within its industrial areas. The THg (aq) and particle mercury fluxes to the Pearl River Estuary by East River runoff were estimated to be 0.31 +/- 0.11 and 0.17 +/- 0.13 t/year, respectively. Hence, in total nearly 0.5 t Hg is annually released to the sea from the East River tributary.

Publication name	ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH　Volume: 19 　Issue: 1 　Pages: 105-112　 JAN 2012
Author(s)	Liu, Jinling; Feng, Xinbin; Zhu, Wei; Zhang, Xian; Yin, Runsheng
Corresponding author	FENG Xinbin  fengxinbin@vip.skleg.cn  Chinese Acad Sci, State Key Lab Environm Geochem, Inst Geochem, Guanshui Rd 43, Guiyang 550002, Peoples R China

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