Health exposure risk of methylmercury through rice consumption in Guiyang City, southwest China

Jialiang Han1, Z. Chen2, J. Pang2, L. Liang1, X. Fan2 and Q. Li3

1 College of Resources and Environmental Engineering, Guizhou University, China.

2 School of Chemistry and Material Science, Guizhou Normal University, China;

3 Key Laboratory for Information System of Mountainous Area and Protection of Ecological Environment of Guizhou Province, Guizhou Normal University, China

Hanjialiang627@126.com

Rice consumption is the main methylmercury (MeHg) exposure route for residents in mercury (Hg) mining areas. However, there is limited studies on mercury in commercial rice, which has high liquidity and can be directly consumed by urban residents. In this study, 146 rice samples were purchased from Guiyang markets, and total Hg (THg) and MeHg concentrations were measured. Both the inorganic Hg (IHg) and MeHg were used to calculated estimated daily intakes (EDIs) and hazard quotients (HQs). The THg concentrations in all rice samples (range: 0.97 to 13.10 μg·kg−1; mean: 3.88 μg·kg−1) were lower than the Chinese national standard (20 μg·kg−1) set by Chinese Ministry of Health. The average MeHg concentration in rice was 1.16 μg·kg−1. There was no significant difference between the THg (T test, P=0.61) and MeHg (T test, P=0.17) concentrations of Japonica rice and Indica rice. Different brands of rice have different concentrations of THg and MeHg. The total HQs (THQs) ranged from 0.0106 to 0.1048, with a mean of 0.0462, which was far lower than 1. This result suggests that there was low Hg exposure through rice consumption for residents in Guiyang.

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