The Bioaccumulation and Migration of Inorganic Mercury and Methylmercury in the Rice Plants
Daiwen Zhu1, Jichang Han1, Shizhang Wu2
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1Institute of Land Engineering and Technology, Shaanxi Provincial Land Engineering Construction Group Co.,
Ltd. Key Laboratory of Degraded and Unused Land Consolidation Engineering, the Ministry of Land and Resources,
Shaanxi Provincial Land Consolidation Engineering Technology Research Center
Xi’an city, Shaanxi province, China
2PowerChina Northwest Engineering Corporation Limited. Xi’an city, Shaanxi province, China
Submission date: 2016-05-04
Final revision date: 2016-10-25
Acceptance date: 2017-02-13
Online publication date: 2017-07-10
Publication date: 2017-07-25
Pol. J. Environ. Stud. 2017;26(4):1905–1911
In the present study, (NH4)2S2O3 extraction methods were applied to assess bioaccumulation of methylmercury (MeHg) in rice grains, and inorganic mercury (IHg) concentrations in rice leaves were analyzed during the rice growing time to access the bioaccumulation of IHg in rice leaves. The results show that the IHg concentrations in leaves increased in the rice harvest stage, indicating that the limit or no IHg was migrated to the rice grain. Also, the Hg-contaminated leaves may potentially cause the input of ‘new Hg’ into soil, leading to a vicious Hg pollution cycle in a rice paddy system. Our results indicated that MeHg concentrations in leaves could not be used to predict the MeHg bioaccumulation in rice grain. Meanwhile, MeHg transferred capability from soil to leaves decreased with time, which could be the common effect of the decreased soil MeHg bioavailability and translocation of MeHg from leaves to rice grains.