Back to Search
Start Over
Mechanism of Accumulation of Methylmercury in Rice ( Oryza sativa L.) in a Mercury Mining Area
- Source :
- Environmental sciencetechnology. 52(17)
- Publication Year :
- 2018
-
Abstract
- Rice consumption is the primary pathway for methylmercury (MeHg) exposure at inland mercury (Hg) mining areas of China. The sources and processes of formation and translocation for MeHg in rice plant are complex and remain largely unknown. In this study, rice (Oryza sativa L.) was exposed to isotopically labeled dimethylmercury (DMe199Hg) in field experiments using open top chambers to explore the response of MeHg accumulation in rice tissues to different levels of DMe199Hg in air. Rice leaves assimilated DMeHg from air, which was subsequently largely stored in aboveground tissues, including the rice grain, with only a small amount reaching the root. Combining these experimental results with field investigations of DMeHg concentrations in air beneath the rice canopy in a Hg mining area, we estimate that 15.5%, 10.8%, and 8.50% MeHg in the brown rice, the leaf, and the upper stalk, respectively, could be derived from atmospheric sources of DMeHg, while 99.5% of MeHg in rice root originated from the rice so...
- Subjects :
- Canopy
China
010504 meteorology & atmospheric sciences
Dimethylmercury
chemistry.chemical_element
010501 environmental sciences
01 natural sciences
Mining
chemistry.chemical_compound
Environmental Chemistry
Soil Pollutants
Methylmercury
0105 earth and related environmental sciences
Oryza sativa
food and beverages
Rice grain
Oryza
General Chemistry
Mercury
Methylmercury Compounds
Mercury (element)
chemistry
Agronomy
Stalk
Brown rice
Environmental Monitoring
Subjects
Details
- ISSN :
- 15205851
- Volume :
- 52
- Issue :
- 17
- Database :
- OpenAIRE
- Journal :
- Environmental sciencetechnology
- Accession number :
- edsair.doi.dedup.....85f887eb9dfcd58e9b383e11f96742e3