title: [Effect of nano-TiO2 on the release and activation of mercury in sediment].
abstract: To investigate the effects of nano-TiO2 on mercury release and activation in sediment, flooding simulation experiments were conducted. The impacts of nano-TiO2 on total mercury and methylmercury concentrations in overlying water were analyzed. And the influences of nano-TiO2 on the migration and transformation of mercury were discussed based on changes of mercury speciation in sediment. The results indicated that nano-TiO2 promoted the release of mercury in sediment, leading to more mercury released into the water. Compared with the control, 4 g x kg(-1) TiO2 nanoparticles increased the total mercury by 91.32%, when the concentration of total mercury in overlying water was the highest. Release of mercury in soil was increased by approximately 10% finally. The main reason may be that the dissolution of oxidation state mercury was improved by nano-TiO2. It indicated that the risk of mercury contamination in water may increase. Moreover, under the experimental conditions, nano-TiO2 may reduce the formation of methylmercury in sediment in the short-term, but no significant effects in the long-term. Generally, the effects of nano-TiO2 on the release and transformation of mercury in sediment showed concentration dependence. Thus, with increasing nano-TiO2 content in sediment or soil, its impact on the geochemical cycle of mercury may increase.
authors.forename: Jin-Yang
authors.initials: JY
authors.lastname: Zhang
authors.forename: Chu-Xian
authors.initials: CX
authors.lastname: Li
authors.forename: Ding-Yong
authors.initials: DY
authors.lastname: Wang
authors.forename: Xiong
authors.initials: X
authors.lastname: Zhou
authors.forename: Rong-Guo
authors.initials: RG
authors.lastname: Sun
authors.forename: Cheng
authors.initials: C
authors.lastname: Zhang
authors.forename: Liang
authors.initials: L
authors.lastname: Li
mesh_terms: D019015:Geologic Sediments / Q000737:chemistry*; D008628:Mercury / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*; D008767:Methylmercury Compounds / Q000737:chemistry; D012987:Soil; D014025:Titanium / Q000737:chemistry*; D014867:Water; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D008767:Methylmercury Compounds; D012987:Soil; D014874:Water Pollutants, Chemical; D014867:Water; C009495:titanium dioxide; D014025:Titanium; D008628:Mercury