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Zhang X.,Zhejiang iversity | Zhang X.,Key Laboratory of Soil Contamination Bioremediation of Zhejiang Province | He L.,Zhejiang iversity | He L.,Key Laboratory of Soil Contamination Bioremediation of Zhejiang Province | And 4 more authors.
Huanjing Kexue Xuebao/Acta Scientiae Circumstantiae | Year: 2015

Biochars derived from bamboo sawdust (BB) and rice straw (SB) were prepared by pyrolysis at 500℃. Soils mixed with biochars were incubated for 30 d of aging. A batch equilibration method was used to evaluate the effect of aging processes (alternating wet and dry, and constantly moist), feedstock materials and biochar usage (0, 0.1% and 0.5%, w/w) on the adsorption and desorption of diethyl phthalate (DEP) in two vegetable garden soils. The results indicate that biochar amendment significantly enhanced the adsorption of DEP for each treatment and the sorption of DEP increased with increasing usage of biochar. Bamboo biochar were more effective than the straw biochar in improving soils' adsorption capacity and reducing the desorption ability of DEP. Compared with soils amended with fresh biochar treatments, aging treatment reduced the DEP adsorption capacity of the biochar-treated soils. As for different aging conditions, the reduction of adsorption capacity of biochar treated and untreated soils were greater in the alternating wet and dry treatment than in the constantly moist treatment. © 2015, Science Press. All right reserved.

Liang P.,China Agricultural University | Liang P.,Chinese Academy of science | Liang P.,Key Laboratory of Soil Contamination Bioremediation of Zhejiang Province | Feng X.,Chinese Academy of science | And 8 more authors.
Environmental Science and Pollution Research | Year: 2016

The influence from the manufacturing of compact fluorescent lamps (CFL) on mercury (Hg) speciation and distribution in river catchments nearby a typical CFL manufacturing area in China was investigated. Water, sediment, river snail (Procambarus clarkii), and macrophyte (Paspalum distichum L.) samples were collected. Total Hg (THg) and methylmercury (MeHg) concentrations in water ranged from 1.06 to 268 ng · L−1 and N.D. −2.14 ng · L−1, respectively. MeHg was significantly positively correlated with THg in water. THg and MeHg in sediment ranged from 15.0 to 2480 and 0.06 to 1.85 ng · g−1, respectively. River snail samples exhibited high concentrations of THg (206–1437 ng · g−1) and MeHg (31.4–404 ng · g−1). THg and MeHg concentrations in root of P. distichum L. were significantly higher than those in shoot, indicating that THg and MeHg in the plant were mainly attributed to root assimilation. A very high bioaccumulation factor (20.9 ± 22.1) for MeHg in P. distichum L was noted, suggesting that P. distichum L. might have a potential role in phytoremediating MeHg contaminated soil due to its abnormal uptake capacity to MeHg. © 2016 Springer-Verlag Berlin Heidelberg

Liang P.,Zhejiang Agriculture And forestry University | Liang P.,Key Laboratory of Soil Contamination Bioremediation of Zhejiang Province | Wang Y.-N.,Zhejiang Agriculture And forestry University | You Q.-Z.,Zhejiang Agriculture And forestry University | And 2 more authors.
Huanjing Kexue/Environmental Science | Year: 2015

To investigate the influence of marine aquaculture around coal power plant on Hg species change in aquatic ecological environment, the fish farming area in Xiangshan Harbor, Zhejiang province, was studied. The concentrations of different Hg species in sea water collected from marine aquaculture sites (MS) and references sites (RS) were measured. The result showed that the total mercury (THg) concentration in the surface water reached 83.0 pmol·L-1±97.1 pmol·L-1. Dissolved Hg (DHg) in pore water of core sediment decreased with the increasing depth. Meanwhile, the DHg content in pore water above 10 cm was significantly higher (P<0.001) than that below 10 cm, which confirmed the influence of coal-fired power plants on the surrounding areas. THg concentration in MS (96.5 pmol·L-1±133 pmol·L-1) was higher than that in RS (69.5 pmol·L-1±39.4 pmol·L-1), which was mainly resulted from the accumulation of sewage discharge by the employees and fish feed material in sediments during breeding that were further released to the overlying water. Methylmercury concentration in pore water of MS (24.0 pmol·L-1±16.7 pmol·L-1) was also significantly higher than that in RS (6.60 pmol·L-1± 5.11 pmol·L-1), which demonstrated that marine aquaculture activities promoted the methylmercury production by increasing the accumulation of organic matter in sediment. ©, 2015, Huanjing Kexue/Environmental Science. All right reserved.

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