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Authors: Zhao, Xu | Quan, Xie | Zhao, Hui-min | Chen, Jing-wen | Chen, Shou | Zhao, Ya-zhi

Article Type: Research Article

Abstract: Effects of natural organic matters (NOM) and hydrated metal oxides (HMO) in sediments on the anaerobic degradation of γ-666, p,p'-DDT and HCB were investigated by means of removing NOM and HMO in Liaohe River sediments sequentially. The results showed that the anaerobic degradation of γ-666, p,p'-DDT and HCB followed pseudo-first-order kinetics in different sediments. But, the extents and rates of degradation were different, even the other conditions remained the same. Anaerobic degradation rates of γ-666, p,p'-DDT and HCB were 0.020 d^{−1}, 0.009 d^{−1} and 0.035 month^{−1} respectively for the sediments without additional carbon resources. However, with addition of carbon resources, …the anaerobic degradation rates of γ-666, p, p'-DDT and HCB were 0.071 d^{−1}, 0.054 d^{−1} and 0.088 month^{−1} in the original sediments respectively. After removing NOM, the rates were decreased to 0.047 d^{−1}, 0.037 d^{−1} and 0.066 month^{−1}; in the sediments removed NOM and HMO, the rates were increased to 0.067 d^{−1}, 0.059 d^{−1} and 0.086 month^{−1}. These results indicated that NOM in the sediments accelerated the anaerobic degradation of γ-666, p,p'-DDT and HCB; the HMO inhibited the anaerobic degradation of γ-666, p,p'-DDT and HCB. Show more

Keywords: lindane, p,p'-DDT, HCB, anaerobic degradation, sediments, natural organic matters

Citation: Journal of Environmental Sciences, vol. 15, no. 5, pp. 618-621, 2003

Authors: ZHAO, Xu | QUAN, Xie | ZHAO, Ya-zhi | ZHAO, Hui-min | CHEN, Shuo | CHEN, Jing-wen

Article Type: Research Article

Abstract: Heterogeneous photocatalytic degradation of γ-HCH on soil surfaces was carried out to evaluate the photocatalytic effectiveness of α-Fe_2 O_3 and TiO_2 toward degrading γ-HCH on soil surfaces. After being spiked with γ-HCH, soil samples were loaded with α-Fe_2 O_3 or TiO_2 and exposed to UV-light irradiation. Different catalyst loads (0%, 2%, 5%, 7%, and 10% (wt). α-Fe_2 O_3 ; 0%, 0.5%, 1%, 2% wt). TiO_2 were tested for up to 7 d irradiation. The effects of soil thickness, acidity, and humic substances were also investigated. The obtained results indicated that the γ-HCH photodegradation follows the pseudo-first-order kinetics. The addition of …α-Fe_2 O_3 or TiO_2 accelerates the photodegradation of γ-HCH, while the photodegradation rate decreases when the content of α-Fe_2 O_3 exceeds 7%(wt.). The degradation rate increases with the soil pH value. Humic substances inhibit the photocatalytic degradation of γ-HCH. Pentachlorocyclohexene, tetrachlorocyclohexene, and trichlorobenzene are detected as photodegradation intermediates, which are gradually degraded with the photodegradation evolution. Show more

Keywords: photocatalytic degradation, γ-HCH, soil surfaces, α-Fe_2O_3, TiO_2

Citation: Journal of Environmental Sciences, vol. 16, no. 6, pp. 938-941, 2004

Authors: CHEN, Jing | WANG, Xue-jun | HU, Jun-dong | XU, Fu-liu | TAO, Shu

Article Type: Research Article

Abstract: In this paper, the influences of inionic surfactant Tween80 on polycyclic aromatic hydrocarbons (PAHs) sorption/desorption on artificially contaminated soil were studied, and γ model was applied to simulate the influences. Results showed that, with the use of Tween 80, the sorption behaviors of PAHs on soil altered significantly. Adsorbed Tween 80 increased the sorption amount of PAHs while the dissolved Tween80 increased the apparent solubility of PAHs. These two processes exert influences on the sorption coefficient of PAHs in soil-water system, which can be depicted by apparent sorption coefficient. The partition coefficients (the soil/water partition coefficient of PAHs and surfactants …obtained from sorption experiments) and statistical parameters used in the amended γ model were obtained in independent experiments. With these parameters, the γ model could provide a satisfactory independent prediction of PAHs release from soil to aqueous phase at two surfactant concentrations. Show more

Keywords: Tween80, PAHs, soil, sorption/desorption, γ model

Citation: Journal of Environmental Sciences, vol. 18, no. 4, pp. 716-720, 2006