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Xueli Wang
Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region, Ministry of Education, Chang'an University, Xi'an 710054, China

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Journal article
Published: 30 December 2019 in International Journal of Environmental Research and Public Health
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The sorption of hexabromocyclododecanes (HBCDs) on sediment affects the fate and transport of HBCDs in rivers. The sorption of HBCDs on sediment from the Weihe River was investigated by performing batch equilibration experiments, and the effects of changing the pH ionic, strength, and humic acid concentration (HA) on sorption were evaluated. The obtained results indicated that fast rather than slow sorption was the dominant process. Nonlinear sorption isotherms were acquired, and the Freundlich (R2 0.94–0.98) and Langmuir (R2 0.95–0.99) models both described the sorption of HBCDs well. The adsorption capacity for α-HBCD, β-HBCD, and γ-HBCD were calculated using the Langmuir model, and were 443.56, 614.29 and 1146.37 mg/kg, respectively. Thermodynamic analysis shows that HBCDs sorption on sediment is a spontaneous exothermic process. HBCDs sorption was affected by the HA concentration and ionic strength. The amounts of HBCDs sorbed to the sediment decreased as the ionic strength increased, and first increased and then decreased as the HA concentration increased. Changes in pH did not clearly affect the sorption of HBCDs. Synchrotron radiation Fourier-transform infrared spectra (SR-FTIR) was used to characterize the adsorption mechanism, and the obtained result indicated that hydrophobic interactions dominated the mechanism involved in HBCDs sorption on sediment.

ACS Style

Xueli Wang; Xiaoyu Yuan; Shengke Yang. Sorption Behavior of Hexabromocyclododecanes (HBCDs) on Weihe River Sediment. International Journal of Environmental Research and Public Health 2019, 17, 247 .

AMA Style

Xueli Wang, Xiaoyu Yuan, Shengke Yang. Sorption Behavior of Hexabromocyclododecanes (HBCDs) on Weihe River Sediment. International Journal of Environmental Research and Public Health. 2019; 17 (1):247.

Chicago/Turabian Style

Xueli Wang; Xiaoyu Yuan; Shengke Yang. 2019. "Sorption Behavior of Hexabromocyclododecanes (HBCDs) on Weihe River Sediment." International Journal of Environmental Research and Public Health 17, no. 1: 247.

Journal article
Published: 23 October 2018 in International Journal of Environmental Research and Public Health
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As one of the most widely used brominated flame retardants, hexabromocyclododecane (HBCD) is found widely in the environmental media. In this study, the content and spatial distribution of HBCD and risk posed by HBCD in surface sediment in the Weihe River Basin in Northwest China were investigated. The HBCD concentration ranged nd–4.04 ng/g dw with the mean was 0.45 ng/g dw. The major source of HBCD in surface sediment was local point discharge. The distribution profiles of α-, β-, γ-HBCD were 24.7–87.9%, 0–42.0%, and 0–67.1%, respectively. Specially, α-HBCD was the dominating isomer in most sample sites. This differed significantly from that in HBCD technical product, which might be attributed to the different degradation rates and inter-transformation of the three HBCD isomers. Risk quotient method was used to assess the potential risk posed by HBCD in sediment. HBCD do not pose strong risks to aquatic algae organisms in the Weihe River Basin.

ACS Style

Xueli Wang; Xiaoyu Yuan; Shengke Yang; Yaqian Zhao. Concentrations, Distributions, and Risk Assessment of HBCD in Sediment in the Weihe River Basin in Northwest China. International Journal of Environmental Research and Public Health 2018, 15, 2340 .

AMA Style

Xueli Wang, Xiaoyu Yuan, Shengke Yang, Yaqian Zhao. Concentrations, Distributions, and Risk Assessment of HBCD in Sediment in the Weihe River Basin in Northwest China. International Journal of Environmental Research and Public Health. 2018; 15 (11):2340.

Chicago/Turabian Style

Xueli Wang; Xiaoyu Yuan; Shengke Yang; Yaqian Zhao. 2018. "Concentrations, Distributions, and Risk Assessment of HBCD in Sediment in the Weihe River Basin in Northwest China." International Journal of Environmental Research and Public Health 15, no. 11: 2340.

Journal article
Published: 03 September 2018 in International Journal of Environmental Research and Public Health
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In this study, the interaction between the humus and two antibiotics was studied by UV-Vis spectroscopy to describe the interaction mechanism and the effects of different environmental factors on the mechanism. Results showed that humic acid (HA) containing more aromatic groups was easily associated with antibiotics. In the HA-OTC, with the increase of the concentration of OTC, there were obvious absorption peaks in the 230–260 nm and 330–360 nm range, and the absorption band of the HA ultraviolet spectrum underwent a slight blue shift and the absorption intensity increased, demonstrating that a new ground state complex was generated. In the HA-SD, with the increase of SD concentration, an aromatic structure absorption peak appeared in the 190–220 nm range, and the peak value increased and the absorption band underwent a red shift, and the aromatization of HA decreased, which enhanced the interaction between the antibiotics and HA. With the increase of pH, the absorption band of HA, HA-OTC and HA-SD ultraviolet spectrum suffered a blue shift, the degree of polymerization of HA molecules decreased, and the number of adsorption binding sites increased, which resulted in the interaction of HA with antibiotics being enhanced. The absorption band of HA, HA-OTC and HA-SD displayed a red shift with the increase of ionic strength, which indicated that the repulsion within HA particles was weakened, and the molecular polymerization was strengthened and therefore, the interaction between antibiotics and HA was inhibited. The UV characteristics of the HA, HA-OTC and HA-SD systems were insensitive to the temperature. This study lays the foundation for better studying the effect of humus on the distribution of antibiotic residues in the environment.

ACS Style

Xiaoyu Yuan; Shengke Yang; Jie Fang; Xueli Wang; Haizhen Ma; Zongzhou Wang; Runze Wang; Yaqian Zhao. Interaction Mechanism between Antibiotics and Humic Acid by UV-Vis Spectrometry. International Journal of Environmental Research and Public Health 2018, 15, 1911 .

AMA Style

Xiaoyu Yuan, Shengke Yang, Jie Fang, Xueli Wang, Haizhen Ma, Zongzhou Wang, Runze Wang, Yaqian Zhao. Interaction Mechanism between Antibiotics and Humic Acid by UV-Vis Spectrometry. International Journal of Environmental Research and Public Health. 2018; 15 (9):1911.

Chicago/Turabian Style

Xiaoyu Yuan; Shengke Yang; Jie Fang; Xueli Wang; Haizhen Ma; Zongzhou Wang; Runze Wang; Yaqian Zhao. 2018. "Interaction Mechanism between Antibiotics and Humic Acid by UV-Vis Spectrometry." International Journal of Environmental Research and Public Health 15, no. 9: 1911.

Journal article
Published: 24 July 2018 in Chemosphere
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There is great concern about decreasing the amounts of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) that are formed and emitted during the chlorine bleaching of pulp. The formation of PCDD/Fs during non-woodpulp chlorine bleaching was investigated in the study described here. Wheat straw was separated into three components, cellulose, hemicellulose, and lignin. Chlorination experiments were performed, and lignin and hemicellulose contributed more than cellulose to PCDD/F formation when the pulp was bleached using chlorine. The chemical components of lignin were identified by gas chromatography mass spectrometry, and nine possible PCDD/F precursors were quantified by gas chromatography tandem mass spectrometry. Spiked chlorination experiments were performed to investigate the effects of these compounds on PCDD/F formation. 4-Ethyl-2-methoxyphenol had the strongest effect on PCDD/F formation, followed by p-chlorophenol, and guaiacol. All the test compounds promoted polychlorinated dibenzofuran formation but had limited effects on polychlorinated dibenzo-p-dioxin formation. The results allowed mechanisms for the formation of PCDD/Fs from phenol, chlorophenol, catechol, and guaiacol to be proposed.

ACS Style

Xueli Wang; Jiping Chen; Yuwen Ni. Polychlorinated dibenzo-p-dioxin and dibenzofuran precursors and formation mechanisms during non-woodpulp chlorine bleaching process. Chemosphere 2018, 211, 1 -9.

AMA Style

Xueli Wang, Jiping Chen, Yuwen Ni. Polychlorinated dibenzo-p-dioxin and dibenzofuran precursors and formation mechanisms during non-woodpulp chlorine bleaching process. Chemosphere. 2018; 211 ():1-9.

Chicago/Turabian Style

Xueli Wang; Jiping Chen; Yuwen Ni. 2018. "Polychlorinated dibenzo-p-dioxin and dibenzofuran precursors and formation mechanisms during non-woodpulp chlorine bleaching process." Chemosphere 211, no. : 1-9.