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Ying Li
Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region, Ministry of Education, Chang’an University, Xi’an 710054, China;(Y.L.);(J.F.);(X.Y.);(Y.C.);(H.Y.)

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Journal article
Published: 22 August 2018 in International Journal of Environmental Research and Public Health
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To examine the residual and distributions of tetracycline antibiotics in the Weihe River, SPE-UPLC (solid phase extraction-ultra performance liquid chromatography with UV-Vis detection) was employed to analyze the oxytetracycline (OTC), chlortetracycline (CTC), and minocycline (MC) of 41 surface water and 35 sediment samples collected from main streams, tributaries, and main sewage outlets. The results showed that: (1) The order of residual levels of tetracycline antibiotics in water and sediment from high to low was the following: OTC > CTC > MC., considering the water solubilities are 313 mg/L, 630 mg/L, and 50200mg/L and octanol water partition coefficients (Kow) are 7.94, 4.16, and 1.12 for OTC, CTC, and MC, respectively. Thus, the distribution of antibiotics was not only related to the basic properties of antibiotics, but also some environmental factors. The concentrations of OTC in water and sediment were in the range of 1.56–87.89 ng/L and 6.13–45.38 ng/g (mean value of 16.13 ng/L and 20.60 ng/g), respectively; while CTC was 1.07–26.78 ng/L and 6.17–32.29 ng/g (mean value of 4.96 ng/L and 14.48 ng/g), respectively; and MC was 0.28–12.35 ng/L and 4.80–29.74 ng/g (mean value of 1.70 ng/L and 12.96 ng/g), respectively. There were maximum concentrations in all sewage outlets. Compared with other areas in China, tetracyclines residual in the Weihe river were at a medium level; (2) in spatial distribution, the levels of tetracyclines in water and sediment from the middle and upper reaches were higher than the lower reaches. Meanwhile, the sewage outfalls and livestock farm waste water discharge appeared to be the main sources of tetracycline antibiotics in the Weihe River; (3) ecological risk assessment revealed that in main streams and tributaries, OTC and CTC may be at a low ecological risk level; while in sewage outfalls, they may represent a medium ecological risk level.

ACS Style

Ying Li; Jie Fang; Xiaoyu Yuan; Yangyang Chen; HongBin Yang; Xiaohua Fei. Distribution Characteristics and Ecological Risk Assessment of Tetracyclines Pollution in the Weihe River, China. International Journal of Environmental Research and Public Health 2018, 15, 1803 .

AMA Style

Ying Li, Jie Fang, Xiaoyu Yuan, Yangyang Chen, HongBin Yang, Xiaohua Fei. Distribution Characteristics and Ecological Risk Assessment of Tetracyclines Pollution in the Weihe River, China. International Journal of Environmental Research and Public Health. 2018; 15 (9):1803.

Chicago/Turabian Style

Ying Li; Jie Fang; Xiaoyu Yuan; Yangyang Chen; HongBin Yang; Xiaohua Fei. 2018. "Distribution Characteristics and Ecological Risk Assessment of Tetracyclines Pollution in the Weihe River, China." International Journal of Environmental Research and Public Health 15, no. 9: 1803.

Journal article
Published: 23 April 2018 in International Journal of Environmental Research and Public Health
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The sludge from the water supply plant was investigated to remove fluoride ions from the water. To improve the adsorption ability, the original sludge sample was treated with fuel oxidation, pyrolysis, hydrochloric acid, and sulphuric acid methods, and hydrochloric acid treatment improved the adsorption capacity of the sludge on the fluoride in water significantly, with a maximum adsorption capacity to 140 mg/kg. The adsorption experimental data was the well fitted pseudo-first-order model and the Langmuir isotherms model. SEM images and XRD patterns of the adsorbent were recorded to get a better insight into the adsorption process. The effect of three variables, hydrochloric acid treated sludge (HWS) dose, pH, and initial fluoride concentration were studied using a Box-Behnken statistical experimental design. The model of the adsorption and optimum conditions was investigated using the response surface methodology. The optimum removal efficiency of fluoride can reach 81.153% under the optimum condition: HWS dose of 14.10 g/L and pH value at 6.12. The effect of co-existing anions and the removal efficiency from the water were also studied. The results suggest that sludge from the water supply plant can be reused as a coagulant for the removal of fluoride from poor quality water.

ACS Style

Ying Li; Shengke Yang; Qianli Jiang; Jie Fang; Wenke Wang; Yanhua Wang. The Adsorptive Removal of Fluoride from Aqueous Solution by Modified Sludge: Optimization Using Response Surface Methodology. International Journal of Environmental Research and Public Health 2018, 15, 826 .

AMA Style

Ying Li, Shengke Yang, Qianli Jiang, Jie Fang, Wenke Wang, Yanhua Wang. The Adsorptive Removal of Fluoride from Aqueous Solution by Modified Sludge: Optimization Using Response Surface Methodology. International Journal of Environmental Research and Public Health. 2018; 15 (4):826.

Chicago/Turabian Style

Ying Li; Shengke Yang; Qianli Jiang; Jie Fang; Wenke Wang; Yanhua Wang. 2018. "The Adsorptive Removal of Fluoride from Aqueous Solution by Modified Sludge: Optimization Using Response Surface Methodology." International Journal of Environmental Research and Public Health 15, no. 4: 826.