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| Effects of different soil environmental factors on tetracycline adsorption of microplastics |
| Received:May 05, 2019 |
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| KeyWord:microplastics;tetracycline;adsorption;soil environmental factors |
| Author Name | Affiliation | E-mail | | YANG Jie | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
University of Chinese Academy of Sciences, Beijing 100049, China | | | CANG Long | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | canglong@issas.ac.cn | | QIU Wei | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
University of Chinese Academy of Sciences, Beijing 100049, China | | | YANG Jiang-li | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
University of Chinese Academy of Sciences, Beijing 100049, China | | | ZHOU Dong-mei | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | |
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| Abstract: |
| To investigate the effect of different soil environmental factors on the adsorption of antibiotics on microplastics, this study used three microplastics, i. e., polyethylene(PE), polystyrene(PS), and polyamide(PA), with tetracycline(TC) as the target antibiotic, in a batch equilibrium experiment to study the mechanism of TC adsorption on microplastics and the influence of different soil environmental factors on its adsorption behavior. The results showed that the TC adsorption capacities of the microplastics were in the order PE > PS > PA, and these microplastics were suitable for fitting using Langmuir's equation. The maximum adsorption capacities were 0.154, 0.086, and 0.075 mg·g-1, respectively. The TC adsorption capacity for PE reached the maximum value under neutral pH conditions; for PS, it was the largest under acidic conditions, and it decreased with an increase in pH; and for PA, pH had little effect on TC adsorption capacity. Different concentrations of Ca2+ and Mg2+ hinder the absorption of TC by microplastics, and the cation concentration was inversely proportional to the adsorption capacity. The presence of fulvic acid inhibited the adsorption of TC on PE; however, the presence of low concentration fulvic acid(<1 mg·L-1) promoted the adsorption of TC on PA and PS. In conclusion, the experiments showed that the adsorption of TC on different microplastics was significantly different; furthermore, different soil environmental factors considerably affected the adsorption behavior of TC on microplastics, which lays the foundation for further investigation of the adsorption behavior of microplastics in soil. |
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