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| Effects of environmental factors on the degradation of di-butyl phthalate (DnBP)in a simulated red soil mud system under UV (300~400 nm)irradiation |
| Received:April 12, 2018 Revised:August 08, 2018 |
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| KeyWord:di-butyl phthalate;degradation;UV light;red soil;oxalic acid;citric acid |
| Author Name | Affiliation | E-mail | | SHUAI Wen-juan | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
University of Chinese Academy of Science, Beijing 100049, China | | | FANG Guo-dong | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | ZHOU Dong-mei | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | GAO Juan | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | juangao@issas.ac.cn |
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| Abstract: |
| Di-butyl phthalate (DnBP)is a widely used plasticizer with endocrine-disrupting properties and is presently widely detected in soils. Surface soil absorbs long-wavelength UV irradiation (300~400 nm)that can induce a series of reactions leading to the degradation of DnBP. Moreover, spatial and/or temporal differences in environmental factors, such as soil pH, nitrate concentration, soil exogenous Cu2+ pollution, and soil solution contents of oxalic acid or citric acid, can also influence the nature of DnBP in soils. To date, however, there have been few studies that have examined these effects. In this study, soil collected from Yingtan in Jiangxi Province was used to examine DnBP ester degradation both in the dark and under UV irradiation, as affected by the aforementioned different environmental factors. In soil with a solution pH of 5.5, oxalic acid concentration of 50 mmol·L-1, and initial DnBP concentration of 100 mg·kg-1, there was an approximate 95% degradation of DnBP. Oxalic acid concentrations higher or lower than 50 mmol·L-1 resulted in a lower degradation ratio of DnBP. The addition of citric acid to soil was less effective than that of oxalic acid. An acidic environment in the presence of oxalic acid and irradiation with UV (300~400 nm)light was observed to be beneficial for DnBP degradation. In pure aqueous solutions containing 25 mmol·L-1 of the inorganic anion NO3-, DnBP is readily decomposed under UV irradiation. However, in soil suspensions, NO3- had no effect on the degradation of DnBP. This study verified that organic pollutants such as DnBP can be degraded by chemical reactions occurring in the top layer of soil. |
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