【摘要】 土壤pH、硝酸根离子浓度、土壤外源性Cu2+污染、土壤中草酸或柠檬酸浓度等环境因素可能会影响邻苯二甲酸二丁酯（DnBP）在土壤中的化学降解行为,为研究这些环境因素如何影响DnBP的降解,采集江西鹰潭红壤,加入DnBP老化30 d,在光照（300～400 nm）和暗环境下分别研究环境因素对DnBP在土壤泥浆中降解的影响。结果表明:当土壤中目标污染物DnBP浓度为100 mg?kg^-1时,在土壤pH为3.5、草酸浓度为50 mmol?L^-1的条件下,DnBP降解率为95%。草酸浓度过高或过低均不利于DnBP的降解。柠檬酸对DnBP降解的影响次于草酸。低pH的酸性环境下草酸有利于红壤中DnBP的光降解。以Cu2+污染为例的复合污染,无论在有或无草酸存在的条件下均对DnBP的降解无显著影响。在纯水溶液中,25 mmol?L^-1的NO3-有效地利用300～400 nm的紫外光降解DnBP,然而在土壤泥浆中NO3-的存在并不影响DnBP降解。研究表明,在表层红壤接受光照的情况下,有机污染物DnBP可以在红壤中发生光催化降解。更多还原

【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 ofDnBP. 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 havebeen few studies that have examined these effects. In this study,soil collected from Yingtan in Jiangxi Province was used to examine DnBPester degradation both in the dark and under UV irradiation,as affected by the aforementioned different environmental factors. In soil witha 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 approximate95% degradation of DnBP. Oxalic acid concentrations higher or lower than 50 mmol?L^-1 resulted in a lower degradation ratio of DnBP. Theaddition of citric acid to soil was less effective than that of oxalic acid. An acidic environment in the presence of oxalic acid and irradiationwith UV（300～400 nm）light was observed to be beneficial for DnBP degradation. In pure aqueous solutions containing 25 mmol?L^-1 of theinorganic anion NO-3,DnBP is readily decomposed under UV irradiation. However,in soil suspensions,NO-3 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.更多还原