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| Pollution of Phthalic Acid Esters（PAEs） in Vegetable Soils in Xianyang Suburbs, Northwest China |
| Received:April 07, 2014 |
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| KeyWord:phthalic acid esters;pollution;vegetable soil;Xianyang suburbs |
| Author Name | Affiliation | E-mail | | XU Xue | College of Tourism and Environment, Shaanxi Normal University, Xi'an 710062, China | | | WANG Li-jun | College of Tourism and Environment, Shaanxi Normal University, Xi'an 710062, China | wanglijun@snnu.edu.cn | | LU Xin-wei | College of Tourism and Environment, Shaanxi Normal University, Xi'an 710062, China | |
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| Abstract: |
| Soil pollution by phthalic acid esters(PAEs) has become widespread. In the present study, a total of 59 topsoil samples were collected from four selected vegetable fields in Xianyang suburbs. High Performance Liquid Chromatography(HPLC) was used to analyze the concentrations of six PAEs, namely, di- methyl phthalate(DMP), di-ethyl phthalate(DEP), di-n-butyl phthalate(DnBP), benzyl butyl phthalate(BBP), di-(2-ethylehexyl) phthalate(DEHP) and di -n-octyl phthalate(DnOP), which have been listed as priority pollutants by United State Environmental Protection Agency(US EPA). Composition and distribution, environmental sources and pollution levels of PAEs in soils were also studied. All six PAEs were detected in vegetable soils. The detection frequency was in order of DMP(100%)=DnBP(100%)>DEHP(98%)>BBP(80%)>DnOP(66%)>DEP(52%). The concentrations of individual PAE compound varied from no detectable to 6 313.36 μg·kg-1 and their contents were DnBP>DEHP>DMP>DnOP>BBP>DEP. The total content of six PAEs(Σ6PAEs) ranged from 128.60 μg·kg-1 to 10 288.42 μg·kg-1, with an average of 632.10 μg·kg-1, and followed in order of Caojiazhai soils>Guocun soils>Baxingtan soils>Dongzhang soils. Compared to the results of other studies, the contents of PAEs in vegetable soils in Xianyang suburbs were in the middle level. Soil PAEs were dominated by DnBP, DEHP and DMP. Principal component analysis and cluster analysis indicated that DEHP and DnBP came mainly from the use of plastic film, and that DMP, DEP, DnOP and BBP were associated with cosmetics, personal care products and home decoration materials. Per the standard of control and cleanup of soil PAEs used in New York, US, the concentrations of DMP and DnBP in 100% and 85% soil samples exceeded the control standard values, but below the cleanup standard values. |
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