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| Effects of plastic film mulching on phthalate esters accumulation in farmland soil and maize grain |
| Received:January 09, 2020 |
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| KeyWord:phthalates;degradable mulch;field mulch treatments;soil;maize |
| Author Name | Affiliation | E-mail | | LI Jin | School of Life Sciences, Lanzhou University, Lanzhou 730000, China | | | ZHOU Tao | Gansu Agroecology and Resource Protection Technology Extension General Station, Lanzhou 730000, China | | | ZHANG Yang | Gansu Analyze and Research Center, Lanzhou 730000, China | | | LI Liu-biao | School of Life Sciences, Lanzhou University, Lanzhou 730000, China | | | LI Chong-xiao | Gansu Agroecology and Resource Protection Technology Extension General Station, Lanzhou 730000, China | | | CAO Jing | School of Life Sciences, Lanzhou University, Lanzhou 730000, China | caojing@lzu.edu.cn |
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| Abstract: |
| In order to investigate the residue and accumulation of PAEs in soil-plant systems, PAE contents of plastic films with different thicknesses(0.012, 0.010, and 0.008 mm)and with different types of degradation were determined. Different methods of film treatment (landfill and exposure)were tested, and the resulting PAE residues in the soil, and their evolution over time, were compared. The effects of different mulching periods(5, 15, and 25 years)on the accumulation of PAEs in soil and maize grains were analyzed through field experiments. The results show that PAEs content in 0.012 mm plastic mulch is higher than that of 0.008 mm plastic mulch and the PAEs contents of degradable plastic mulch are higher than those of non-degradable PE mulch. Five PAE congeners were detected, namely DMP, DEP, DBP, DEHP, and DNOP. Plastic mulch had higher contents of DBP and DEHP than of any other congeners. After a 90-day field treatment, the PAEs contents of soil with different degradation types of plastic film in landfill treatments was, on average, 1.49 times higher than those of exposure treatments, indicating that soil PAEs content was affected by the method of plastic film treatment. With the extension of mulching planting time, the accumulation of PAEs in cornfield soil increased, with DBP and DEHP accumulation increasing most significantly. Of the PAE congeners, only DBP was detected in maize grains, and a significant positive correlation was found between the PAE contents of soil and maize. |
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