PHTHALATE ESTERS MIGRATION FROM TWO KINDS OF PLASTIC FILMS AND THE ENRICHMENT IN PEANUT PLANT

摘要

Agricultural plastic films are widely used as an important measure to promote peanut yield; however, pollution by phthalate esters (PAEs) subsequently migrating from agricultural plastic films is not well understood. The present study investigated the migration of PAEs from two kinds of agricultural plastic films (white polyethylene film and black recycled plastic film) as well as the absorption and accumulation characteristics of dibutyl phthalate (DBP) and di-(2-ethylhexyl) phthalate (DEHP) by two peanut varieties in pot experiments. The results showed:a. DBP and DEHP concentrations in soils increased with the increase in amount of agricultural plastic films applied.b. residual concentrations of DBP and DEHP in soils with black recycled plastic film applied were greater than with white polyethylene film treatment, andc. regardless of the type of film applied, DBP and DEHP residual concentrations were reduced significantly with time in all treatments except for the control.The proportion of DBP accumulated by two peanut varieties relative to the total amount DBP applied in soils was 0.01-0.03, and that of DEHP was 0.02-0.04. DBP and DEHP concentrations in peanut kernels were significantly higher than those of root, but not pods, showing that PAE absorption by roots, but not pods, was an important mechanism in determining PAE accumulation.