| Pollution by phthalic acid esters and heavy metals in plastic film in soil-soybean system |
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| DOI：10.7606/j.issn.1000-7601.2012.01.08 |
| Key Words: plastic films heavy metal phthalic acid esters soil soybean |
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| Abstract: |
| A pot experiment was conducted to study the different contents of dibutyl phthalate (DBP),ethylhexyl phthalate (DEHP), Pb, Cd, soybean growth and quality in soil and plants in the growth periods with different
residual amount of mulching plastic film. According to the experiment, the contents of DBP and DEHP in high residual mulching film samples are higher than in low ones and the difference is obvious. In the soil treated with CK, the contents of DBP and DEHP decline obviously along the plants’ growth, but the contents climb up in 1-times, 3-times and 5-times residual amount of mulching plastic film. DBP and DEHP contents are in linear relationship in the result with different periods. According to the PAEs control limits of USA, the contents of DBP and DEHP are not exceeded except CK processing soil samples and the content of DEHP in 1-times processing soil sample. The content of DBP is several times over the standard and the highest one exceeds 6.4 times and DEHP is few times over standard. The contents of DBP and DEHP are lower than the PAEs (USA) standards. The DEHP is not discovered in the plants. In every growth period the contents of Pb and Cd are higher in high residual mulching film than in lower ones. The content of Pb and Cd in soybean seed is far lower than the standard of “food contamination standard” and the heavy metal content is safe in soybean seed with potted conditions. The contents of growth, water, Cd, protein and fat are not sifnificant w
ith differentky residual mulching film. |
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