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| Accumulation of Aged HCH-DDT by Corn（Zea mays L.） and Wheat（Triticum aestivum L.） Roots from Soils |
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| KeyWord:aged HCH-DDT; crop roots; soil; accumulation; sequential extraction |
| Author Name | Affiliation | | ZHANG Fu-jin | College of Life Sciences, Inner Mongolia University, Hohhot 010021, China
3.Inner Mongolia Academy of Agriculture and Animal Husbandry, Hohhot 010031, China | | HE Jiang | College of Life Sciences, Inner Mongolia University, Hohhot 010021, China
College of Environment and Resources, Inner Mongolia University, Hohhot 010021, China | | LU Chang-wei | College of Environment and Resources, Inner Mongolia University, Hohhot 010021, China | | HOU De-kun | College of Life Sciences, Inner Mongolia University, Hohhot 010021, China
College of Environment and Resources, Inner Mongolia University, Hohhot 010021, China | | ZHANG Ting-yu | College of Environment and Resources, Inner Mongolia University, Hohhot 010021, China | | ZHANG Min | College of Environment and Resources, Inner Mongolia University, Hohhot 010021, China | | Khureldavaa Otgonbayar | College of Life Sciences, Inner Mongolia University, Hohhot 010021, China | | ZHANG Xin-xin | Inner Mongolia Academy of Agriculture and Animal Husbandry, Hohhot 010031, China |
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| Abstract: |
| Organochlorine pesticides（OCPs） in soils may still impact plants though their uses were stopped 30 years ago. In this study, the accumulation of aged HCH-DDT by corn（Zea mays L.） and wheat（Triticum aestivum L.） roots from naturally contaminated soil was studied in a pot experiment to access the phyto-bioavailability of aged OCPs. HCH and DDT were extracted sequentially to measure weakly adsorbed，strongly adsorbed，and absorbed fractions in root tissues. The results showed that corn and wheat accumulated aged HCH and DDT selectively. After 60 days of exposure，corn roots strongly adsorbed about 55.4%~62.2% of the total HCH and DDT detected on the root surfaces, but absorbed approximate 23.3%~36.9% into the roots. Wheat roots adsorbed 73.8%~76.9%, but absorbed only 15.4%~20.5% of the HCH and DDT detected. Differences in the ratios of isomers and metabolites were found in different fractions. The absorbed fraction was mainly β-HCH, whereas strong adsorbed fraction was p,p′-DDT, p,p′-DDE and p,p′-DDD. The accumulation of HCH and DDT in crop roots increased, but bioaccumulation factor（BAF） decreased with their concentrations in soils. Wheat roots accumulated HCH and DDT greater than corn roots did. The concentrations of HCH and DDT in crop roots were significantly positively correlated with root specific surface area and total lipid contents. The absorbed fractions of HCH and DDT in root tissues were controlled mainly by total lipid contents. |
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