Bioconcentration of atrazine and chlorophenols into roots and shoots of rice seedlings.
Accumulation of o-chlorophenol (CP), 2,4-dichlorophenol (DCP), and atrazine (ATR), as single and mixed contaminants, from hydroponic solutions into roots and shoots of rice seedlings was studied following 48-h exposure of the plant roots. As single contaminants at low levels, the observed bioconcentration factors (BCFs) of CP and DCP with roots approximated the equilibrium values according to the partition-limited model. The BCF of atrazine with roots was about half the partition limit for unknown reasons. The BCFs of CP and ATR with shoots also approximated the partition limits, while the BCF for more lipophilic DCP with shoots was about half the estimated limit, due to insufficient water transport into plants for DCP. As mixed contaminants at low levels, the BCFs with both roots and shoots were comparable with those for the single contaminants; at high levels, the BCFs generally decreased because of the enhanced mixed-contaminant phytotoxicity, as manifested by the greatly reduced plant transpiration rate.
Su
Yu-Hong
YH
Research Center for Eco-environmental Sciences, Chinese Academy of Sciences, 18 Shuangqing Road, Beijing 100085, China.
Zhu
Yong-Guan
YG
D000871:Anthelmintics / Q000032:analysis; D001280:Atrazine / Q000032:analysis* / Q000493:pharmacokinetics; D002733:Chlorophenols / Q000032:analysis* / Q000493:pharmacokinetics; D005506:Food Contamination; D006540:Herbicides / Q000032:analysis* / Q000493:pharmacokinetics; D008954:Models, Biological; D012275:Oryza / Q000737:chemistry* / Q000378:metabolism; D018517:Plant Roots / Q000737:chemistry / Q000378:metabolism; D018520:Plant Shoots / Q000737:chemistry / Q000378:metabolism; D018526:Plant Transpiration / Q000502:physiology; D012639:Seeds / Q000737:chemistry / Q000378:metabolism; D014867:Water / Q000737:chemistry
D000871:Anthelmintics; D002733:Chlorophenols; D006540:Herbicides; D014867:Water; C030683:2-chlorophenol; D001280:Atrazine; C004762:2,4-dichlorophenol