Abstract:
:Significant cadmium (Cd) contamination In soil and rice has been discovered in Mae Sot, Tak province, Thailand where the rice-based agricultural systems are established in the vicinity of a zinc mine. The prolonged consumption of Cd contaminated rice has potential risks to public health and health impacts of Cd exposed populations in Mae Sot have been demonstrated. The Thai government has prohibited rice cultivation in the area as an effort to prevent further exposure. Phytoextraction, the use of plants to remove contaminants from soil, is a potential option to manage Cd-contaminated areas. However, successful phytoextraction depends on first identifying effective hyperaccumulator plants appropriate for local climatic conditions. Five sampling sites at Padaeng Zinc mine, Tak province were selected to collect plant and soil samples. Total Cd and Zn concentrations in sediments or soils were approximately 596 and 20,673 mg kg(-1) in tailing pond area, 543 and 20,272 mg kg(-1) in open pit area, 894 and 31,319 mg kg(-1) in stockpile area, 1458 and 57,012 mg kg(-1) in forest area and 64 and 2733 mg kg(-1) in Cd contaminated rice field. Among a total of 36 plant species from 16 families, four species (Chromolaena odoratum, Gynura pseudochina, Impatiens violaeflora and Justicia procumbens) could be considered as Cd hyperaccumulators since their shoot Cd concentrations exceeded 100 mg Cd kg(-1) dry mass and they showed a translocation factor >1. Only Justicia procumbens could be considered as a Zn hyperaccumulator (Zn concentration in its shoot more than 10,000 mg Zn kg(-1) dry mass with the translocation factor >1).
journal_name
Int J Phytoremediationjournal_title
International journal of phytoremediationauthors
Phaenark C,Pokethitiyook P,Kruatrachue M,Ngernsansaruay Cdoi
10.1080/15226510802656243subject
Has Abstractpub_date
2009-07-01 00:00:00pages
479-95issue
5eissn
1522-6514issn
1549-7879journal_volume
11pub_type
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journal_title:International journal of phytoremediation
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journal_title:International journal of phytoremediation
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journal_title:International journal of phytoremediation
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journal_title:International journal of phytoremediation
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