Phytoaccumulation of Arsenic from Arsenic Contaminated Soils by Eichhornia Crassipes L., Echinochloa Crusgalli L. and Monochoria Hastata L. in Bangladesh
Md. Mokhlesur Rahman; Md. Wahid-Uz-Zaman; Md. Shariful Islam
Arsenic (As) phytoaccumulation study was conducted with three plant species namely Eichhornia crassipes L. (water
hyacinth), Echinochloa crusgalli L. (barnyard grass) and Monochoria hastata L. (water taro) in crop land soils contaminated by
naturally and artificially from sodium arsenite (NaAsO2). Phytoaccumulation of As increased significantly with increasing soil As
levels. In artificially As contaminated soils, highest As concentration was recorded in water hyacinth (67.9 and 46.83 mg kg-1 root and
shoot, respectively) followed by water taro and barnyard grass at 100 mg As kg-1 treated soil. For naturally As contaminated soils, the
highest accumulation of As in barnyard grass (56.93 and 26.50 mg kg-1 root and shoot, respectively) followed by water taro and water
hyacinth in Paranpur soils (116 mg As kg-1 soil). The enrichment factor of arsenic in both artificially and naturally arsenic
contaminated soils, root and shoot parts of these plant species were found to be in the sequence of soil root shoot. In most cases,
arsenic translocation factor of soil to root and root to shoot is 0.5 to 1.0 indicated that main application of these plants is for arsenic
phytoaccumulation from soil. Highest bio-concentration factor (2300) values were found in barnyard grass root than water taro
(2184.55) and water hyacinth (1336.36) and this values always 10 times higher (293-2300) in the plant parts grown in the
contaminated site compare to uncontaminated site. Current study revealed that, these plant species can be used as arsenic
accumulator in arsenic contaminated soils.
Arsenic; Contamination; Bio-concentration Factor; Phytoaccumulation; Soil.