Phytoremediation of arsenic contaminated mine tailings
The objectives of this study were to compare the bioavailability of arsenic (As) to plants in an As- spiked agricultural soil and a naturally contaminated soil (mine tailings), to evaluate the ability of various chemical amendments to solubilize As in naturally contaminated soils, and to examine the ability of Brassica juncea (Indian mustard) plants in removing the solubilized As from the soil. The growth media used for this study included waste soil from a gold mine in Fiji (mine tailings) contaminated with As (683 As rng/kg) due to the presence of arsenopyrite in the mined rock, and a pasture soil from New Zealand (Manawatu sandy loam) amended with As in the presence or absence of lime. In a separate batch experiment, the ability of a number of chemical extractants to solubilize As was examined using the naturally contaminated Fiji soil. The results indicate that hydrochloric acid (HCl) and a mixture containing ammonium oxalate (NH<,4>O<,x>), oxalic acid and ascorbic acid were effective in extracting As In the plant growth experiment, the solutions of these two chemicals were used as soil amendments to increase As uptake by 8-weeks-old, actively growing B. juncea plants. Arsenic bioavailability as a function of the growth media influenced the germination rate of B. juncea, the As concentration in the plants, and the water soluble As concentration in the soil. The total amount of As taken up by B. juncea plants increased approximately 9 folds, with the addition of the amendments. However, the phytoremediation capacity of B. juncea for As extraction in Fiji soil was too low for efficient soil remediation even in the presence of solubilizing chemicals.
Arsenic Brassica juncea bioavailability extraction Fiji
Byong-Gu Ko Nanthi S. Bolan Christopher W. N. Anderson Keun-Young Huh Iris Vogeler
National Institute of Agricultural and Science Technology, 249 Seodundong Suwon, Republic of Korea I Institute of Natural Resources, Massey University, Private Bag 11 222 Palmerston North, New Zealand Institute of Natural Resources, Massey University, Private Bag 11 222 Palmerston North, New Zealand HortResearch, Tennent Drive, Private Bag 11 030 Palmerston North, New Zealand
国际会议
第九届痕量元素生物地球化学国际会议(9th International Conference on the Biogeochemistry of Trace Elements)
北京
英文
908-910
2007-07-15（万方平台首次上网日期，不代表论文的发表时间）