Acceleration of selenium volatilization in seleniferous agricultural drainage sediments amended with methionine and casein
2007
Bañuelos, G.S. | Lin, Z.Q.
Phytoremediation is potentially effective for managing excessive selenium (Se) in drainage sediment residing in the San Luis Drain in central California. This 2-year field study examined the feasibility of amending drainage sediment (containing 4.78 mg Se g 1) with methionine and casein to enhance volatilization without or with vegetation of Sporobolus airoides. Results show that without organic amendments, rates of Se volatilization were less than 25 mgm 2 d 1 in all plots. After amending the sediment with 71.4 mg methionine kg 1 soil, Se volatilization rates were 434 107 mgm 2 d 1 in vegetated plots and 289 117 mgm 2 d 1 in irrigated bare plots.With the amendment of 572 mg casein kg 1 soil, rates increased to 346 103 mgm 2 d 1 in irrigated bare plots and to 114 55 mgm 2 d 1 in vegetated plots. Both methionine and casein promoted biological remediation of Se via volatilization most effectively during the warmest months.
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