title: Acceleration of selenium volatilization in seleniferous agricultural drainage sediments amended with methionine and casein.
abstract: 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 4.78microgSeg(-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 25microgm(-2)d(-1) in all plots. After amending the sediment with 71.4mgmethioninekg(-1) soil, Se volatilization rates were 434+/-107microgm(-2)d(-1) in vegetated plots and 289+/-117microgm(-2)d(-1) in irrigated bare plots. With the amendment of 572mgcaseinkg(-1) soil, rates increased to 346+/-103microgm(-2)d(-1) in irrigated bare plots and to 114+/-55microgm(-2)d(-1) in vegetated plots. Both methionine and casein promoted biological remediation of Se via volatilization most effectively during the warmest months.
authors: USDA-ARS, Water Management Research Laboratory, Parlier, CA 93648, USA. gbanuelos@fresno.ars.usda.gov
authors: G S
authors: GS
authors: Bañuelos
authors: Z-Q
authors: ZQ
authors: Lin
mesh_terms: D000383:Agriculture; D001673:Biodegradation, Environmental; D002140:California; D002364:Caseins / Q000737:chemistry*; D008715:Methionine / Q000737:chemistry*; D006109:Poaceae / Q000502:physiology; D012643:Selenium; D012987:Soil / Q000032:analysis; D012989:Soil Pollutants; D014835:Volatilization; D014874:Water Pollutants, Chemical
chemical_list: D002364:Caseins; D012987:Soil; D012989:Soil Pollutants; D014874:Water Pollutants, Chemical; D008715:Methionine; D012643:Selenium