title: Retention of phenylarsenicals in soils derived from volcanic materials.
abstract: Sorption of phenylarsenicals including 4-hydroxy-3-nitrophenylarsonic acid (roxarsone), an animal feed additive widely used for growth stimulation, on soils was investigated in batch systems. Phenylarsonic acid, o-arsanilic acid and roxarsone were retained differently by unpolluted, non-sterilized soils. Sorption isotherms were analyzed by the Henry, Tóth and Langmuir-Freundlich equations. The saturation capacity of the Acrisol soil was 3.4 for o-arsanilic acid, 10.9 for phenylarsonic acid and 1.9 g(As) kg(soil)(-1) (dry mass) for roxarsone. The iron content in the soil was not the only factor determining retention of the studied phenylarsenicals. The order of retention on the three soils after 24 h was: roxarsone>o-arsanilic acid>phenylarsonic acid. Besides arsenite and arsenate, new arsenic-containing compounds were detected.
authors.affiliation: Centro de Química ICUAP, Universidad Autónoma de Puebla, CU-Edif. 103H, Puebla, Pue. 72570, Mexico.
authors.forename: Uriel
authors.initials: U
authors.lastname: Arroyo-Abad
authors.forename: María P
authors.initials: MP
authors.lastname: Elizalde-González
authors.forename: Claudia M
authors.initials: CM
authors.lastname: Hidalgo-Moreno
authors.forename: Jürgen
authors.initials: J
authors.lastname: Mattusch
authors.forename: Rainer
authors.initials: R
authors.lastname: Wennrich
mesh_terms: D000327:Adsorption; D000465:Algorithms; D001147:Arsanilic Acid / Q000737:chemistry; D001151:Arsenic / Q000737:chemistry; D001152:Arsenicals / Q000737:chemistry*; D002851:Chromatography, High Pressure Liquid; D003890:Desiccation; D006813:Humidity; D007700:Kinetics; D013058:Mass Spectrometry; D012406:Roxarsone / Q000737:chemistry; D012987:Soil / Q000032:analysis; D012989:Soil Pollutants / Q000032:analysis*; D013056:Spectrophotometry, Ultraviolet; D013816:Thermodynamics; D018707:Volcanic Eruptions / Q000032:analysis*
chemical_list: D001152:Arsenicals; D012987:Soil; D012989:Soil Pollutants; D012406:Roxarsone; D001151:Arsenic; D001147:Arsanilic Acid