title: Arsenic determination in marine sediment using ultrasound for sample preparation.
abstract: This work deals with As determination in marine sediment using ultrasound for sample preparation. It is shown that As can be quantitatively extracted from marine sediment using 20% (v/v) HCl and sonication. The slurry is centrifuged and the analyte is determined in the supernatant by hydride generation atomic absorption spectrometry (HG AAS). A flow injection (FI) system is employed for hydride generation, with 0.5% (m/v) NaBH(4) used as reducdant and a 20% (v/v) HCl used as sample carrier. The limit of quantification is 1.6 microg g(-1) of As, which is based on 800 microl of sample solution and 0.200 g of sample mass in a volume of 50 mL. Certified and non certified marine sediment samples were analyzed; the results were in accordance with the certified or reference values. Speciation analysis by HPLC-ICP-MS showed that As(V) is the only detectable As species present in the supernatant of the centrifuged sample.
authors: Instituto de Química, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brasil.
authors: Fabrina R S
authors: FR
authors: Bentlin
authors: Fábio A
authors: FA
authors: Duarte
authors: Valderi L
authors: VL
authors: Dressler
authors: Dirce
authors: D
authors: Pozebon
mesh_terms: D053000:Analytic Sample Preparation Methods / Q000379:methods*; D001151:Arsenic / Q000032:analysis*; D001894:Borohydrides; D002851:Chromatography, High Pressure Liquid; D019015:Geologic Sediments / Q000737:chemistry*; D006851:Hydrochloric Acid; D013058:Mass Spectrometry; D017942:Nitric Acid; D013010:Sonication / Q000295:instrumentation*
chemical_list: D001894:Borohydrides; D017942:Nitric Acid; C025364:sodium borohydride; D001151:Arsenic; D006851:Hydrochloric Acid