Development of an on line miniaturized non-chromatographic arsenic speciation system☆

: PEDRO R. ARANDA, MARCOS SEIA, LUIS DANTE MARTINEZ, SUSANA MOYANO, IRMA E. DE VITO.; PABLO PACHECO; ARIEL MARATTA,

MICROCHEMICAL JOURNAL

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 2016 vol. 127 p. 199 - 205

0026-265X

An arsenic speciation method is proposed introducing selective hydride generation, UV photooxidation and hydridetrapping on oxidizedmultiwall carbon nanotubes (CNTs)with electrothermal atomic absorption spectrometry(ETAAS) for detection. To this end a flow injection system was designed to focus on miniaturization with minimal reagent consumption. As a result reagent consumption was kept in μL level with no need of carrier gas for hydride transport. This study obtained an enhancement factor of 60 when 2 mL of sample were loaded in the gas?liquid separator, arsine adsorbed on CNTs, and eluted with 30 μL of 5%HNO3 (v v−1). A limit of detection (LoD) of 0.78 ng L−1 was obtained. The precision was evaluated by relative standard deviation (RSD%) corresponding to 8.3% (n=10). Themethod determined organic and inorganic arsenic fractions; and As3+ and As5+ concentrations in well and cistern water samples from arsenic endemic regions of Argentina.© 2016 Elsevier B.V. All rights reserved.