RESUMO
A rapid on-line non-chromatographic hydride generation atomic fluorescence spectrometry is described and determination of inorganic arsenic (iAs (III) and iAs (V)) species is achieved within a single run. Thioglycolic acid (TGA) was used for on-line pre-reduction of iAs (V) and quantification of arsenic species was accomplished via calibration with one As form; as iAs (III). Samples and calibration standards were prepared in Tris buffer (pH:7.2) for selective hydride generation and without on-line pre-reduction, iAs (V) signal was negligible up to 150â¯ngâ¯ml-1. The limit of detection (LOD) values for iAs (III) and iAs (V) were 27â¯pgâ¯ml-1 and 36â¯pgâ¯ml-1, respectively. Recovery studies were performed, certified reference material (TMDA-61) was used to test the accuracy of the method and the results were in good agreement. iAs (V) was the main form in all water samples whereas iAs (III) concentration was Assuntos
Arsênio/análise
, Arsênio/química
, Água Potável/química
, Espectrometria de Fluorescência/métodos
, Poluentes Químicos da Água/análise
, Poluentes Químicos da Água/química
, Limite de Detecção
, Fatores de Tempo