Strategy of Sample Preparation for Arsenic Determination in Mineral Fertilizers
A method for determination of arsenic in mineral fertilizers by continuous flow hydride generation atomic absorption spectrometry (CF-HG-AAS) was developed by using diluted acid and digester block with perfluoroalkoxy (PFA) tubes to sample preparation. An additional sample preparation procedure using microwave-assisted digestion was evaluated and compared with the proposed procedure. A full factorial design was applied to investigate the effect of the variables and the best conditions found were 7 mol L−1 HNO3 + 30% (m/m) H2O2 as reagents, 4 h of digestion and concentration of reagents diluted 1:1. The effect of concomitants on the analytical signal of arsenic was investigated and no one significant interference was observed, with recoveries ranged from 97 to 103%. The accuracy of proposed method was evaluated by certified reference material (NIST SRM 695) and recovery of 95% was obtained. The arsenic concentration (8.9 ± 0.2 mg kg−1) found in the fertilizer is below of maximum concentration established by Brazilian legislation.
| Principais autores: | , , |
|---|---|
| Formato: | Digital revista |
| Idioma: | English |
| Publicado em: |
Sociedade Brasileira de Química
2016
|
| Acesso em linha: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532016000701273 |
| Tags: |
Adicionar Tag
Sem tags, seja o primeiro a adicionar uma tag!
|