Abstract
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.
Highlights
Mineral fertilizers are added to provide the soil the three basic plant nutrients: nitrogen, phosphorus and potassium
The full factorial design was used for evaluating the variables that would contribute to the best recoveries of arsenic obtained by CF-hydride generation atomic absorption spectrometry (HG-AAS)
Comparing the certified and determined arsenic values obtained by the two proposed digestion procedures, statistically similar results were obtained at 95% confidence level
Summary
Mineral fertilizers are added to provide the soil the three basic plant nutrients: nitrogen, phosphorus and potassium. A method for arsenic determination in mineral fertilizers by using continuous flow HG‐AAS (CF‐HG-AAS) was developed, combining sample decomposition procedure with diluted acid and digester block with PFA vessels.
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