Strategy of Sample Preparation for Arsenic Determination in Mineral Fertilizers

Journal of the Brazilian Chemical Society

Machado, Raquel C.¹  Pereira-Filho, Edenir R.¹  Universidade Federal de São Carlos, São Carlos, Brazil¹  Nogueira, Ana Rita A.¹  Embrapa Pecuária Sudeste, São Carlos, Brazil¹ 

关键词:  sample preparation;    mineral fertilizers;    arsenic;    factorial design;    CF-HG-AAS;   

DOI  :  10.5935/0103-5053.20160024

学科分类：化学（综合）

来源: SciELO

【 摘 要 】

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.

【 授权许可】

Unknown