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      Strategy of Sample Preparation for Arsenic Determination in Mineral Fertilizers

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          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.

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          Toxicol. Sci.

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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Journal
                jbchs
                Journal of the Brazilian Chemical Society
                J. Braz. Chem. Soc.
                Sociedade Brasileira de Química
                1678-4790
                June 2016
                : 27
                : 7
                : 1273-1278
                Affiliations
                [1 ] Universidade Federal de São Carlos Brazil
                [2 ] Embrapa Pecuária Sudeste Brazil
                Article
                S0103-50532016000701273
                10.5935/0103-5053.20160024
                ac806dcd-210d-45cd-9f30-7799fe784001

                This work is licensed under a Creative Commons Attribution 4.0 International License.

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                SciELO Brazil

                Self URI (journal page): http://www.scielo.br/scielo.php?script=sci_serial&pid=0103-5053&lng=en
                Categories
                CHEMISTRY, MULTIDISCIPLINARY

                General chemistry
                sample preparation,mineral fertilizers,arsenic,factorial design,CF-HG-AAS
                General chemistry
                sample preparation, mineral fertilizers, arsenic, factorial design, CF-HG-AAS

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