Strategy of Sample Preparation for Arsenic Determination in Mineral Fertilizers

被引：9
作者：
Machado, Raquel C. [1 ,2 ]
Pereira-Filho, Edenir R. [1 ]
Nogueira, Ana Rita A. [1 ,2 ]
机构：
[1] Univ Fed Sao Carlos, Dept Quim, Grp Anal Instrumental Aplicada, BR-13565905 Sao Carlos, SP, Brazil
[2] Embrapa Pecuaria Sudeste, BR-13560970 Sao Carlos, SP, Brazil
来源：
JOURNAL OF THE BRAZILIAN CHEMICAL SOCIETY | 2016年 / 27卷 / 07期
基金：
巴西圣保罗研究基金会;
关键词：
sample preparation; mineral fertilizers; arsenic; factorial design; CF-HG-AAS; ATOMIC-ABSORPTION-SPECTROMETRY; OPTICAL-EMISSION-SPECTROMETRY; TRACE-ELEMENTS; PHOSPHATE FERTILIZERS; GENERATION; INTERFERENCES; CONTAMINATION; CADMIUM; LEAD; SOIL;
D O I：
10.5935/0103-5053.20160024
中图分类号：
O6 [化学];
学科分类号：
0703 ;
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.
引用
收藏
页码：1273 / 1278
页数：6
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