Article

Comparison of USEPA digestion methods to heavy metals in soil samples

Departamento de Agronomia, UFRPE, Endereço: Rua Dom Manuel de Medeiros, S/N, Dois Irmãos, Brazil, .
Environmental Monitoring and Assessment (Impact Factor: 1.68). 07/2013; 186(1). DOI: 10.1007/s10661-013-3354-5
Source: PubMed

ABSTRACT The use of appropriate analytical methods is of paramount importance for risk assessment and monitoring of potentially toxic metals in soils. In this sense, the objective of this study was to compare the effectiveness of two sample digestion methods, recommended by the Brazilian legislation for the management of contaminated areas (CONAMA 2009), aiming at the determination of environmentally available metal concentrations (USEPA 3050B, USEPA 3051A), as well as a total digestion method (USEPA 3052). Samples from 10 classes of soils were analyzed for Cu, Zn, Cd, Pb, Ni, and Hg. The results showed that the USEPA method 3051A is more efficient than the USEPA method 3050B in the extraction of levels considered environmentally available of Zn, Cu, Cd, Pb, and Ni. Besides providing a higher recovery of these elements, the method requires shorter digestion time, lower consumption of acids, and reduced risk of contamination. The USEPA method 3051A showed greater efficiency in Hg extraction in soils with higher clay content. Therefore, it is suitable for situations where a wide range of soils with different mineralogical characteristics are analyzed or in order to decrease the losses due to volatilization of the element in open systems.

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    • "The procedure for soil and sediment digestion is mainly carried out by alkaline fusion (Uchida et al. 2005), acid digestion using mineral acid and heating with a hot plate (Kelepertzis 2014), or applying a microwave-assisted digestion (Marin et al. 2008; Roje 2011; Melaku et al. 2005). The US Environmental Protection Agency (EPA) has published the methods EPA 3050, 3051, 3051a, and 3052 for acid digestion of soil, sediments, and sludge samples for analysis by AAS, ICP OES, and ICP-MS techniques (Silva et al. 2014). Most of the US EPA methods are not able to promote total sample decomposition, only the microwave-assisted US EPA 3052 in presence of hydrofluoric acid (HF) allows a total sample digestion. "
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    ABSTRACT: The concentration of metals in Brazilian soil under no-tillage (NT) and an area under native vegetation (NV) was determined by inductively coupled plasma mass spectrometry. The applied method was based on microwave-assisted acid digestion using HNO3, HCl, H2O2, and HF. The accuracy of the method was evaluated by analyzing two certified reference materials (BCR-142 and RS-3). The relative standard deviation for all target elements was below 8 % indicating an adequate precision and the limit of detection ranged from 0.03 μg g(-1) (Cd) to 24.0 μg g(-1) (Fe). The concentrations of Al, As, Ba, Cd, Cu, Fe, Mg, Mn, Ni, Pb, Sr, and Zn in the different layers (0-10, 10-20, 20-40, and 40-60 cm) were determined in two types of soils, located in Paraná State in Brazil. The soil layers analysis revealed a different behavior of metals concentrations in soil samples under NT and NV. The obtained results showed a clear impact of anthropogenic action with respect to specific metals due to many years of uncontrolled application rates of limestone and phosphate fertilizers.
    Environmental Monitoring and Assessment 08/2015; 187(8):4769. DOI:10.1007/s10661-015-4769-y · 1.68 Impact Factor
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    • "The procedure for soil and sediment digestion is mainly carried out by alkaline fusion (Uchida et al. 2005), acid digestion using mineral acid and heating with a hot plate (Kelepertzis 2014), or applying a microwave-assisted digestion (Marin et al. 2008; Roje 2011; Melaku et al. 2005). The US Environmental Protection Agency (EPA) has published the methods EPA 3050, 3051, 3051a, and 3052 for acid digestion of soil, sediments, and sludge samples for analysis by AAS, ICP OES, and ICP-MS techniques (Silva et al. 2014). Most of the US EPA methods are not able to promote total sample decomposition, only the microwave-assisted US EPA 3052 in presence of hydrofluoric acid (HF) allows a total sample digestion. "
    Química Nova 01/2015; DOI:10.5935/0100-4042.20150021 · 0.66 Impact Factor