Data/hora: 11/06/2024 04:04:04

Provedor de dados: | 90
País: | Brazil
Título: | Comparison of digestion methods to determine heavy metals in fertilizers
Autores: | Silva,Ygor Jacques Agra Bezerra da; Nascimento,Clístenes Williams Araújo do; Biondi,Caroline Miranda; Preston,Welka.
Data: | 2014-04-01
Ano: | 2014
Palavras-chave: | Soil contamination; Soil pollution; Chemical extraction.
Resumo: | The lack of a standard method to regulate heavy metal determination in Brazilian fertilizers and the subsequent use of several digestion methods have produced variations in the results, hampering interpretation. Thus, the aim of this study was to compare the effectiveness of three digestion methods for determination of metals such as Cd, Ni, Pb, and Cr in fertilizers. Samples of 45 fertilizers marketed in northeastern Brazil were used. A fertilizer sample with heavy metal contents certified by the US National Institute of Standards and Technology (NIST) was used as control. The following fertilizers were tested: rock phosphate; organo-mineral fertilizer with rock phosphate; single superphosphate; triple superphosphate; mixed N-P-K fertilizer; and fertilizer with micronutrients. The substances were digested according to the method recommended by the Ministry for Agriculture, Livestock and Supply of Brazil (MAPA) and by the two methods 3051A and 3052 of the United States Environmental Protection Agency (USEPA). By the USEPA method 3052, higher portions of the less soluble metals such as Ni and Pb were recovered, indicating that the conventional digestion methods for fertilizers underestimate the total amount of these elements. The results of the USEPA method 3051A were very similar to those of the method currently used in Brazil (Brasil, 2006). The latter is preferable, in view of the lower cost requirement for acids, a shorter digestion period and greater reproducibility.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832014000200029
Editor: | Sociedade Brasileira de Ciência do Solo
Relação: | 10.1590/S0100-06832014000200029
Formato: | text/html
Fonte: | Revista Brasileira de Ciência do Solo  v.38 n.2 2014
Fonte: | info:eu-repo/semantics/openAccess