Methods to Quantify Nickel in Soils and Plant Tissues

Autor: Bruna Wurr Rodak, Milton Ferreira de Moraes, João Augusto Lopes Pascoalino, Adilson de Oliveira Junior, Cesar de Castro, Volnei Pauletti
Jazyk: angličtina
Rok vydání: 2015
Předmět:
Zdroj: Revista Brasileira de Ciência do Solo, Vol 39, Iss 3, Pp 788-793 (2015)
Druh dokumentu: article
ISSN: 1806-9657
01000683
DOI: 10.1590/01000683rbcs20140542
Popis: In comparison with other micronutrients, the levels of nickel (Ni) available in soils and plant tissues are very low, making quantification very difficult. The objective of this paper is to present optimized determination methods of Ni availability in soils by extractants and total content in plant tissues for routine commercial laboratory analyses. Samples of natural and agricultural soils were processed and analyzed by Mehlich-1 extraction and by DTPA. To quantify Ni in the plant tissues, samples were digested with nitric acid in a closed system in a microwave oven. The measurement was performed by inductively coupled plasma/optical emission spectrometry (ICP-OES). There was a positive and significant correlation between the levels of available Ni in the soils subjected to Mehlich-1 and DTPA extraction, while for plant tissue samples the Ni levels recovered were high and similar to the reference materials. The availability of Ni in some of the natural soil and plant tissue samples were lower than the limits of quantification. Concentrations of this micronutrient were higher in the soil samples in which Ni had been applied. Nickel concentration differed in the plant parts analyzed, with highest levels in the grains of soybean. The grain, in comparison with the shoot and leaf concentrations, were better correlated with the soil available levels for both extractants. The methods described in this article were efficient in quantifying Ni and can be used for routine laboratory analysis of soils and plant tissues.
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