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Caracterização potenciométrica de substâncias húmicas extraídas de solos da Antártica Marítima

2013; Brazilian Chemical Society; Volume: 36; Issue: 9 Linguagem: Inglês

10.1590/s0100-40422013000900010

1678-7064

Juliana Vanir de Souza Carvalho, Eduardo de Sá Mendonça, Newton La Scala, César Reis, Efrain Lázaro Reis, Carlos Ernesto Gonçalves Reynaud Schaefer,

Soil Carbon and Nitrogen Dynamics

Monitoring of soil carbon storage may indicate possible effects of climate change on the terrestrial environment and it is therefore necessary to understand the influence of redox potential and chemical characteristics of humic substances (HS) of Antarctic soil.Five soils from King George Island were used.HS were extracted, quantified and characterized by potentiometry and the content of total carbon and nitrogen determined.HS of these soils had greater aliphatic character, low content of phenolic groups, lower acidity and lower formal standard electrode potential, compared to HS of soils from other regions, suggesting they are more likely to be oxidized.