Influence of the extractant on the complexing capacity of humic substances from peat for macro and micronutrients using continuous flow: agricultural application and environmental impacts

Journal of the Brazilian Chemical Society

Santos, Ademir¹  São Paulo State University, Araraquara, Brazil¹  Rocha, Julio C.¹  São Paulo State University, Sorocaba, Brazil¹  Botero, Wander G.¹  Oliveira, Luciana C.¹  Federal University of Alagoas, Arapiraca, Brazil¹  Cavagis, Alexandre D. M.¹  Federal University of São Carlos, Sorocaba, Brazil¹  Rosa, Andre H.¹ 

关键词: humic substances;    peat;    complexation capacity;    continuous flow extraction;   

DOI  :  10.5935/0103-5053.20130252

学科分类：化学（综合）

来源: SciELO

【 摘 要 】

The aim of the present work was to optimize a procedure for extraction of humic substances (HS) from peat, using continuous flow with different extractants (NaOH, KOH and Na4P2O7). The influence of extractant on the complexing capacity of humic substances for macro and micronutrients was also investigated. Our results showed that the extraction by flow is efficient, reducing the time required in the extraction step and, furthermore, indicating that the extracted HS have a high affinity for the essential nutrients Ca and Mg. Moreover, an enhanced complexation was achieved by using Na4P2O7, demonstrating not only the efficiency of this compound as extractant, but also its promising application in the process, since its high complexing capacity allows to make available the complexed nutrients as well as diminishing the amount of these nutrients that could be lixiviated, thus contributing to prevent environmental contaminations.

【 授权许可】

Unknown