Federal University of Alagoas, CP 61, 57309-005 Arapiraca, AL, Brazil.
J Hazard Mater. 2010 May 15;177(1-3):307-11. doi: 10.1016/j.jhazmat.2009.12.033. Epub 2009 Dec 29.
Improved agricultural productivity, and reduction of environmental impacts, require studies of the interactions between different soil components. Fertilizers marketed as "organic" or "natural", such as peats or humic substances (HS) extracted from peats, are enriched with macro and micronutrients that, according to the manufacturers, are released to the plant in accordance with its needs. This work investigates the complexation capacity of HS for macro and micronutrient metal species, considering the competition, for HS complexation sites, between non-essential metals (aluminium and lead), present in the soil, and the nutrients. Humic substances were found to possess strong affinities for Pb(II) and Al(III), forming stable complexes, with concomitant release of complexed nutrients. Although HS are already used commercially as organic fertilizers, further studies of methods of HS enrichment, aimed at avoiding losses, are highly desirable from environmental and economic perspectives.
提高农业生产力和减少环境影响需要研究不同土壤成分之间的相互作用。市场上销售的“有机”或“天然”肥料，如泥炭或从泥炭中提取的腐殖质（HS），富含宏量和微量元素，据制造商称，这些元素会根据植物的需要释放到植物中。这项工作研究了 HS 对宏量和微量元素金属物种的络合能力，考虑了土壤中非必需金属（铝和铅）与营养素之间对 HS 络合位点的竞争。腐殖质对 Pb(II) 和 Al(III) 具有很强的亲和力，形成稳定的配合物，同时释放出配合的营养素。虽然 HS 已经被商业上用作有机肥料，但从环境和经济的角度来看，进一步研究 HS 富集的方法以避免损失是非常可取的。
