adsorption of glyphosate on clays and soils from paraná state: effect of ph and competitive adsorption of phosphate

草甘膦在巴拉那州黏土和土壤上的吸附：pH值及磷酸盐竞争吸附的影响

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ID: 211842
2007
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Abstract
This work showed that the adsorption of glyphosate (GPS) depends on surface area for clays and amount of clays and CEC for soils. Organic matter (OM) had a secondary role in the adsorption of GPS on soils. The adsorption of GPS on soils from Londrina and Floraí counties and clays (montmorillonite, kaolinite) decreased when pH increased, however, for bentonite clay and soil from Tibagi county was kept constant. For the soils, the competitive adsorption between GPS and phosphate showed that displace of GPS by phosphate was related to the amount of clays, CEC and pH. GPS was not easily displaced by phosphate on the clays. The FT-IR spectra of the soils and clays showed that soil from Londrina resembled kaolinite. Thus, this could explain the results of adsorption of GPS and the competitive adsorption between GPS and phosphate.
No presente trabalho foi mostrado que a adsorção de glifosato (GPS) depende da área superficial (argilas) e da quantidade de argilas e da CTC (solos). A matéria orgânica (MO) tem um papel secundário na adsorção do GPS sobre solos. A adsorção de GPS sobre os solos de Londrina e Florai e argilas (montimorilonita, caulinita) diminui com o aumento do pH e manteve-se constante para a bentonita e o solo de Tibagi. Para os solos estudados, a adsorção competitiva entre GPS e fosfato mostrou que o deslocamento do GPS pelo fosfato depende da quantidade de argilas, CTC e pH. O GPS não foi facilmente desorvido das argilas pelo fosfato. Os espectros IV-FT dos solos e argilas mostraram que o solo de Londrina e a caulinita são muito semelhantes. Portanto, isto poderia explicar os resultados de adsorção do GPS e da adsorção competitiva entre o GPS e o fosfato apresentarem resultados semelhantes.
本研究表明，草甘膦（GPS）的吸附在黏土中取决于比表面积，而在土壤中则取决于黏土含量和阳离子交换量（CEC）。有机质（OM）在土壤吸附GPS的过程中起次要作用。来自隆德里纳（Londrina）和弗洛拉伊（Floraí）地区的土壤以及黏土（蒙脱石、高岭石）对GPS的吸附量随pH值的升高而降低；然而，膨润土和来自蒂巴吉（Tibagi）地区的土壤吸附量则保持恒定。对于土壤体系，GPS与磷酸盐之间的竞争吸附表明，磷酸盐对GPS的置换与黏土含量、CEC和pH值相关。黏土上的GPS不易被磷酸盐置换。土壤和黏土的FT-IR光谱显示，隆德里纳土壤与高岭石相似。因此，这可以解释GPS的吸附以及GPS与磷酸盐竞争吸附的研究结果。
在本研究中表明，草甘膦（GPS）的吸附取决于比表面积（黏土体系）以及黏土含量和阳离子交换容量（CTC，土壤体系）。有机质（MO）在土壤吸附GPS中起次要作用。隆德里纳和弗洛拉伊土壤以及黏土（蒙脱石、高岭石）对GPS的吸附随pH值的升高而降低，而在膨润土和蒂巴吉土壤中则保持恒定。对于所研究的土壤，GPS与磷酸盐之间的竞争吸附表明，磷酸盐对GPS的置换取决于黏土含量、CTC和pH值。黏土中的GPS不易被磷酸盐解吸。土壤和黏土的IV-FT光谱表明，隆德里纳土壤与高岭石高度相似。因此，这可以解释GPS的吸附结果与GPS和磷酸盐之间的竞争吸附呈现相似结果的原因。
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cruz2007brazilianadsorption Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Lútecia Hiera da Cruz, Henrique de Santana, Cássia Thaïs Bussamra Vieira Zaia, Dimas Augusto Morozin Zaia
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Journal current drug delivery
Year 2007
DOI
10.1590/S1516-89132007000300004
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132007000300004
Keywords
adsorption glyphosate clays soilsbiotechnology

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