Effects of extracellular polymeric substances of Pseudomonas fluorescens, citrate, and oxalate on Pb sorption by an acidic Ultisol.
作者： NJ] Nkoh Nkoh [Nkoh , Lu HaiLung Lu HaiLung , Pan XiaoYing Pan XiaoYing , Dong Ge Dong Ge , MA Kamran
DOI: 10.1016/J.ECOENV.2019.01.043
关键词: Isoelectric point 、 Organic acid 、 Nuclear chemistry 、 Surface charge 、 Chemistry 、 Adsorption 、 Zeta potential 、 Oxalate 、 Extracellular polymeric substance 、 Ionic strength
摘要: Abstract The continuous production of low molecular weight (LMW) organic acids by plants and microorganisms coupled with the presence extracellular polymeric substances (EPS) in soils is a guarantee that mobility heavy metals will be controlled. effects citrate, oxalate, EPS on adsorption Pb an acidic Ultisol were studied both as function pH ionic strength. Electrokinetic potential measurements also employed to observe what extent each ligand affected surface charge property Ultisol. All ligands shifted zeta negative direction, implying soil became more negative. effect was observed order oxalate ˃ citrate EPS. quantity adsorbed at (3.0–7.0) reflected corresponding change induced ligand. isoelectric point from 4.8 3.2 for system below 3.0 systems. More than two most outstanding mechanisms governed (1) electrostatic attraction which supported increase and, (2) complexation lesser proportion higher spectroscopic data combination + effective enhancing citrate.
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