亚砷酸盐
检出限
电凝
流出物
微分脉冲伏安法
化学
废水
砷
色谱法
核化学
材料科学
电化学
循环伏安法
电极
环境工程
冶金
环境科学
物理化学
作者
Samuel Piña,Miguel A. Sandoval,Paola Jara‐Ulloa,David Contreras,Natalia Hassan,Oscar Coreño,Ricardo Salazar
出处
期刊:Chemosphere
[Elsevier]
日期:2022-11-01
卷期号:306: 135530-135530
被引量:3
标识
DOI:10.1016/j.chemosphere.2022.135530
摘要
A sensitive electroanalytical method for the determination of arsenite, based on a heterostructure of aminated multiwalled carbon nanotubes and gold nanoparticles, was applied in an electrocoagulation (EC) treatment for the elimination of arsenite. A sensitive quantitative response was obtained in the determination of As3+ in a secondary effluent from a wastewater treatment plant from Santiago (Chile). The preconcentration stage was optimized through a Central Composite Face design, and the most sensitive peak current was obtained at 200 s and −600 mV of time and accumulation potential, respectively, after a differential pulse voltammetry sweep. Electroanalytical determination was possible in an interval between 42.89 and 170.00 μg L−1 with a detection limit of 0.39 μg L−1, obtaining recoveries over 99.1%. The developed method was successfully applied in an electrocoagulation treatment to remove 250 μg L−1 of arsenite from a polluted effluent in a batch system. Complete arsenite removal was achieved using a steel EC system with a current density of 6.0 mA cm−2 in less than 3 min of treatment.
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