Acuña-Nicolás Jessica, Montesinos-Vázquez Tanese, Pérez-Silva Irma, Galán-Vidal Carlos A, Ibarra Israel S, Páez-Hernández M Elena
Laboratorio 2, Área Académica de Química, Universidad Autónoma del Estado de Hidalgo, Carretera Pachuca-Tulancingo Km. 4.5, Mineral de la Reforma 42184, Mexico.
Polymers (Basel). 2023 Jul 18;15(14):3086. doi: 10.3390/polym15143086.
Since lead is a highly toxic metal, it is necessary to detect its presence in different samples; unfortunately, analysis can be complicated if the samples contain concentrations below the detection limit of conventional analytical techniques. Solid phase extraction is a technique that allows the carrying out of a pre-concentration process and thus makes it easy to quantify analytes. This work studied the efficiency of sorption and preconcentration of lead utilizing polysulfone (PSf) fibers grafted with acrylic acid (AA). The best conditions for Pb(II) extraction were: pH 5, 0.1 mol L of ionic strength, and 40 mg of sorbent (70% of removal). The sorbed Pb(II) was pre-concentrated by using an HNO solution and quantified using flame atomic absorption spectrometry. The described procedure was used to obtain a correlation curve between initial concentrations and those obtained after the preconcentration process. This curve and the developed methodology were applied to the determination of Pb(II) concentration in a water sample contained in a handmade glazed clay vessel. With the implementation of the developed method, it was possible to pre-concentrate and determine a leached Pb(II) concentration of 258 µg L.
由于铅是一种剧毒金属，有必要检测其在不同样品中的存在；不幸的是，如果样品中铅的浓度低于传统分析技术的检测限，分析可能会变得复杂。固相萃取是一种能够进行预浓缩过程的技术，因此便于对分析物进行定量。这项工作研究了用接枝丙烯酸（AA）的聚砜（PSf）纤维对铅的吸附和预浓缩效率。萃取Pb（II）的最佳条件为：pH值5、离子强度0.1 mol/L以及40 mg吸附剂（去除率70%）。吸附的Pb（II）用HNO溶液进行预浓缩，并使用火焰原子吸收光谱法进行定量。所描述的程序用于获得初始浓度与预浓缩过程后所得浓度之间的相关曲线。该曲线和所开发的方法应用于测定手工制作的釉面粘土容器中水样的Pb（II）浓度。通过实施所开发的方法，可以预浓缩并测定浸出的Pb（II）浓度为258 µg/L。
