پديدآورندگان :
Sobhi Hamid Reza Department of Chemistry, Payame Noor University, Tehran, Iran , Mohammadzadeh Alireza Department of Chemistry, Payame Noor University, Tehran, Iran , Esrafili Ali Department of Environmental Health Engineering, School of Public Health, Iran University of Medical Sciences, Tehran, Iran , Behbahani Mohammad Faculty of Engineering, Shohadaye Hoveizeh University of Technology, Dasht-e Azadegan, Susangerd, Iran , Ghambarian Mahnaz ghambarian.m@gmail.com Iranian Research and Development Center for Chemical Industries, ACECR, Tehran, Iran, , Esrafili Leili Department of Chemistry, Tarbiat Modares University, Tehran, Iran
كليدواژه :
Microextraction , Dispersive solid phase , Lead , Ultrasonic waves , Aqueous and urine samples
چكيده فارسي :
Lead is defined as heavy metals which is generally considered to be widely distributed and abundant in environmental water samples as well as being biologically significant as a toxic substance [1,2]. Herein, an amino-tagged silica-based nano sorbent (MCM-41-NH2) was applied as a complexing agent for the effective ultrasonic assisted µ-dispersive solid phase extraction of Pb from various water samples [3]. The sorbent was successfully synthesized and subsequently characterized by scanning electron microscopy, X-ray diffraction and Fourier-transform infrared spectrometry. The analyte was extracted by the nanosorbent through complex formation. Once the extraction of analyte was completed, the target ion was desorbed from the sorbent and detected by AAS. Various factors affecting the extraction and desorption of the analytes were investigated in detail and the optimum conditions established. Under the optimum conditions, the calibration curves were linear over the concentration range of 1-25 ng/mL, and based on a signal-to-noise ratio of 3 (S/N = 3), the limits of detection were determined to be 0.5 ng/mL for the analyte. To test the extraction efficiency, the method was applied to various real fortified water and urine samples. The average relative recoveries obtained from the fortified real samples varied in the range of 90-112% with relative standard deviations of 4.9-8.8%.
