پديدآورندگان :
Sobhi Hamid Reza - Payame Noor University, Tehran, Iran , Ghambarian Mahnaz ghambarian.m@gmail.com Iranian Research and Development Center for Chemical Industries, ACECR, Tehran, Iran; , Behbahani Mohammad - Department of Mechanical Engineering, Shohadaye Hoveizeh University of Technology, Susangerd, Iran , Esrafili Ali - Department of Environmental Health Engineering, School of Public Health, Iran University of Medical Sciences, Tehran, Iran , Esrafili Leili - Department of Chemistry, Tarbiat Modares University, Tehran, Iran
چكيده فارسي :
Herein, an amino-based silica-coated nanomagnetic sorbent (Fe3O4@SiO2-NH2) was applied for the effective extraction of two chlorophenoxyacetic acids (MCPA and 2,4-D) from various water samples through the ionic interactions [1,2]. The sorbent was successfully synthesized and subsequently characterized by scanning electron microscopy, X-ray diffraction and Fourier-transform infrared spectrometry. The analytes were extracted by the sorbent mainly through ionic interactions. Once the extraction of analytes was completed, they were desorbed from the sorbent and detected by high performance liquid chromatography with ultra violet detection (HPLC-UV). 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 1-250, and based on a signal-to-noise ratio of 3 (S/N = 3), the limits of detection were determined to be 0.5 µg/L for both analytes. To test the extraction efficiency, the method was applied to various fortified real water samples. The average relative recoveries obtained from the fortified water samples varied in the range of 91-108% with relative standard deviations of 2.9 - 7.8%. Finally, the method was determined to be robust and effective for environmental water analysis.
