فهرست نشریات علمی دسترسی آزاد ایران

In this study, a new and effective sorbent based on melamine-functionalized magnetic ZIF-67 (Fe3O4@ZIF-67@Melamine) was developed for the separation, preconcentration and determination of nitroaromatic and nitramine compounds. The composite was synthesized through a simple and efficient procedure in which the main ZIF-67 crystallization and melamine functionalization steps were conducted under mild conditions (≤80 °C) without the need for high-temperature solvothermal methods, making the process energy-efficient and environmentally friendly. The morphology and structure of the adsorbent were characterized by SEM, XRD, FTIR, BET, and VSM techniques. Thus, this sorbent was successfully applied in magnetic solid-phase extraction coupled with high-performance liquid chromatography and ultraviolet detection for the simultaneous and effective isolation and determination of nitroaromatic and nitramine compounds in real samples. The predominant experimental factors affecting the extraction, including the amount of adsorbent, effect of contact time between the sample and adsorbent, type and volume of eluent, volume of sample solution, desorption time, and reusability were investigated and optimized. Under optimized conditions, the linear range was in range of 0.5-200 µg L-1 for TNT, 2,4-DNT, 2,6-DNT and 1-200 µg L-1 for HMX , RDX. The proposed method was successfully applied to the analysis of nitroaromatic and nitramine compounds in water and soil samples with satisfactory relative recoveries (96–104.8%) and relative standard deviations of less than7.0%.