Mashkani Masoumeh, Mehdinia Ali, Jabbari Ali, Bide Yasamin, Nabid Mohammad Reza
Department of Chemistry, Faculty of Science, K. N. Toosi University of Technology, Tehran, Iran.
Department of Marine Living Science, Ocean Science Research Center, Iranian National Institute for Oceanography and Atmospheric Science, Tehran, Iran.
Food Chem. 2018 Jan 15;239:1019-1026. doi: 10.1016/j.foodchem.2017.07.042. Epub 2017 Jul 12.
Magnetically N-doped Carbon quantum dots has been synthesized via a simple chemical method and applied as a sorbent for the preconcentration and extraction of trace amounts of Pb from water and vegetable samples followed by flame atomic absorption spectrometric detection. The nanoparticles were characterized by X-ray diffraction, UV-vis spectra, Fourier transform infrared spectroscopy, vibrating sample magnetometer analysis and transmission electron microscopy. A central-composite design was used to find the optimum conditions for the preconcentration procedure through response surface methodology. The effects of various parameters such as the pH value, adsorption time, amount of adsorbent, desorption conditions (type, concentration and volume of the eluent and desorption time), sample volume and interfering ions have been studied. Under the optimized conditions, the calibration graph was linear in the range of 0.3-300μgL (R=9992). The detection limit and pre-concentration factor were found to be 0.082μgL and 265, respectively.
通过一种简单的化学方法合成了磁性氮掺杂碳量子点，并将其用作吸附剂，用于对水和蔬菜样品中的痕量铅进行预富集和萃取，随后采用火焰原子吸收光谱法进行检测。通过X射线衍射、紫外可见光谱、傅里叶变换红外光谱、振动样品磁强计分析和透射电子显微镜对纳米颗粒进行了表征。采用中心复合设计，通过响应面法寻找预富集过程的最佳条件。研究了各种参数的影响，如pH值、吸附时间、吸附剂用量、解吸条件（洗脱剂的类型、浓度和体积以及解吸时间）、样品体积和干扰离子。在优化条件下，校准曲线在0.3-300μg/L范围内呈线性（R=0.9992）。检测限和预富集因子分别为0.082μg/L和265。
