Nonanoic Acid-Coated Magnetite Nanoparticles for Separation and Preconcentration of Lead and Copper in Tobacco Samples prior to Flame Atomic Absorption Spectrometry Determination

Abstract

A new method using nonanoic acid-coated magnetic Fe 3 O 4 nanoparticles as adsorbent has been developed for the single-step extraction and preconcentration of lead and copper in tobacco samples. Transmission electron microscopy and X-ray diffraction spectrometry were used to characterize the adsorbent. The experimental parameters affecting extraction efficiency, including amount of nanoparticles, volume of chelating reagents, sample pH, ultrasonic time and desorption conditions were investigated. The analytes desorbed from nanoparticles were determined by flame atomic absorption spectrometry. Under the optimum conditions, good linearity was obtained in the range of 2-400 μg L -1 for copper and 5-800 μg L -1 for lead (r > 0.998, p < 0.05). The limits of detection for copper and lead were 0.2 and 0.5 μg L -1 , with enrichment factors of 45 and 52, respectively. The method was successfully employed to tobacco sample analysis and got excellent recoveries between 89.2 and 100.7% with relative standard deviations (n = 6) of 4.5-5.9%.

Development of experimental device for inductive heating of magnetic nanoparticles

“…These relatively high values at 300 K indicate that the particles are in the blocked state. Therefore, equation ( 7) is applicable [42,43], and the effective magnetic anisotropy constant (K) was calculated to be 24.63 kJ m −3 at 2 K, 3K ef (7) where, χ Bl is the magnetic susceptibility of the random oriented particles in the blocked state and M S is the saturation magnetization.…”

“…Researchers have been extensively using MNP in electronic devices for recording and storage media, sensor [1][2][3], energy storage, microwave devices and electromagnetic interference shielding [4]. MNPs are also important in environmental applications, such as the removal of heavy metals [5][6][7] and oil [8]. Additionally, MNPs are explored for nanocatalysis [9] and petroleum science [10].…”