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

Journal of the Brazilian Chemical Society

Liu, Hong¹  Feng, Shouai² 

[1] Kunming University of Science and Technology, Kunming, China;Technology Centre of China Tobacco Guangxi Industrial Co, Nanning, China

关键词: magnetic solid phase extraction;    lead;    copper;    tobacco samples;    flame atomic absorption spectrometry.;   

DOI  :  10.21577/0103-5053.20170120

学科分类：化学（综合）

来源: SciELO

【 摘 要 】

A new method using nonanoic acid-coated magnetic Fe3O4 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%.

【 授权许可】

CC BY