Selective extraction and preconcentration of trace lead(II) in medicinal plant-based ionic liquid hollow fiber liquid phase microextraction system using dicyclohexyl-18-crown-6 as membrane carrier

Analytical methods

Lei Wang¹  Liang Ni¹  Yingying Liu¹  Juan Han²  Tong Chen³ 

[1] School of Chemistry and Chemical Engineering, Jiangsu University,Zhenjiang 212013,China;School of Food and Biological Engineering, Jiangsu University,Zhenjiang 212013,China;Zhenjiang Entry-Exit Inspection Quarantine Bureau, State Key Laboratory of Food Additive and Condiment Testing,Zhenjiang 212013,China

DOI  :  10.1039/C4AY02625J

学科分类：分析化学

来源: Royal Society of Chemistry

【 摘 要 】

A novel three-phase ionic liquid hollow fiber liquid phase microextraction (IL-HF-LPME) system was used for the selective extraction and preconcentration of Pb(II) from medicinal plants. Green solvent ionic liquid 1-hexyl-3-methylimidazolium hexafluorophosphate ([HMIM]PF6) containing dicyclohexyl-18-crown-6 (DCH18C6) was used as membrane phase immobilized in the hollow fiber pores. Ethylene diamine tetraacetic acid was used as stripping agent that can form water-soluble complex with Pb(II) in the lumen of the hollow fiber. After extraction, the acceptor solution was directly injected into a graphite furnace atomic absorption spectrometer for analysis. A Box–Behnken design was used to study the influence of DCH18C6 concentration, extraction time and pH on the extraction efficiency. Under the optimized conditions, an enrichment factor of 199 and a limit of detection of 0.008 ng mL−1 were obtained. The calibration curve was linear in the range of 0.05–0.5 ng mL−1 (R = 0.999). Moreover, the obtained results show that DCH18C6 can selectively and efficiently transport Pb(II) from the aqueous phase containing different concentrations of heavy metal ions (Cd2+, Co2+, Cu2+, Ni2+, Fe2+, Zn2+). The proposed method was successfully applied to determination of Pb(II) in medicinal plants with satisfactory recoveries in the range of 94–102%...

【 授权许可】

CC BY-NC