Determination of Cu2+ Zn2+ and Pb2+ in biological and food samples by FAAS after preconcentration with hydroxyapatite nanorods originated from eggshell

作者：Mortada Wael I^*; Kenawy Ibrahim M M; Abdelghany Amr M; Ismal Amani M; Donia Ahmed F; Nabieh Kareem A

来源：Materials Science & Engineering C-Materials for Biological Applications, 2015, 52: 288-296.

DOI：10.1016/j.msec.2015.03.061

• Hydroxyapatite nanorods
• Solid phase extraction
• Trace metals
• Flame atomic absorption spectrometry

Hydroxyapatite nanorods (HAPNRs) were prepared from recycled eggshell by using precipitation method. The structure of the HAPNRs was physicochemically and morphologically characterized by X-ray diffraction, transmission electron microscopy and Fourier transform infrared spectroscopy. The resulting HAPNRs were used for solid phase extractive preconcentration of Cu2+, Zn2+ and Pb2+ prior to its determination by flame atomic absorption spectrometry. Experimental variables that influence the quantitative extraction of metal ions were optimized by both batch and column methods. The analytes were quantitatively sorbed on the matrix between pHs 6 and 9. The maximum sorption capacity of the HAPNRs has been found to be 2.43, 2.37 and 2.53 mmol g(-1), for Cu2+, Zn2+ and Pb2+, respectively, with the preconcentration factor of 250. The 3 sigma detection limit and 10 sigma quantification limit for Cu2+, Zn2+ and Pb2+ were found to be 0.72, 0.55 and 5.12 mu g L-1 and 2.40, 1.83 and 17.06 mu g L-1, respectively. The calibration curves were linear up to 250 mu g L-1 for Cu2+, 300 mu g L-1 for Zn2+ and 400 mu g L-1 for Pb2+. Accuracy of the proposed method was verified using certified reference materials (NCS ZC85006 Tomato, Seronorm Trace Elements Whole Blood L-1, Seronorm Trace Elements Whole Blood L-3 and Seronorm Trace Elements Urine). The present method was successfully applied to the analysis of these metal ions in sea water, biological and food samples.

• 出版日期2015-7-1