Separation and preconcentration of Cu(II), Pb(II), Zn(II), Fe(III) and Cr(III) ions with coprecipitation method without carrier element and their determination in food and water samples

Abstract

In this study, Cu(II), Pb(II), Zn(II), Fe(III) and Cr(III) were determined in some food and water samples after development 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP) coprecipitation procedure using flame atomic absorption spectrometry (FAAS). Effects of some analytical parameter including pH, sample volume, reagent amount, centrifuge rate and time, etc. on the presented coprecipitation system were studied for the quantitative recoveries of Cu(II), Pb(II), Zn(II), Fe(III) and Cr(III) ions. The influences of matrix ions were examined. The recovery values for analyte ions were calculated ⩾ 95%. The relative standard deviation was found 8.0% and the preconcentration factor was found as 25 for all analyte ions. The detection limits (k=3, N=21) were found to be as 0.80 μg L(-1) Cu(II), 3.08 μg L(-1) Pb(II), 0.28 μg L(-1) Zn(II), 0.91 μg L(-1) Fe(III) and 1.82 μg L(-1) Cr(III). NIST SRM 1515 Apple leaves and GBW-07605 Tea certified reference materials were used to confirm the accuracy of the method. The simultaneous coprecipitation method was applied to various water and microwave digested food samples.

Keywords: 2,9-Dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP); Coprecipitation; Flame atomic absorption spectrometry; Food samples; Trace element; Water.