Copper and Iron Determination with [<Emphasis Type="Italic">N</Emphasis>,<Emphasis Type="Italic">N</Emphasis>′-Bis(salicylidene)-2,2′-dimethyl-1,3-propanediaminato] in Edible Oils Without Digestion |
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Authors: | Eda Köse Baran Sema Bağdat Yaşar |
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Affiliation: | 1.Institute of Science and Technology,Bal?kesir University,Bal?kesir,Turkey;2.Chemistry Department, Faculty of Science and Arts,Bal?kesir University,Bal?kesir,Turkey |
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Abstract: | A new method for the determination of copper(II) and iron(III) in liquid edible oils which does not require a digestion step
was developed. The suggested method involves extraction of metals with N,N′-bis(salicylidene)-2,2′-dimethyl-1,3-propanediaminato] (LDM) followed by flame atomic absorption spectrometry measurement.
As a first step, metal complexes of copper(II) and iron(III) ions with LDM were investigated spectrophotometrically. After
the analytical properties and experimental conditions of the complexation had been determined, these findings were used to
determine the extraction period as a second step. Experimental conditions were optimized using a central composite design.
Optimum conditions for Cu(II) and Fe(III) extractions from oil were found: the ratios of the volume of Schiff base solution
used to the mass of oil (V
LDM/m
oil; mL g−1) were 0.76 and 1.19 mL g−1, the stirring times were 73 and 67 min, and the temperatures were 31 and 28 °C, respectively. The developed extraction and
determination method was tested on certified reference materials; the recovery percentages were found to be 99.4 ± 2.8 and
100.2 ± 5.6 for Cu(II) and Fe(III), respectively. The suggested method was performed on real samples such as olive oil, sunflower
oil, corn oil, canola oil and recovery values between 97.2–102.1 for Cu(II) and 94.5–98.6 for Fe(III) were determined. It
was concluded that the developed method has some advantages over the common traditional method including rapidity, sensitivity,
accuracy, reduced risk and cost. |
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Keywords: | |
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