Determination of ni and zn in an oil matrix using schiff base-assisted extraction followed by a flame atomic absorption spectrometer: a simple strategy to determine ni and zn

Abstract

In the present work, a new and simple Schiff base-assisted extraction strategy for Ni and Zn from an edible oil matrix with subsequent determination using a flame atomic absorption spectrometer was suggested. According to the green approach, laborious sample-pretreatment procedures were eliminated via complexation of the analytes with N,N-bis(4-methoxysalycylidene)-2-hydroxy-1,3-propanediamine (4MSHP) and transferred from the oil phase to the aqueous phase. The complexation properties of 4MSHP, Ni, and Zn were investigated using UV-vis spectrophotometry. The experimental conditions that affect the extraction efficiency were optimized using central composite design. The optimum conditions for the extraction of Ni and Zn were as follows: a volume to oil mass ratio of 0.83 to 1.31 mL g(-1) of 4MSHP solution; 62.3- and 50.6-min, stirring time; 27.3 and 31.1 degrees C, temperature, respectively. The detection limits (3s(b)m(-1)) were 0.41 g g(-1) for Ni and 0.16 g g(-1) for Zn. Validation of the suggested work was performed by the analysis of organometallic standard-doped n-hexane solutions as certified reference materials under the optimum experimental conditions. The recovery percentages were warranted the accuracy and found as 98.2 +/- 1.8% for Ni and 99.8 +/- 1.2% for Zn. In addition, relative SD values were below 5% for both the analytes. The Student's t-test showed that there was no significant difference between the found and doped amount of analytes at 95% confidence level. The features such as the detection technique, cheapness, eco-friendly solvent usage, and practicality were better compared to the literature.