Analytical Procedure for Determining of Lead in Isopropyl Palmitate (IPP) by Atomic Absorption Spectrometry

Abstract

Isopropyl palmitate is a non-polar ester and does not directly dissolve in aqueous diluents. The sample is therefore digested using acidic hotplate mineralization, converting all Pb into an aqueous ionic form. In this present study, we measured the concentration of lead in isopropyl palmitate by using flame AAS for higher sensitivity. The resulting digest is analyzed at 283.3 nm. Spectrophotometric determination of lead in isopropyl palmitate sample was found to be adequately sensitive in terms of linearity, repeatability, and accuracy. The correlation coefficient (R²) was found to be 0.9998, average sample result has been found 0.02 mg/Kg. The results were within the specification of not more than 10 mg/Kg maximum.