A simple methodology for the measurement of trace and ultratrace metals in edible oils is described.
The document presents a simple methodology for the direct measurement of trace and ultratrace metals in various seed, olive, and nut oils. The procedure involves a simple 3x dilution of the oil sample in kerosene followed by analysis using an Agilent 7500cx ICP-MS equipped with Octopole Reaction System (ORS) technology.
The ORS is utilized to remove plasma- and matrix-based interferences within a single acquisition, significantly improving detection limits for elements such as Chromium, Iron, and Magnesium. The study reports detection limits ranging from micrograms per kilogram (ppb) to nanograms per kilogram (ppt) and demonstrates the system's stability with approximately 2% RSD precision over an 8-hour run.