This article introduces the method for determination of trace metals in palm oil samples using GTA-96 graphite tube atomizer.
The document describes a method for monitoring metal contamination in various types of palm oil (crude, refined, degummed, hydrogenated) caused by processing steps like bleaching and deodorization. The analysis utilizes Graphite Furnace Atomic Absorption Spectroscopy (GFAAS), which offers advantages such as requiring small sample quantities and providing greater sensitivity compared to flame methods.
The note outlines specific instrumentation used, including the Agilent SpectrAA-40 spectrophotometer with hollow cathode lamps and an Epson MX-80 printer. It details sample preparation techniques involving dissolution in solvents like DIBK, MIBK, or xylene, and provides optimal furnace program parameters, specifically ashing temperatures (700°C for Iron/Copper, 800°C for Nickel), to ensure accurate results by minimizing background signals while preventing analyte loss.
The total dispensed volume should be less than 15 pL to avoid requiring very long drying and ashing times.
A suitable dilution is 1 g of sample per 5 mL of solution to balance concentration and precipitation risks.
The optimal ash temperatures are 700 °C for iron and copper, and 800 °C for nickel.