Multielemental Analysis of Camellia Oil by Microwave Dry Ashing and Inductively Coupled Plasma Mass Spectrometry

A simple and practical method is reported for the determination of Mg, Ca, Cr, Mn, Fe, Co, Ni, Cu, Zn, and Pb in camellia oil by inductively coupled plasma-mass spectrometry (ICP-MS). Camellia oil was treated using microwave dry ashing at 380 degree Celsius for carbonization and 550 degree Celsius for ashing in a 110 minute procedure. The operational conditions of the dynamic reaction cell with ammonia as the reaction gas were optimized to minimize interferences. The recoveries and the relative standard deviations of optimized method were between 85.6 and 98.4 percent and 1.1 and 5.5 percent, respectively. The detection limits for Mg, Ca, Cr, Mn, Fe, Co, Ni, Cu, Zn, and Pb were 31, 48, 0.6, 4, 22, 0.4, 0.6, 0.9, 3, and 1 micrograms per kilogram, respectively. The developed method has significant potential for the determination of metals in edible oils.