Determination of Heavy Metal Elements in Edible Olive Oil by ICP-MS
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Abstract:
This paper established a simple method for the determination of Cr, Ni, As, Cd, Hg and Pb in olive oil by using inductively coupled plasma mass spectrometry (ICP-MS). The olive oil was diluted with n-propanol/xylene (70:30, V/V), then the above six heavy metal elements in the sample were analyzed directly by ICP-MS. Organic sample could keep stable in n-propanol/xylene solution for a long time in order to satisfy the multi-element determination requirement. A small amount of oxygen added into the argon gas line to prevent the deposition of carbon on the sampling cone, which might lead to the clogging of the orifice and a reduction in sensitivity. The use of octopole reaction system (ORS) eliminated the interference of polyatomic ions dramatically. The matrix effects and the instrument drift commendably calibrated with Rh as internal standard element. Under the optimal conditions, the detection limits for six heavy metal elements were in the range of 17.58~53.81 ng/L. In addition, the recoveries of standard addition were from 94.00% to 107.00% and the RSD were 1.33~2.80%.
