Multi-Element Analysis in Brown Rice by the Inductively Coupled Plasma Method

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Abstract
The determination of 17 elements (cadmium, zinc, lead, iron, cobalt, magnesium, aluminium, phosphorus, molybdenum, manganese, copper, chromium, nickel, strontium, calcium, barium and vanadium) in brown rice by inductively coupled plasma emission spectrometry (ICP) was investigated. Magnesium had a great influence on the analysis of other elements in the brown rice, but the resultant error could be avoided by correcting the analytical values based on calibration curves of the other elements in the presence of magnesium.This IPC method resulted in satisfactory reproducibilities for 14 elements (not lead, chromium or vanadium), giving relative standard deviations (RSD) within 0.3-5.0%. The reproducibilities for lead, chromium and vanadium were not so good, showing RSD values of 21.78%, 11.13% and 49.26%, respectively, due to their levels in the brown rice being extremely low. Adequate recoveries of 84-103% were observed for the 17 elements when added to digested brown rice solution.From these results, the ICP method appears to be excellent for multi-element analysis in brown rice.

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