The aim of this study was to conduct a survey of arsenic content in infant rice cereals and rice flours purchased at US supermarkets. The rice samples were analyzed for arsenic (As) speciation by high performance liquid chromatography (HPLC) connected to inductively coupled plasma mass spectrometry (ICP-MS) to determine inorganic arsenic (iAs) as the sum of two inorganic forms of arsenic, arsenite (AsIII) and arsenate (AsV). The organic form of As, monomethylarsonic acid (MMA) and dimethylarsinic acid (DMA) were also determined. Levels of iAs greatly varied among all infant rice cereals and rice flours. There was no significant difference (P>0.05) in iAs levels between organic and conventional rice cereals. The major organic arsenic species was DMA. MMA was either not detected or only trace levels were found. The LOD values for As species ranged from 0.9 �g/kg to 1.7 �g/kg, and LOQ from 7 �g/kg to 14 �g/kg.

Arsenic speciation in infant rice cereals and rice flours using HPLC-ICP-MS

245th National Meeting (2013)

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