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Arsenic Speciation in Fruit Juices and Rice

Following reports that an alarming 10% of apple juice products were found to contain toxic levels of arsenic, the FDA swiftly responded by implementing more stringent concentration limits and testing requirements for this poisonous element in foodstuffs. Analysis of arsenic is made challenging due to diverse sample matrices.  To circumvent these problems, an HPLC-ICP-MS method has been developed using ion-exchange chromatography on a Hamilton PRP-X100 column. The rugged, 55% cross-linked stationary phase of the PRP-X100 column resists shrinking and swelling in organic solvents is fully stable throughout the entire pH range, making it an ideal solution for arsenic speciation in juice, which may be analyzed directly, or grain samples, such as rice, which require preliminary acid digestion.