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Abstract Based on ultrasound-assisted extraction, a method for determination of inorganic arsenic in various supplementary food for infants and young children was established. The samples were successively subjected to ultrasonic extraction, n-hexane purification, membrane filtration, and anion column (PRP-X 100, 10 μm, 4.1 mm×250 mm) separation. Then, 15 mmol/L diammonium hydrogen phosphate solution (pH=6.0) was used as the mobile phase.
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