Study on 18 Heavy Metal Elements in Oral Liquid Health Foods
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Abstract:
A kind of heavy metal elements (Pb, Cd, As, Hg, Cu, Pt, Pd, Ir, Rh, Ru, Os, Mo, Ni, Cr, V, Mn, Fe, Zn) in oral liquid health foods derived from Chinese herbal medicine based on inductively coupled plasma mass spectrometry (ICP-MS) was established in this work. The oral liquid samples were pre-treated by microwave digestion. The Ge, In and Bi elements were used as the internal standard elements for correcting the matrix effect and signal drift. The contents of 18 heavy metals in ten batches of samples were determined by ICP-MS. Results showed that good linear relations of 18 heavy metal standard curves were found, R2≥0.999, the detection limit of each element was between 0.0001~2.743 ng/mL, the precision RSD was between 0.49%~4.29%, and the repetitive RSD value was between 1.2% and 15%, the recovery rate of the sample was between 82.74% and 122.7%. The 18 heavy metal elements in the two oral liquids were not exceeded. Results showed that this method is easy to operate, fast in analysis, high in sensitivity and good in accuracy. It is suitable for the detection of heavy metals in oral liquid health foods, and can provide a basis for health food safety evaluation.
