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| Determination of lead, arsenic and copper in edible oil by ultrawave digestion-ICP-MS |
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| DOI： |
| KeyWord:ultrawave digestion ICP-MS edible oil heavy metal |
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| Abstract: |
| A ultrawave digestion - inductively coupled plasma mass spectrometry (ICP-MS) method for determination of lead, arsenic and copper in edible oil was established. Using 5 mL nitric acid, 1 mL hydrogen peroxide and 0.2 mL sulfuric acid as the digestion acid system, digestion programmed temperature 110,170,230 ?℃ in turn，the ultrawave digestion method was used to pretreat the edible oil，then ICP-MS was used to determine the lead, arsenic and copper in the edible oil. The results showed that there were good linear relationships of the standard curves within the mass concentrations of lead, arsenic and copper 0-50 ng/mL. The correlation coefficient, relative standard deviation (RSD) and recoveries were 0.999 6-1.000 0, 3.2%-8.3% and 82.1%-101.5%,respectively. The limits of detection were 05 ng/mL for lead, 0.1 ng/mL for arsenic and 0.1 ng/mL for copper. The method had the items of accuracy, fastness and convenience, and was suitable for the determination of lead, arsenic and copper in edible oil. |
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