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Evaluation of uncertainty in determination of lead in edible vegetable oils by microwave digestion-graphite furnace atomic absorption spectroscopy
  
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KeyWord:edible vegetable oil  trace lead  microwave digestion  evaluation of uncertainty  graphite furnace atomic absorption spectroscopy
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XIONG Weilin .College of Food Science and Technology, Hunan Agricultural University，Changsha 410128, China
 
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Abstract:
      The uncertainty source was determined by microwave digestion-graphite furnace atomic absorption spectrometry in the determination of trace lead in edible vegetable oil, and the uncertainty component was quantitatively evaluated to determine the relative standard uncertainty and expanded uncertainty. The results showed that the uncertainty in the determination of trace lead in edible vegetable oil by microwave digestion-graphite furnace atomic absorption spectrometry mainly came from three aspects: the calibration of measuring instruments, the fitting of standard curve, reading of the laboratory technicians and the repeatability of instrument measurement, and their relative standard uncertainties were 0.048, 0.022, 0.016 and 0.013 respectively. When the sample mass was 0.500 1 g, the lead content was 0.024 mg/kg, k=2(confidence of 95%), the expanded uncertainty was 0.003 mg/kg, the measurement result could be expressed as (0.024±0.003) mg/kg.
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