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Determination of trace arsenic in edible vegetable oil by extractioncombined with dry ashing pretreatment
  
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KeyWord:vegetable oil  arsenic  trace extraction  synergism  dry ashing  determination
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ZOU Yandi，ZHOU Qingyan，ZHOU Shuangquan，etc  
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Abstract:
      A method for the determination of trace arsenic in vegetable oil by extraction combined with dry ashing pretreatment was developed. The accuracy of the method was verified by the detection limit, quantitative limit, method precision, method repeatability, standard recovery rate and sample comparison experiments. The results showed that the detection limit and quantitative limit of the method were 0.25 μg/L and 0.80 μg/L respectively. The relative standard deviation of method precision was 4.94%. The relative standard deviation of method repeatability was 8.54%. The recovery rate was 87.00%-11100%. The relative standard deviation of sample comparison results was less than 6.33%. The method established could be applied in the determination of trace arsenic in vegetable oil and the results were accurate and reliable.
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