In this test,the oil samples,seven edible oil and seven cooking waste oil,were pretreated by digestion of HNO_3 mixed with H_2O_2. The contents of metals,such as Ca、Mg、Fe、Cu、Zn、Mn、Pb、Cr,were determined by atomic absorption spectrometry. Results show that Ca、Mg、Fe、Cu、Zn、Mn were found in all samples. Pb、Cr were not determined in edible oil,but could be found in some cooking waste oil. Compared the metals in edibel oil and cooking waste oil,the contents of eight metals in waste oil were higher than those in ed...
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