Test method for identifying cooking oil mixed with hogwash oil
The invention relates to a test method for identifying cooking oil mixed with hogwash oil. The method comprises the following steps: precisely weighing a sample and placing the sample into a porcelain crucible, adding nitric acid, carbonizing on an adjustable electric hot plate with soft fire till n...
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Format: | Patent |
Sprache: | chi ; eng |
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Zusammenfassung: | The invention relates to a test method for identifying cooking oil mixed with hogwash oil. The method comprises the following steps: precisely weighing a sample and placing the sample into a porcelain crucible, adding nitric acid, carbonizing on an adjustable electric hot plate with soft fire till no smoke comes out, and then transferring to a muffle and ashing to off-white at 550 DEG C, wherein the bulking value ratio of nitric acid to the sample to be tested is 1:1; dissolving ash content with 0.5mol/L nitric acid, transferring to a 25ml colorimetric tube, adjusting the constant volume of the colorimetric tube to a scale value, and testing the contents of main heavy metal elements by using an ICP-MS (inductively coupled plasma mass spectrometer). By comparing the tested results, whether the sample is mixed with hogwash oil can be identified. The ICP-MS method can test almost all elements in cooking oil and has higher sensitivity; meanwhile, by the method, samples of cooking oil with a low content of hogwash |
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