New device and method for rapidly identifying illegal cooking oil by use of discoloration method

New device and method for rapidly identifying illegal cooking oil by use of discoloration method

  • CN 104,749,176 A
  • Filed: 03/25/2015
  • Published: 07/01/2015
  • Est. Priority Date: 03/25/2015
  • Status: Active Application
First Claim
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1. a method for variable color method Rapid identification waste oil, is characterized in that:

  • it is as follows that described method comprises step;

    (1) prepare solvent system, solvent system is isopropyl alcohol and Ethanol System;

    (2) assay is determined;

    the terminal label that free fatty acid and potassium hydroxide react is the ethanolic solution of phenolphthalein;

    (3) get test tube A, inside have isopropyl alcohol, ethanolic phenolphthalein solution;

    (4) by the potassium hydroxide-ethanol solution in test tube B, join in test tube A with alkali lye pipettor, now test tube A is for being aubergine;

    (5) use oil sample sampler, get grease to be determined and join in described step (4) mediumpurple test tube A;

    (6) rock test tube, see that color changes, as aubergine disappears, illustrate that the acid value of oil sample is high;

    As aubergine stablize, place 2-3 minute still colour-fast, illustrate that the acid value of oil sample is lower than setting value.

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