Yellow, red, yellow, red

The result is: yellow, red

Smell and taste: (Test method: GB/T5525-2008)

Take a small amount of oil sample and pour it into a beaker, heat it to 50℃ and stir it with a glass rod while smelling it and taste it at the same time. This oil sample --------

Acid Value: (Test method: GB/T5009.37-2003)

The instrument used is analytical balance (d=0.1mg) Model: ****** Number: ********

Method description: Weigh 3.00g~5.00g of the sample into an Erlenmeyer flask, add 50ml of neutral alcohol ether, shake to dissolve, add 2 drops of phenolphthalein indicator solution (10g/L), and add hydrogen Titrate the sodium oxide standard titration solution until a slight red color appears and does not fade within 30 seconds.

C (NaOH) = mol/L m (mass of sample) = g

V (volume of NaOH consumed by sample) = mL

Acid value =

c×V×56.1

=

× ×56.1

=

m

C (NaOH) = mol/L m (mass of sample) = g

V (volume of NaOH consumed by sample) = mL

Acid value =

c×V×56.1

=

× ×56.1

=

m

Average : mg/g Rounded to: mg/g