| Determination method | Oil mass (g) | Solvent/mL (volume ratio) | Titrant | Acid value (mg KOH/g) |
| National standard GB/T 5009.37-2003 | 3.0 - 5.0 | 50 mL (Diethyl ether:ethanol = 2:1) | 0.05 mol/L KOH aqueous solution | 31.1 |
| National standard GB/T 5530-2005 | 0.5 | 50 mL (Ethanol) | 0.1 mol/L KOH aqueous solution | 31.1 |
| National standard SN/T 0801.19-1999 | 0.5 | 50 mL (Diethyl ether:95% Ethanol = 1:1) | 0.1 mol/L KOH aqueous solution | 31.1 |
| This work | 0.5 | 30 mL (Petroleum ether:ethanol = 2:1) | 0.1 mol/L KOH aqueous solution | 31.2 |