Determination method of acid value and peroxide value of vegetable oil
In order to solve the problem of solvent safety in the determination of acid value and peroxide value of vegetable oil by national standard method,using walnut oil as experimental material,a method was established to determine the acid value and peroxide value of vegetable oil by replacing ethyl ether and trichloromethane in GB 5009.229-2016 and GB 5009.227-2016 with petroleum ether and dichloromethane,which were safer and easily available,respectively.The precision of the method was investigated.The acid values and peroxide values of four vegetable oils were determined by national standard method and the established method,and the results were subjected to t-test to examine the accuracy of the method.The results showed that the acid value and peroxide value of walnut oil were determined 6 times in parallel,the RSD values of the established methods were 2.055％ and 1.318％,respectively.The p-values of acid values and peroxide values of the four vegetable oils by national standard method and the established method were all greater than 0.05,showing no significant difference between the two methods.The established method is characterized by better precision and accuracy,and improves assay safety,so it can be used for the determination of acid value and peroxide value of vegetable oil.
NETL
NSTL
万方数据
