Abstract: POV value is an important parameter for nuts qulity evaluation. In this paper, some factors influencing the POV detemimation were studied. The results showed that the extraction time of oil from nuts could cause the value varied greatly and the POV values would increase with the time lasting shorter. The better time was 8 hours in this test. The volatilization temperature of solvent has no obvious effect on the POV values. But in the extracted oil the residual solvent content was different caused by the extraction temperature, the higher temperature the lower residual solvent content. The sample oil should be weighted at the room temperature, and the error would increase with the temperature increasing.

Key words: POV values, walnut oil, determination of POV