| When observing oil freezing test, the results generally use such as ‘clarification’‘precipitation’‘haze’ terms to express, which depends on the persons subjectivity and has poor repeatability and reproducibility. A method of quantitative analysis of oil transparency through determination of turbidity value in different oil states in oil freezing test by turbidimeter was established. Using samples with similar color and avoiding samples bubbling, the turbidity value was determined. The results showed that at normal temperature, the greater the turbidity value of palm oil, the more turbidity sample appearance. At low temperature, the turbidity values of palm oil and blend oil containing palm oil increased with time prolonging, at the same time, phenomenon of precipitation, haze and turbidity occurred. The method had advantages of simple, short detection time and reliable result, which could effectively reduce the subjective judgment difference, and had a good effect. |
