| A linear absorbance mixing model of adulterated olive oil was presented to quantitatively analyze the proportion of adulterated oil based on an equation derived from the Lambert-Beers Law. According to theory of errors, the calculation error of adulteration proportion was analyzed, and the minimal detection error could be obtained at the wavelength where the difference between absorbances of olive oil and adulterated oil was the largest. A VIS/NIR spectrum acquisition system was assembled to validate the adulteration proportions of corn oil, peanut oil and soybean oil adulterated in olive oil. The results showed that the relative errors between calculation values and actual adulteration proportion values were less than 5% for adulteration proportions above 10%, and correlation coefficients were respectively 0.999 2, 0.999 6 and 0.999 7 with root-mean-square errors of 0.008 2, 0.005 9 and 0.005 1, which proved that the method of calculating adulteration proportions of adulterating other oils in olive oil was correct based on the linear absorbance mixing model. |
