Summary Possible spectrophotometric methods which could replace the present system of grading crude green soybean oils are given below in order of convenience. The limits are approximate values. Measurement of optical density of crude oils at 700 mμ in 21.8‐mm. tubes. Grade 2 limits would be at optical densities of 0.5 and 0.7 Measurement of refined oils at 690 mμ in 21.8‐mm. tubes. The limits for Grade 2 would be at optical densities of 0.4 and 0.6. Measurement of refined oil at 670 mμ in 8.0‐mm. tubes. Limits would be at optical densities of 0.4 and 0.6. Measurement of refined and bleached oils at 670 mμ in 21.8‐mm. tubes. Limits would be at optical densities of 0.1 and 0.7. Measurement of optical density of crude oils at 670 mμ in approximately 4‐mm. I.D. tubes. Limits would be at optical densities of 0.4 and 0.7. Measurement of optical density at 670 mμ of crude oils in 15% solutions of oil in carbon tetrachloride in 21.8‐mm. tubes. Limits would be at optical densities of 0.5 and 0.7.
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Melvin et al. (1953) studied this question.