It is well known that solubility of antioxidants in biodiesel is poor.
Please suggest some methods for measuring the solubility
Consider the factors
1. Antioxidant concentration is very small ( 1000 ppm)
2. Antioxidant and biodiesel has almost same colour ( checking the physical separation is not easy)
5. Viscosity of antioxidant is around 5 mm^2/s
You did not name the antioxidant and your question does not have an answer
You can measure total antioxidant status ( TAS ) of oils using EREL's TAS method and/or kit.
www.relassay.com.
Detection of oxidants Is complicated by the presence in the sample of antioxidants, which react with the oxidation product of the reagent. The result can not be considered correct. How can this be taken into account?
Please read part II in the book
Oxidation and Antioxidants in Organic Chemistry and Biology
Evgeny T. Denisov, Igor B. Afanas'ev
you can get it in
http://survival-training.info/Library/Chemistry/Chemistry%20-%20Oxidation%20and%20Antioxidants%20in%20Organic%20Chemistry%20and%20Biology%20-%20E.%20Denisov,%20I.%20Afanasev.pdf
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