รายละเอียดเอกสาร

This method determines, by a gravimetric procedure, polyethylene and other plastic polymers present as contaminants in fats and oils. This method is applicable to animal fats, other fats, and vegetable oils containing polyethylene. For rendered fats, protein could be an interference. Soaps may interfere, causing high results; however, the initial precipitation from an acid solution is designed to minimize the interference due to soaps. The probable limitation of the method for normal polyethylene is 50 mg/kg (50 ppm). The effect of the presence of biodegradable plastic materials in fats and oils is yet to be determined.