Correlation Between Two Methods for Determining Oxygen Numbers of Feather Filling Materials

摘要

The correlation between two methods of determining the cleanliness of feather filling materials has been determined. Both methods determine the 'oxygen number' by titrating a water extract of the filling materials with a dilute potassium permanganate solution. The methods differ in the manner of preparing the water extract, and determination of the end point. In one method used by the Federal Government, the endpoint is determined visually. In the other method, used by the Laboratory of the Bureau of Furniture and Bedding Inspection, State of California, the endpoint is determined by a colorimeter. It was found that the two methods have a high degree of correlation, with a correlation coefficient of 0.982. (Author)