Submicrodetermination of alkoxyl groups using microbalance

Abstract

A submicromethod for the determination of alkoxyl groups is described. This is a modification of the micromethod previously reported by this author. In the proposed method, a sample (0.30.5 mg) is weighed in a platinum boat by means of a micro balance and heated with hydriodic acid in a reaction flask. The alkyl iodide formed is burned into iodine. The iodine is absorbed by a silver plate and weighed. The errors that may appear in this method are minimized. The standard deviation is 0.21% (for CH₃O) or 0.25% (for C₂H₅O). This submicromethod can be carried out with the same apparatus for the previous micromethod except for the combustion tube reduced to mm in its inside diameter.