Application of the Specific Gravity Gradient Column to the Quantitative Determination of Additives in a Base Material

Abstract

The requirements for, and limitations of, a method of quantitative estimation of additives in a base material, measured by differences in density, are set forth. The specific gravity gradient column of Linderstrom-Lang is described and discussed in terms of its range, sensitivity, stability, and calibration. The bearing which these factors have on the method is illustrated by an example in which the concentration of a melamine resin, applied to a wool flannel for control of shrinkage, is determined.

Density Gradient Techniques.

“…Acetylation of cotton fibers, however, results in a decrease in density corresponding to the low density of the esterified cellulose as compared with the unmodified cellulose (69, 65). The density gradient column is also useful in textile chemistry for the routine determination of concentration of sizing and other additives (79) as well as for studying the effects on industrial treatment of the fibers (5).…”