A method has been developed for the identification and determination of Eulan WA New (or Eulan U33) and Mitin FF High Cone, used as mothproofing agents on wool and wool blends. The mothproofing agent used is separated by solvent extraction from a sodium hydroxide solution of the wool and determined by u.v. spectrophotometry. The possibility of interfering impurities should not be overlooked. Such interferences have rarely been encountered in the author's laboratory, but can be detected by comparison of curve shapes.
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