ISSN: 0022-1198
CODEN: JFSCA
Published Online: 1 July 1981
Page Count: 20

The Evaluation and Selection of Uncorrelated Paired Solvent Systems for Use in the Comparison of Textile Dyes by Thin-Layer Chromatography
Harris, H
Criminalist and director, New York City Police Laboratory, N.Y.

DeForest, PR
Professor of criminalistics, John Jay College of Criminal Justice, N.Y.

Resua, R
Criminalist and director, New York City Police Laboratory, N.Y.

(Received 16 October 1980; accepted 1 December 1980)

Abstract

This paper describes a systematic approach to the evaluation and selection of paired solvent systems for the comparison of dyes extracted from textile fibers by thin-layer chromatography (TLC). The use of two solvent systems, unless relatively uncorrelated, may offer little if any more information than a single solvent system. Ten paired solvent systems are evaluated mathematically (correlation coefficients) and graphically (R^f values of the major dye components). The ability of the individual solvent systems to separate minor colored dye components in “pure” commercial dyes (resolving power) is also considered. Fifty-six commercial acid and basic solid dye samples are used. In addition, acid and basic dyes extracted from 30 black nylon and acrylic fiber samples containing different lots of “identical” dye mixtures are separated. A comparison of the theoretical and actual discriminating power of the solvent systems is then presented. The method is general and may be applied in the selection of paired solvent systems for use in TLC of any usage class of textile dye.

Keywords:
criminalistics, dyes, chromatographic analysis

Paper ID: JFS11393J
DOI: 10.1520/JFS11393J
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