The Evaluation and Selection of Uncorrelated Paired Solvent Systems for Use in the Comparison of Textile Dyes by Thin-Layer Chromatography

    Volume 26, Issue 3 (July 1981)

    ISSN: 0022-1198

    CODEN: JFSOAD

    Published Online: 1 July 1981

    Page Count: 20


    Harris, H
    Criminalist and director, New York City Police Laboratory, New York, N.Y.

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

    Resua, R
    Criminalist and director, New York City Police Laboratory, New York, 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 (Rf 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.


    Paper ID: JFS11393J

    DOI: 10.1520/JFS11393J

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    Title The Evaluation and Selection of Uncorrelated Paired Solvent Systems for Use in the Comparison of Textile Dyes by Thin-Layer Chromatography
    Symposium , 0000-00-00
    Committee E30