Size-exclusion chromatography of solubilised low-rank coal

J. P. Ralph, D. E.A. Catcheside

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    30 Citations (Scopus)


    Solubilised brown coal is a polydisperse and chemically heterogeneous polyanion. The parameters appropriate for estimation of its molecular mass (M(r)) by size-exclusion chromatography (SEC) using a stationary phase comprising glyceryl-propyl silica were investigated. Ion exclusion occurred when the ionic strength (I) was zero, being most pronounced for coal soluble at low pH. Reversed-phase partitioning appeared at low ionic strength. Non size-exclusion interactions were minimised when I was between 0 and 0.033. The estimates for the modal M(r) of solubilised coal ranged between 355000 and 33000. These values are consistent with ultrafiltration data, suggesting that SEC is a practical method for determining coal Mr.

    Original languageEnglish
    Pages (from-to)97-105
    Number of pages9
    JournalJournal of Chromatography A
    Issue number1-2
    Publication statusPublished - 16 Feb 1996


    • coals
    • mobile-phase composition


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