Abstract
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 language | English |
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Pages (from-to) | 97-105 |
Number of pages | 9 |
Journal | Journal of Chromatography A |
Volume | 724 |
Issue number | 1-2 |
DOIs | |
Publication status | Published - 16 Feb 1996 |
Keywords
- coals
- mobile-phase composition