Abstract
The influence of the organic modifier of the mobile phase, the ionic strength, the control of pH by different procedures, and the presence of tetrabutylammonium ion on the separation of seven isomeric dihydroxynaphthalenes and two quinones derived from them was studied by using silica gel modified chemically with octadecyls as a stationary phase. Substantial differences in the retention and in the selectivity of the separation with a change of the organic modifier or with a change in its concentration are caused by the contribution of the sttinary phase to the retention of the solutes under study. Anomalous broadening of peaks 2,3-dihydroxynaphthalenes in acetate buffer and in solution of sulphuric acid was ascribed to the formation of complexes with heavy metals deposited in the stationary phase.
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