Abstract
The separation and streaming-current detection of strong acids were studied on a model extraction solution of tributyl phosphate which contains, in addition to others, dibutyl and monobutyl phosphates and orthophosphoric acid. All the components of the sample, starting from hydrocarbons and ending with orthophosphoric acid, can be separated within 10 min, provided that silica gel with a large surface area, treated with perchloric acid, is used as a column packing. 2-Propanol—heptane (15:85), saturated to 30% with water, is used as mobile phase. The streaming current can be sensed from a chromatographic column. Phosphoric acids are detected selectively, with a sensitivity of 1–2 orders of magnitude higher than in refractometric detection.
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