| The extractant is adsorbed on the surface of an inert support and corresponds to the organic, stationary phase. |
| The tungsten is then stripped from the extractant into an ammonia solution containing ammonium tungstate. |
| Potassium hydroxide may also be used as an extractant but may not be used to fortify the potassium analysis. |
| During the countercurrent flow of the extractant through the solution, tungstate ions transfer from the aqueous phase to the organic phase. |
| Extraction of valeric acid was significantly enhanced by the presence of a carboxylic acid in the toluene extractant, or the aqueous feed, or both. |
| Process for isolating polyorganosiloxanes from an aqueous dispersion, which comprises separating the polyorganosiloxanes from the water in dissolved form by means of an extractant. |
