| Research Abstract |
Ion-pair extraction is one of the basic principles of solid-phase extraction. We showed that the solvophobic theory is effective to interpret the linear additive representation of the logarithm of ion-pair extraction constant with individual contribution of cation, anion and organic solvent.
Some of simple and rapid analytical methods based on solid-phase extraction on membrane filter were developed as below. 1. Extraction and separation of cationic surfactant from river sediments as an application to a spectrophotometric determination of cationic surfactant in an aqueous environment using membrane filters without the interference of anionic surfactant and adsorption on the surface of sediments et al. 2. Nearly almost anionic surfactant contains sulfur atom in the molecule. It is possible to determine the total anionic surfactants by X-ray fluorescence measurement of sulfur concentration on a membrane filter after collection as an ion associate with cationic surfactant. 3. Formaldehyde in the air was absorbed in aqueous solution and reacted with 4-amino-3-hydrazino-5-mercapto-l,2,4-triazole to form purple anionic dye and collected on a membrane filter as ion associate with organic hydrophobic cation. The intensity of color on the membrane filter was measured by tristimulus colorimeter.
Spectrophotometry is very useful and popular analytical method. Recently DC/AC converter for car battery is convenient to use popular spectrophotometer on outside. Some kind of battery drive portable spectrophotometer is also useful. However, it needs to make solution for measurement.
In the case of tristimulus colorimetry, the calibration curve is not linear, bend; this method is simple and rapid, highly sensitive, no waste of organic solvent. As the used tristimurus colorimeter is small, light, portable and battery driven, it is possible to use it on-site of sampling place. This tristimurus colorimeter will be powerful tool for the on-site analysis.
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