A comparison of water solubilities by the flask and micro-column methods |
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| Authors: | Yoshikazu Hashimoto Keiko Tokura Kunio Ozaki WMJ Strachan |
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| Institution: | 1. Department of Applied Chemistry, Faculty of Science and Technology, Keio University, Hiyoshi, Yokohama 223, Japan;2. Environmental Contaminants Division, National Water Research Institute, Burlington, Canada |
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| Abstract: | A comparative examination of the two procedures of the OECD Test Guideline: Water Solubility was undertaken using carbazole, fluoranthene, anthracene, hexachlorobenzene, p-nitroaniline and diphenylamine. The flask method was modified to provide for dissolution of the solute from the surface of glass beads. By the proposed flask method, one can accurately measure the water solubility down to the order of 10 μg/L as well as those of the order of %. The micro-column method, which requires a number of concentration determinations to ensure that a saturated solution has been obtained, is recommended for the solubility range of 10 mg/L through 10 μg/L. The flask method using the procedures described in this study, covers the range of solubility above 10 μg/L with only two determinations one being a simple preliminary test and the other a precise measurement. |
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