Detection of multiple anions by thin-layer chromatography |
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Authors: | Kato Noriyuki Sakayanagi Masataka Nakayama Takahiro Nishimura Hideo Ogamo Akira |
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Affiliation: | Scientific Criminal Investigation Laboratory, Kanagawa Prefectural Police Headquarters, Yokohama, Japan. |
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Abstract: | A novel detection method for 21 different anions by thin-layer chromatography is presented. Anions on the target plate form salts with amine in a developing solvent and are visualized after staining with citric acid-acetic anhydride reagent as white spots contrasting against a pale red-pink background. This method has particularly high sensitivity for anions of chlorate, sulfate, phosphate, chromate and dichromate (0.02-0.05 microg). The method is demonstrated to efficiently detect toxic arsenite in curry sauce as an example application. The proposed method offers highly efficient indirect detection for a wide range of anions, and serves as a purification procedure for the preparation of anionic sample solutions for other analytical methods. |
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