| 摘要 |
A process for the production of collection columns for carbonyl compounds which exhibit low blank values and enable easy and simple analysis of carbon yl compounds (such as formaldehyde) contained in a gas or water with high sensitivity and high accuracy, characterized by comprising the step of bringing a cation exchanger packed in a column into contact with a hydrophil ic solvent or a mixed solvent containing the same, the step of bringing the resulting cation exchanger into contact with a solution of a compound represented by the general formula (1) or a salt thereof to make the compoun d held on the cation exchanger, and the step of washing the resulting cation exchanger with a hydrophilic solvent or a mixed solvent containing the same at least twice: (1) wherein R1, R2, R3, R4, and R5 are each independently hydrogen, halogeno, alkyl, haloalkyl, alkoxyl, haloalkoxyl, aryl, or haloary l; and R6 and R7 are each hydrogen or alkyl (with the proviso that when R6 and R7 are each hydrogen, at least one of R1, R2, R3, R4, and R5 is not fluoro.</SD OAB> |
