| 초록 |
A simple colorimetric method based on azo-coupling reaction was developed for rapid detection of carbaryl pesticides or 1-naphthyl methylcarbamate. By pretreating carbaryl pesticides with an organic base, the resulting 1-naphthol readily reacted with a diazonium, resulting in a dramatic color change. Since the resulting azo dye is highly pH dependent, phosphoric acid was added to the test solution to minimize the colorimetric response to base used to pretreat the pesticides. We report that this colorimetric method has a rapid response time of less than one mininute with selective detection of carbaryl pesticide from other carbamates pesticides. Moreover, limit of detection (LOD) for carbaryl (＜8 ppm) is lower than permissible exposure limit (~10 ppm). Finally, in order to prove feasibility of estimating the concentration of pesticide in real fruit sample, we measured concentration of carbaryl in apple sample at the presence of natural interferences. |
