Spectrophotometric Determination of N-3-Pyridylmethyl-N'-p-nitrophenyl Urea in Rodenticide

흡광광도법(吸光光度法)에 의(依)한 살서제(殺鼠劑) N-3-Pyridylmethyl-N'-p-nitrophenyl Urea(RH-28787)의 정량(定量)

Microanalysis of rodenticide by visible absorption method was attempted. The following procedure was found to be very simple and to give accurate results. RH-28787 was added to dimethylformamide (DMF), and extracted after stirring for about 20 minutes in extractor $(30^{\circ}C)$. After extraction, the absorbance of DMF solution, was measured at 346 nm by using spectrophotometer. The result agrees closely with the experimentally determined value by means of the gas chromatograph.