A Simple Spectrophotometric Determination of Meptyldinocap by its Hydrolysis

摘要

A simple spectrophotometric method is proposed for the determination of meptyldinocap (2,4-dinitro-6-octylphenyl crotonate). The method is based on the hydrolysis of meptyldinocap by hydroxylamine solution in alkaline medium to give 2,4-dinitro-6-octylphenol (2,4-DNOP), having maximum absorption at 380 nm. The reaction is found to be instantaneous in presence of ethanol. Beer's law is valid over the concentration range of 1.2-13 μg mL~(-1) with molar absorptivity and Sandell's sensitivity of 3.22 x 10~6 mol~(-1)cm~(-1) and 0.0001 μgcm~(-2) respectively. The limit of detection and quantification were 0.0892 and 0.2703 μg mL~(-1), respectively. The tolerance limits of interfering ions are discussed. All variables were studied in order to optimize the reaction conditions. The validity of the method was checked by its simultaneous determination in fruits and water samples and the results were statistically compared with those of a reference method by applying the Student's t-test and F-test.