EXPERIMENTAL STUDIES OF THE FACTORS THAT INFLUENCE 1-NAPHTHALENEACETAMIDE DETERMINATION BY MICELLE-STABILIZED ROOM-TEMPERATURE PHOSPHORESCENCE

A micelle-stabilized room-temperature phosphorescence (MS-RTP) method was developed for the determination of the phytohormone 1-naphthalenea cetamide residues in fortified pear samples, The proposed method is ba sed on the use of a micellar medium obtained by the surfactant sodium dodecyl sulfate in the presence of thallium nitrate as an external hea vy atom salt. To avoid oxygen quenching, sodium sulfite solution was u sed, To establish the optimum experimental variables, a complete and e xhaustive statistical analysis of the experimental data by a multivari ate optimization approach was performed. MS-RTP spectra were obtained and successfully used to determine 1-naphthaleneacetamide by the estab lished method without further separation, with a detection limit of 25 ng ml(-1). The precision (RSD less than or equal to 2.55%) and recove ry (greater than or equal to 91.9%) were satisfactory.