METHOD FOR THE QUANTITATIVE-DETERMINATION OF 1-NAPHTHALENEACETIC ACIDIN SPIKED CANNED PINEAPPLE SAMPLES BY MICELLE-STABILIZED ROOM-TEMPERATURE PHOSPHORESCENCE

This paper presents a convenient method for the determination of 1-nap hthaleneacetic acid (NAA) plant growth regulator in spiked canned pine apple samples by micellar-stabilized room temperature phosphorescence with sodium dodecyl sulfate as a micellar medium, thallium nitrate as an external heavy atom, and sodium sulfite as an oxygen scavenger. A m ultivariate optimization approach using the type of central composite blocked cube-star design was carried out. The analytical curve of NAA gives a linear dynamic range of 70-500 ng mL(-1) with a detection limi t of 21 ng mL(-1) and precision of 2.37% (n = 7). A mean recovery valu e of 98.6% was obtained for 250 ng mL(-1) NAA in the pineapple samples .