Abstract
This paper presents a convenient method for the determination of 1-naphthaleneacetic acid (NAA) plant growth regulator in spiked canned pineapple 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 multivariate 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 limit of 21 ng mL(-)(1) and precision of 2.37% (n = 7). A mean recovery value of 98.6% was obtained for 250 ng mL(-)(1) NAA in the pineapple samples.
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