A simple, selective, and sensitive heavy atom induced room temperature phosphorimetric method (HAI-RTP) is described for the determination of the plant growth regulator β-naphthoxyacetic acid (NOA) in spiked apple samples. A careful selection of the different variables (heavy atom and sodium sulfite) to obtain the phosphorescence signal constitutes the basis of a HAI-RTP method for the determination of NOA. The analytical curve of NOA gives a linear dynamic range of 0−625 ng mL - 1 and a detection limit of 30.5 ng mL - 1 . A recovery of 108.8% was obtained for 500 ng mL - 1 NOA in spiked apple samples.
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Blanco et al. (1998) studied this question.
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