Study of the fluorescence of the lead-morin system in the presence of non-ionic surfactants

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Abstract
A study of the fluorescence of the Pb-morin system in the presence of the non-ionic surfactant Genapol PF-20 (ethylene oxide-propylene oxide condensate) has been made. The weak fluorescence of the Pb-morin system is enhanced about nine-fold, at a pH of 3.3 ± 0.2 with a surfactant concentration of 2%. The presence of a non-ionic surfactant also gives greater stability, the system being stable for at least 3 h. The excitation maximum occurs at 420 nm with fluoresence occurring at 495 nm. The fluorescence is linear up to 1 µg ml–1 of Pb, and the detection limit is found to be 0.06 µg ml–1. The precision at 1 p.p.m. of Pb(II) is ±0.47%. Al(III), Be(II), Zn(II) and Sn(II) strongly increase the fluorescence, probably owing to the formation of fluorescent complexes with morin, which are highly sensitised by the surfactant used, and F–, Fe(III) and Cu(II) decrease the fluorescence signal.

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