Abstract
Phenylfluorone reacts with zinc in the presence of hexadecylpyridinium bromide and pyridine to form a water-soluble red chelate. The absorption maximum of the chelate is at 585 nm and its absorbance is constant in the pH range 7.7–8.2. At this wavelength, Beer's law is obeyed up to 1.53 × 10 −5 M zinc. The sensitivity is very high and the molar absorptivity is 8.0 × 10 4 l.mole −1.cm −1. The chelate has been utilized in the determination of zinc at the microgram level. The ratio of zinc to phenylfluorone in the complex is 1:1.
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