Fluorimetric determination of tin at the nanograms per millilitre level in canned beverages

Abstract

Diacetylmonoxime nicotinylhydrazone reacts with tin to produce a 2:1 fluorescent complex (λ_ex. 420, λ_em. 520 nm). A detailed study of the characteristics of this complex has been carried out and a fluorimetric method for the determination of tin at the 5–150 ng ml^–1 level is proposed. The method has a detection limit of 2.1 ng ml^–1, a precision of about 1% on 70 ng ml^–1, is very selective and has been applied satisfactorily to the determination of tin in canned beverages without preliminary digestion of the sample.