A proposed non‐ashing technique employing ion‐exchange resins for the determination of lead in wine

Abstract

AbstractThe method proposed is to pass the wine (free from solid particles) down a Dowex‐50 column and elute with 4N‐HCl. The lead is determined in the eluate with dithizone.Recovery of added lead (2 p.p.m.) is 81–101% and results agree well with those by the iodine pentoxide method,2 although they are rather less consistent. Determinations require only 3 instead of 10 hours.The procedure is recommended for control purposes to establish if a sample contains less than the statutory limit of 1 p.p.m. of lead.