title: Atomic absorption spectrophotometric determination of microgram quantities of copper in tea after solvent extraction.
abstract: An atomic absorption spectrophotometric method is described for determining trace amounts of copper in tea. The method is based on the solvent extraction of the metal as tetraiodocuprate (I), from 2 M HCl solutions of tea samples which contain 12% (w/v) KI, into methylisobutyl ketone. The organic extracts, containing the ion-association complex of copper are atomized into an air-acetylene flame. The limit of detection is 1.14 micrograms g-1 Cu.
mesh_terms: D003300:Copper / Q000032:analysis*; D004355:Drug Stability; D007202:Indicators and Reagents; D012997:Solvents; D013054:Spectrophotometry, Atomic; D013662:Tea / Q000032:analysis*; D013997:Time Factors
chemical_list: D007202:Indicators and Reagents; D012997:Solvents; D013662:Tea; D003300:Copper