title: Determination of copper by isotopic dilution.
abstract: A rapid and selective method was used for the determination of copper by isotopic dilution employing substoichiometric extraction with dithizone in carbon tetrachloride. The appropriate pH range for the substoichiometric extraction was 2-7. In the analysis, even a large excess of elements forming extractable complexes with dithizone does not interfere. The accuracy and precision of the method were evaluated. The method has been applied to analysis of reference materials, wheat flour, wine, and beer.
authors.affiliation: Radiochemistry Division, Comissão Nacional de Energia Nuclear, São Paulo, Brasil.
authors.forename: E S
authors.initials: ES
authors.lastname: Faquim
authors.forename: C S
authors.initials: CS
authors.lastname: Munita
mesh_terms: D001515:Beer / Q000032:analysis; D002021:Buffers; D002251:Carbon Tetrachloride; D002614:Chelating Agents; D003300:Copper / Q000032:analysis*; D003301:Copper Radioisotopes / Q000032:analysis; D004230:Dithizone; D005433:Flour / Q000032:analysis; D006863:Hydrogen-Ion Concentration; D007202:Indicators and Reagents; D008460:Meat / Q000032:analysis; D018515:Plant Leaves / Q000737:chemistry; D011865:Radioisotope Dilution Technique; D012588:Scintillation Counting; D013885:Thiosulfates; D014920:Wine / Q000032:analysis
chemical_list: D002021:Buffers; D002614:Chelating Agents; D003301:Copper Radioisotopes; D007202:Indicators and Reagents; D013885:Thiosulfates; D004230:Dithizone; D003300:Copper; D002251:Carbon Tetrachloride; C017717:sodium thiosulfate