title: Spectrofotometric determination of copper in sugar cane spirit using biquinoline in the presence of ethanol and Triton X-100.
abstract: The present paper proposes a method for molecular spectrophotometric determination of copper in sugar cane spirits. The copper(I) reacts with biquinoline forming a pink complex with maximum absorption at 545 nm. The reaction occurs in the presence of hydroxylamine, ethanol and Triton X-100 tensioative. Determination of copper is possible in a linear range 0.2-20.0 mgL(-1) with a detection limit 0.05 mgL(-1). The great advantages of the proposed methodology are the elimination of liquid-liquid extraction step and the use of toxic organics solvents, like dioxane, to dissolve the reagent.
authors.affiliation: Departamento de Química Analítica, Instituto de Química, Universidade Federal da Bahia, Campus Universitário Ondina, 40170290 Salvador, BA, Brazil. pgquim@ufba.br
authors.forename: Sarah Adriana
authors.initials: SA
authors.lastname: do Nascimento Rocha
authors.forename: Alaílson Falcão
authors.initials: AF
authors.lastname: Dantas
authors.forename: Helena Valli
authors.initials: HV
authors.lastname: Jaeger
authors.forename: Antônio Celso Spínola
authors.initials: AC
authors.lastname: Costa
authors.forename: Elsimar dos Santos
authors.initials: Edos S
authors.lastname: Leão
authors.forename: Mara Rúbia
authors.initials: MR
authors.lastname: Gonçalves
mesh_terms: D000438:Alcohols / Q000737:chemistry; D003300:Copper / Q000737:chemistry*; D003902:Detergents / Q000494:pharmacology*; D004146:Dioxanes / Q000737:chemistry; D000431:Ethanol / Q000032:analysis / Q000737:chemistry / Q000494:pharmacology*; D006863:Hydrogen-Ion Concentration; D019811:Hydroxylamine / Q000737:chemistry; D008956:Models, Chemical; D017830:Octoxynol / Q000494:pharmacology*; D009930:Organic Chemicals / Q000737:chemistry; D011804:Quinolines / Q000737:chemistry*; D031786:Saccharum / Q000378:metabolism*; D012997:Solvents / Q000737:chemistry; D013053:Spectrophotometry / Q000379:methods*; D013056:Spectrophotometry, Ultraviolet / Q000379:methods*
chemical_list: D000438:Alcohols; D003902:Detergents; D004146:Dioxanes; D009930:Organic Chemicals; D011804:Quinolines; D012997:Solvents; D019811:Hydroxylamine; D000431:Ethanol; D003300:Copper; D017830:Octoxynol; C025223:1,4-dioxane