INQUISAL 20936
INSTITUTO DE QUIMICA DE SAN LUIS "DR. ROBERTO ANTONIO OLSINA"
Unidad Ejecutora - UE
artículos
Título:
Factorial designoptimizationofexperimentalvariablesintheon-line separation/preconcentration ofcopperinwatersamplesusingsolidphase extraction andICP-OESdetermination
Autor/es:
LUIS ESCUDERO; S.CERUTTI; R.A.OLSINA; J.A.SALONIA; J.A.GASQUEZ
Revista:
JOURNAL OF HAZARDOUS MATERIALS.
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Año: 2010 vol. 183 p. 218 - 223
ISSN:
0304-3894
Resumen:
An on-linepreconcentrationprocedureusingsolidphaseextraction(SPE)forthedeterminationofcopperin differentwatersamplesbyinductivelycoupledplasmaopticalemissionspectrometry(ICP-OES)isproposed. Thecopperwasretainedonaminicolumnfilledwithethylvinylacetate(EVA)atpH8.0withoutusing anycomplexingreagent.Theexperimentaloptimizationstepwasperformedusingatwo-levelfullfactorial design.TheresultsshowedthatpH,sampleloadingflowrate,andtheirinteraction(atthetestedlevels) werestatisticallysignificant.Inordertodeterminethebestconditionsforpreconcentrationanddetermination ofcopper,afinaloptimizationofthesignificantfactorswascarriedoutusingacentralcomposite design(CCD).Thecalibrationgraphwaslinearwitharegressioncoefficientof0.995atlevelsnear thedetectionlimituptoatleast300gL−1. Anenrichmentfactor(EF)of54withapreconcentrationtime of187.5swasobtained.Thelimitofdetection(3) was0.26gL−1. Thesamplingfrequencyforthedeveloped methodologywasabout15samples/h.Therelativestandarddeviation(RSD)forsixreplicatescontaining 50gL−1 of copperwas3.76%.Themethodologywassuccessfullyappliedtothedeterminationof Cuintap,mineral,riverwatersamples,andinacertifiedVKIstandardreferencematerial.
