title: Simultaneous determination of cobalt and palladium in micellar media using H-point standard addition method and partial least square regression.
abstract: A simple, sensitive and selective spectrophotometric method for the simultaneous determination of Co(II) and Pd(II) using partial least square (PLS) calibration and H-point standard addition method is described. The method is based on the complex formation of Co(II) and Pd(II) with 4-(2-pyridylazo) resorcinol (PAR) in acidic media and in the presence of sodium dodecyl sulfate (SDS) as a micellizing agent. Acidic media and the presence of a micellar system improve selectivity and sensitivity, respectively. By applying PLS calibration, Co(II) and Pd(II) can be determined in the range of 0.20-2.0 and 0.40-4.0 microg ml(-1), respectively. The relative errors of prediction for the determination of Co(II) and Pd(II) in the 10 prediction samples were 1.69 and 1.72%, respectively. The results of applying H-point standard addition method show that Co(II) and Pd(II) can be determined simultaneously with concentration ratio of Co(II) to Pd(II) varying between 7:1 and 1:8 in the mixed samples. Both proposed methods (PLS and HPSAM) were applied to the determination of Co(II) and Pd(II) in several alloy solutions with satisfactory results.
authors.affiliation: College of Chemistry, Shahrood University of Technology, Shahrood, P.O. Box 316, Iran.
authors.forename: G
authors.initials: G
authors.lastname: Bagherian
authors.forename: M Arab
authors.initials: MA
authors.lastname: Chamjangali
authors.forename: H
authors.initials: H
authors.lastname: Eskandari
mesh_terms: D000497:Alloys / Q000737:chemistry; D003035:Cobalt / Q000032:analysis*; D016018:Least-Squares Analysis; D008823:Micelles; D010165:Palladium / Q000032:analysis*; D012118:Resorcinols / Q000737:chemistry; D012967:Sodium Dodecyl Sulfate / Q000737:chemistry; D013056:Spectrophotometry, Ultraviolet / Q000379:methods* / Q000592:standards*
chemical_list: D000497:Alloys; D008823:Micelles; D012118:Resorcinols; D012967:Sodium Dodecyl Sulfate; D003035:Cobalt; D010165:Palladium; C028398:4-(2-pyridylazo)resorcinol