Univariate and simplex optimization for the flow-injection spectrophotometric determination of copper using nitroso-R salt as a complexing agent.
A simple colorimetric flow-injection system for the determination of Cu(II) based on a complexation reaction with nitroso-R salt is described. The chemical and FIA variables were established using the univariate and simplex methods. A small volume of Cu(II) was mixed with merged streams of nitroso-R salt and acetate buffer solutions. The absorbance of the complex was continuously monitored at 492 nm. The calibration curve over the concentration range 1.0-7.0 microg ml(-1) was obtained. The relative standard deviation for determining 4.0 microg ml(-1) Cu(II) was 0.47% (n = 11). The detection limit (3sigma) was 0.68 microg ml(-1) and the sample throughput was 150 h(-1). The validity of the method has been satisfactorily examined for the determination of Cu(II) in wastewater and copper ore samples. The accuracy was found to be high, because the student t-values were calculated to be less than the theoretical values when the results were compared with those obtained by FAAS.
Purachat
B
B
Department of Chemistry Faculty of Science, Chiang Mai University, Thailand.
Liawruangrath
S
S
Sooksamiti
P
P
Rattanaphani
S
S
Buddhasukh
D
D
D002138:Calibration; D002412:Cations; D003300:Copper / Q000032:analysis* / Q000493:pharmacokinetics; D006863:Hydrogen-Ion Concentration; D007477:Ions; D009603:Nitroso Compounds / Q000032:analysis* / Q000493:pharmacokinetics; D012680:Sensitivity and Specificity; D013053:Spectrophotometry / Q000295:instrumentation / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000032:analysis
D002412:Cations; D007477:Ions; D009603:Nitroso Compounds; D014874:Water Pollutants, Chemical; D003300:Copper