spectrophotometric simultaneous determination of nickel, cobalt and copper by orthogonal signal correction–partial least squares
نویسندگان
چکیده
a method for the simultaneous spectrophotometric determination of nickel, cobalt and copper based on theformation of their complexes with 2-(2-thiazolylazo)-p-cresol (tac) in micellar media of triton x-100 isproposed. the absorbance spectra were recorded in the range of 500 to 800 nm. the linear concentrationrange for nickel, cobalt and copper in solution calibration sets were 0.05–1.80, 0.10–6.41 and 0.10–6.54μg/ml, respectively. the effects of experimental parameters such as ph, time, concentration of ligand andsurfactant on the sensitivity of method were investigated. the data obtained from the experiments wereprocessed by the partial least squares (pls), orthogonal signal correction-partial least squares (osc-pls)and principle component-back propagation artificial neural network (pc-bpann). a set of syntheticmixtures of nickel, cobalt and copper was evaluated and the results obtained by each chemometricapproaches were compared with different testing methods. the osc-pls method was selected becauseafforded better results than the others. the method was satisfactorily applied for determination of nickel,cobalt and copper in alloy samples. the accuracy was determined using comparing the results to thereference values and also independent analysis by flame atomic absorption spectrometry.
منابع مشابه
Spectrophotometric simultaneous determination of nickel, cobalt and copper by orthogonal signal correction–partial least squares
A method for the simultaneous spectrophotometric determination of nickel, cobalt and copper based on theformation of their complexes with 2-(2-Thiazolylazo)-p-Cresol (TAC) in micellar media of Triton X-100 isproposed. The absorbance spectra were recorded in the range of 500 to 800 nm. The linear concentrationrange for nickel, cobalt and copper in solution calibration sets were 0.05–1.80, 0.10–6...
متن کاملSpectrophotometric simultaneous determination of nickel, cobalt and copper by orthogonal signal correction–partial least squares
A method for the simultaneous spectrophotometric determination of nickel, cobalt and copper based on the formation of their complexes with 2-(2-Thiazolylazo)-p-Cresol (TAC) in micellar media of Triton X-100 is proposed. The absorbance spectra were recorded in the range of 500 to 800 nm. The linear concentration range for nickel, cobalt and copper in solution calibration sets were 0.05–1.80, 0.1...
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متن کاملSimultaneous Spectrophotometric Determination of Iron, Cobalt and Copper by Partial Least-Squares Calibration Method in Micellar Medium
Iron, cobalt and copper are metals, which appear together in many real samples, both natural and artificial. Recently a classical univariate micellar colorimetric method has been developed for determination of these metal ions. The organized molecular assemblies such as micelles are used in spectroscopic measurements due to their possible effects on the systems of interest. The ability of mi...
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a partial least squares (pls) calibration model was developed for the simultaneous spectrophotometricdetermination of pb (ιι), cu (ιι) and ni (ιι) using xylenol orange as a chromogenic reagent. the parameterscontrolling behavior of the system were investigated and optimum conditions were selected. the calibrationgraphs were linear in the ranges of 0.0–9.091, 0.0–2.719 and 0.0–2.381 ppm for lead...
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عنوان ژورنال:
journal of the iranian chemical researchجلد ۵، شماره ۴، صفحات ۲۵۵-۲۶۳
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