Simultaneous Spectrophotometric Determination of Co2+, Ni2+ and Cu2+ in Industrial Alloys Using Partial Least Squares Method

Abstract

Spectrometric multicomponent analysis is a subject of great practical importance in the environmental, clinical, pharmaceutical and cultural heritage areas. Partial Least Squares (PLS) modeling based on SIMPLS algorithm was applied for the simultaneous spectrophotometric determination of Co(II), Ni(II) and Cu(II) with ammonium purpurate (murexide) as the complexing agent. An analytical wavelengths of (400 to 490) nm were chosen and an experimental calibration matrix for PLS was designed with 21 samples of (0.354 to 5.893) g/mL, (0.352 to 5.869) g/mL and (0.381 to 6.355) g/mL for cobalt, nickel and copper, respectively. A leave one out cross-validation procedure was used for selecting the number of components using PRESS. The method was successfully applied to the simultaneous determination of these metals in industrial alloys.

Independent component analysis algorithms for spectral decomposition in UV/VIS analysis of metal-containing mixtures including multimineral food supplements and platinum concentrates

“…This includes Chrome Azurol S for determination of Fe(III) and Al(III), 44,51 salicyluorone (SAF) for Al(III), Mn(II) and Co(II), 52 morin for Fe(III), Al(III) and V(V) 53 or ammonium purpurate (murexide) for Co(II), Ni(II) and Cu(II). 54 However, the number of analyzed metals is restricted to two-three ions in all cases. We believe that PAR and EDTA are better suited as chromotropic derivatization reagents in chemometric analysis because they react with many metal ions and, therefore, truly multicomponent analysis (up to 5 metals) can be achieved.…”

Two novel colorimetric probes (5-HMBA-FH and 3-HMBA-FH) based on fluorescein for copper(II) ion detection

“…Previously, the numerous types of techniques adopted for Cu 2+ ion measurement included atomic absorption spectrometry 9,10 , chemiluminescence, ICP-OES and spectrophotometric methods [11][12][13][14] . Thereinto, the spectrophotometric method combined with colorimetric probes or fluorescent probes, in terms of fast screening, simple operation, high precision and amenability towards visual inspection, have attracted considerable attentions to detect heavy metal ions in water.…”

Simultaneous ultraviolet-visible (UVVIS) spectrophotometric quantitative determination of Pb, Hg, Cd, As and Ni ions in aqueous solutions using cyanidin as a chromogenic reagent

“…The problems associated with spectroscopic determination of these trace heavy metals are complicated by the nature of the photochromic or chromogenic ligands which are mainly synthetic and are toxic in the environment. Some of the reported simultaneous determination of metals using UV spectrophotometry were carried out using toxic and expensive reagent (Rouhollahi et al, 2007;Kachbi, 2010;Naguraja et al, 2009). Other works in literature use specific ligands for specific metals at even different pH values for multi-elements determinations.…”