Simultaneous Spectrophotometric Determination Of Trace Amounts Of Gallium And Nickel By Benzo 15-Crown-5 And PAN Using Orthogonal Signal Correction Partial Least SquaresAuthor(s): Jahanbakhsh Ghasemi, Maziar Ahmadi Golsefidi, Hamidreza Jalilian, Golfam Ghafourifar, Rahmatollah Rajabzadeh
Orthogonal signal correction partial least squares (OSC-PLS) modeling as a powerful multivariate statistical tool applied to spectrophotometric simultaneous determination of mixtures of gallium and nickel. An ionselective bulk optode (ISBO) for sensing Ga3+ and Ni2+ ion based on plasticized poly(vinyl chloride) containing benzo-15-crown-5(B15C5) and kryptofix as ionophores and 1-(2-pyridilazo)-2-naphtol (PAN) as chromoionophore was prepared. The method is based on the formation of the complexes of PAN with gallium and nickel. The ISBO membrane shows enhanced selectivities for Ga3+ and Ni2+ but their absorption spectra of these two complexes overlap strongly, thus it is difficult to analyze the compounds in their mixtures. In this study, the calibration model is based on absorption spectra in the 400-650 nm range for 25 different mixtures of gallium and nickel. A series of synthetic solutions containing different concentrations of gallium and nickel were used to check the prediction ability of the OSC-PLS model. The RMSEP were 0.3587 and 0.8496 for gallium and nickel, respectively.