Optical sensors based on polymer films for the quantitative detection of heavy metals in mixtures and the processing of spectroscopic data using chemometric algorithms.
E. V. Yurova1,2, T. Yu. Rusanova1
1 Saratov State University, Saratov, Russia;
2 Saratov State Medical University, Saratov, Russia
Abstract
The purpose of this work was to develop a sensitive element of an optical sensor with spectrophotometric and colorimetric detection methods for determining Cu(II) in water, as well as to evaluate the possibility of chemometric methods for the separate determination of Cu(II) and Al(III) ions in the joint presence in model solutions.
Pyrocatechol violet (PV) was chosen as a photometric reagent because it forms intensely coloured complexes with a wide range of ions, particularly copper. It was found that Al (III) is an interfering ion in the determination of copper in water, since its complexes with PV absorb in the same long-wavelength region (λ = 680 nm.). To solve the problem of spectrophotometric determination of metal ions in mixtures, it is proposed to use chemometric algorithms - the method of projection on latent structures (PLS). The applicability of PLS-1 and PLS-2 methods for the separate determination of ions in mixtures containing different amounts of Cu(II) and Al(III) ions in the range of 1–90 mmol/l was evaluated.
Cellulose triacetate (TAC) films were used as a matrix for a sensitive optical sensor element. The porous structure of TAC facilitates fast responses and minimises barriers to mass transfer between the analyte and the immobilised reagent, and transparency, which is necessary in optical sensors with a spectrophotometric detection method. PV was immobilised via physical sorption. Films treated with copper sulfate solutions showed that optical density and chromaticity parameter B depend linearly on Cu(II) concentration, indicating the potential of TAC films with PV in optical sensors.
Speaker
Yurova Ekaterina
Saratov state University
Russia
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