
Background. Complexity and multistage of wine technology increase risks of wine contamination by metal ions. That is why development of reliable, fast and cheap methods of toxic metals determination is actual task. The atomic absorption method possesses all above benefits; however, its sensitivity is not high enough. So, for the heave metals determination in wines on the level of maximum permissible concentration requires additional preconcentration at the probe pretreatment stage. The purpose of present work is the development of the procedure of atomic absorption determination of copper, cadmium, nickel and lead in wines through their selective preconcentration of silicas with chemically grafted iminodiacetic acid groups (SiO2-IDA) and ethylenediaminetriacetic acid (SiO2-EDTA) Methods. Sorption characteristics of chemically modified silicas for Cu (II), Cd (II), Ni (II) and Pb (II) were studied in dynamic mode, equilibrium concentrations of metal ions were determined by atomic adsorption. Results. Optimal conditions of Cu (II), Cd (II), Ni (II) and Pb (II) sorption were studied. Sorption – atomic absorption procedure of these metals quantification in aqueous solutions, was proposed. This procedure if suitable for analysis of red and white wines with satisfactory accuracy and reproducibility. Conclusions. The SiO2-IDA adsorbent appeared low efficient for metals preconcentration in dynamic conditions. The quantitative extraction of all Cu (II), Cd (II), Ni (II) and Pb (II) on SiO2-EDTA takes place at the pH = 4 – 5, while their quantitative elution can be achieved by adsorbent treatment with 1% Thio in 0.1 mol/l HCl. The optimal volume of the eluate is 2 ml for 0.1 g of adsorbent. Proposed approach was successfully applied for preconcentration and following atomic absorption determination of metal ions in red and white wines samples.
modified silica gel, концентрування, preconcentration, хімічно модифіковані кремнеземи, вино, wine, heavy metals, важкі метали
modified silica gel, концентрування, preconcentration, хімічно модифіковані кремнеземи, вино, wine, heavy metals, важкі метали
| selected citations These citations are derived from selected sources. This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically). | 0 | |
| popularity This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network. | Average | |
| influence This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically). | Average | |
| impulse This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network. | Average |
