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Sample Preparation in Quartz Crystal Microbalance Measurements of Protein Adsorption and Polymer Mechanics
Published on: January 22, 2020
The quantification of sodium in mineral waters using a quartz crystal microbalance
M Teresa S R Gomes1, J Rui M L Costa, João A B P Oliveira
1Department of Chemistry, University of Aveiro, 3810-193 Aveiro, Portugal.
Abstract:
A sensor for sodium based on a piezoelectric quartz crystal is proposed. The quartz crystal was coated with 5% of bis[(12-crown-4)methyl] dodecylmethylmalonate, 33% of PVC and 62% of NPOE to which KTpClPB in a 22% molar proportion to the ionophore was added. Coating amounts producing a frequency decrease around 18 kHz show optimum linear calibration ranges for the analysis of sodium in commercial mineral waters. Besides sensitivity, coating stability and selectivity of the sensor over other cations were adequate for those analyses. The results obtained analysing commercial mineral waters by the proposed method are not significantly different (alpha=0.05) from the ones obtained by atomic spectrometry.
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