Kanberoglu, Gulsah Saydan; Kaya, Nurcan; Coldur, Fatih; Hashemi-Moghaddam, Hamid; Soylak, Mustafa

A rhodamine B (RH-B)-imprinted functional polymer was synthesized by free radical polymerization, utilizing RH-B as the template, methacrylic acid as the functional monomer, and ethyleneglycol dimethylacrylate as the cross-linker. The synthesized RH-B-imprinted polymer was characterized by FT-IR measurements. A novel RH-B-selective potentiometric poly(vinyl chloride) (PVC) membrane sensor was fabricated using this newly synthesized RH-B-imprinted functional polymer as the ionophore. Membrane optimization studies revealed that the most satisfactory membrane composition, yielding the best potentiometric parameters, comprised 32.0% (w/w) PVC, 64.0% (w/w) dibutyl phthalate, 3.0% (w/w) RH-B-imprinted polymer, and 1.0% (w/w) potassium tetrakis(4-chlorophenyl)borate. Further investigations into the potentiometric performance characteristics of the optimum composition demonstrated that the sensor exhibited a linear response to RH-B within the concentration range of 1.0 × 10–7 to 1.0 × 10–2 M with a detection limit of 1.0 × 10–8 M and a near Nernstian slope of 67.37 mV/decade. The sensor’s analytical proficiency was evidenced by its precise quantification of RH-B in RH-B-spiked rose-water samples, resulting in satisfactory recovery rates.

Dogan, Bilge; Coldur, Fatih; Caglar, Bulent; Ozdemir, Agah Oktay; Guner, Eda Keles; Ozdokur, Kemal Volkan

A novel 8-aminoquinoline-functionalized bentonite was utilized as an electroactive sensing element in the construction of a potentiometric carboxylated-PVC-based polymeric membrane electrode. The electrode exhibited a linear response for copper(II) ions in the concentration range of 1.0 × 10–5−1.0 × 10–2 mol/dm3 with a slope of 28.24 mV/decade. While the response time of the electrode determined as about 20 s, its detection limit and long life time was determined as 5.0 × 10–6 mol/dm3 and 5 months, respectively. The proposed electrode was applied for the potentiometric detection of Cu(II) contents of some spiked water samples and satisfied results were attained. Graphical abstract: [Figure not available: see fulltext.]