A novel barium polymeric membrane sensor for selective determination of barium and sulphate ions based on the complex ion associate barium(II)–Rose Bengal as neutral ionophore

Polymeric Composite Materials for the Detection of Barium Ions in Aqueous Solutions

The design of polymeric composite materials (PCM) for the optical control of chemical substances is currently one of the actively developing fields of science “at the junction” of polymer, organic, and analytical chemistry. The purpose of this work is the preparation of PCM containing derivatives of crown ethers for the optical determination of barium ions. The polymeric composite materials containing a novel optical molecular sensor have been obtained and investigated on the basis of a number of film-forming polymers. The best results have been obtained for PCM based on polyvinyl butyral films (since the fluorescence and absorption maxima shifted by 9 and 16 nm, respectively) in the fluorescence and absorption spectra of this PCM in the presence of barium ions. This makes the proposed PCM highly promising as sensor elements for the detection of the barium ions in the aqueous solutions.

A novel zinc(ii) and hydrogen sulphate selective fluorescent “turn-on” chemosensor based on isonicotiamide: INHIBIT type's logic gate and application in cancer cell imaging

We have developed a novel isonicotiamide-based fluorescent “turn-on” chemosensor 1 for the selective detection of Zn²⁺ and HSO₄⁻.

Barium concentrations and speciation in mineral natural waters of central Romania

This paper reports the results obtained for the determination of Ba concentrations in mineral groundwater samples collected from drilled outlets located in the counties of Covasna and Harghita (34 sampling points), in five expeditions (spring, summer, and autumn), during 3 years: 2005, 2006, and 2007. The experimental data show that there are some sampling sites in which the barium concentration exceeds 1 mg/L, which is the maximum concentration admitted for barium. These mineral natural waters could be used only for therapeutic purposes. All other analyzed natural mineral waters are proper as both drinking and therapeutic water. By means of a principal component analysis a statistical approach was performed, using the data obtained during those analyzing processes. The distribution of the water saturation indexes with respect to a series of mineral species (alstonite, barite, barytocalcite, nitrobarite, sanbornite, and witherite) suggests that barium tends to remain in solution as ionic species in different concentrations and to be further carried away as such.