Sulfur dioxide (SO 2 ) belongs to the six major pollutants of atmospheric air [1] and ranks first in the mass of exhausts to the atmosphere. Therefore, studies on the development of methods for determining SO 2 in atmospheric air [2], including those with the use of optical chemical sensors (OCS) [3,4,5] are of high current importance.Among the sensing materials of SO 2 sensors are polycrystalline films [2], polymers with physically bound analytical reagents [4], and Langmuir-Blodgett layers [5]. Complexation reaction between SO 2 molecules and amino groups in molecules of analytical reagents is most often used as an analytical reaction. This reaction is well-known and often used for the extraction of SO 2 from waste gases [6]. In the previously developed optode [4], plasticized PVC films to which molecules of aromatic aldehydes, phenoxazine derivative as the main chromoionophore, and lipophilic alcohols were physically bound were studied as sensing materials. The reversible reaction of the bisulfite anion with aromatic aldehyde molecules followed by the detection of with an acid-base indicator was HSO 3 -HSO 3 -used as the working reaction. Analysis was performed using samples with specially controlled moisture content. The refractometric sensor based on LangmuirBlodgett layers exhibited linear calibration characteristics only in the range of rather high concentrations (500-1500 mg/m 3 ) [5].In recent years, particularly because of the rapid progress of biosensors, it has become evident that the most promising sensing materials are those in which molecules of analytical reagents or basic fragments of such molecules are chemically bound to matrix materials by covalent of ionic bonds. From the viewpoint of the stability of sensor characteristics and therefore, the practical application of OCSs, functional polymers undoubtedly offer most promise among the polymeric materials [7]. In these polymers, fragments of analytical reagents are chemically (via covalent or ionic bonds) bound to the polymer chain. In addition to the thermodynamic stability of sensing materials and the stability of sensor characteristics in time, functional polymers exhibit one more merit. This merit is the possibility of purposeful molecular design (synthesis) of materials with the specified gas-adsorption and sensing properties. It should also be noted that all the aforesaid ARTICLES Abstract-The effects of the chemical and phase composition of acrylonitrile and alkyl methacrylate (Alkyl-MA) copolymers with styrene sulfonates (SS) of triphenylmethane dye cations on the gas permeability and sensing properties of their films were studied for developing an optical chemical sensor (OCS) for sulfur dioxide (SO 2 ) on the basis of functional polymers. Of the three triphenylmethane dyes tested, namely, fuchsine, Crystal Violet, and Brilliant Green (BG), only the last dye was selected for molecular design. It was shown that the copolymer of Decyl-MA with SS-BG with the degree of modification DM = 0.10 is the best material among the studied ones from ...
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