Digital colorimetric determination of chlorides in water using gas extraction and methyl orange

Gorbunova, M. O.; Bayan, Е. М.; Shevchenko, A. V.; Kulyaginova, Margarita S.

doi:10.15826/analitika.2017.21.3.007

Cited by 3 publications

(1 citation statement)

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“…The most commonly used indicator forms are tablets, thin films, and reagents deposited on cellulose carriers, such as paper test strips [ 12 , 13 , 14 ]. The interaction of the analyte with the reagent manifests itself in a change in color due to the formation of a colored compound [ 15 , 16 , 17 ] or bleaching of the dye [ 18 , 19 , 20 ], and also leads to a change in the spectral properties of nanoparticles [ 21 , 22 , 23 , 24 ]. In other words, solid-phase analytical reagents represent a specific class of chemosensors.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Reactive Indicator Papers Based on Silver-Containing Nanocomposites for the Analysis of Chloride Ions

Gorbunova,

Uflyand,

Zhinzhilo

et al. 2023

Micromachines

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In recent decades, metal-containing nanocomposites have attracted considerable attention from researchers. In this work, for the first time, a detailed analysis of the preparation of reactive indicator papers (RIPs) based on silver-containing nanocomposites derived from silver fumarate was carried out. Thermolysis products are silver-containing nanocomposites containing silver nanoparticles uniformly distributed in a stabilizing carbon matrix. The study of the optical properties of silver-containing nanocomposites made it possible to outline the prospects for their application in chemical analysis. RIPs were made by impregnating a cellulose carrier with synthesized silver fumarate-derived nanocomposites, which change their color when interacting with chlorine vapor. This made it possible to propose a method for the determination of chloride ions with preliminary oxidation to molecular chlorine, which is then separated from the solution by gas extraction. The subsequent detection of the active zone of RIPs using colorimetry makes it possible to identify mathematical dependences of color coordinates on the concentration of chloride ions. The red (R) color coordinate in the RGB (red-green-blue) system was chosen as the most sensitive and promising analytical signal. Calibration plots of exponential and linear form and their equations are presented. The limit of detection is 0.036 mg/L, the limits of quantification are 0.15–2.4 mg/L, and the time of a single determination is 25 min. The prospects of the developed technique have been successfully shown in the example of the analysis of the natural waters of the Don River, pharmaceuticals, and food products.

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Section: Introductionmentioning

confidence: 99%

Preparation of Reactive Indicator Papers Based on Silver-Containing Nanocomposites for the Analysis of Chloride Ions

Gorbunova,

Uflyand,

Zhinzhilo

et al. 2023

Micromachines

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Optimization of Synthesis of Nanosized Titanium Dioxide Powder Materials from Peroxo Titanium Complex

Bayan

Лупейко

Pustovaya

2019

Russ. J. Phys. Chem. B

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Nanocomposites of Copper Trimesinate and Graphene Oxide as Sorbents for the Solid-Phase Extraction of Organic Dyes

2022

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A nanocomposite based on graphene oxide and copper trimesinate was obtained by the in situ method. The samples have permanent porosity and a microporous structure with a large surface area corresponding to the adsorption type I. A study of the adsorption properties of the obtained composites with respect to organic dyes (malachite green, indigo carmine, brilliant green, Rose Bengal, crystal violet) showed that adsorption largely depends on the content of graphene oxide in the composites. The complex is an effective sorbent for the extraction of cationic and neutral organic dyes when the content of graphene oxide in the nanocomposite is 20% of the calculated copper trimesinate due to electrostatic forces of interaction. For anionic dyes, the maximum adsorption is achieved when using a composite containing 5% graphene oxide due to the predominance of physical sorption. Experimental results show that the obtained sorbent can be used for extraction in a wide pH range, illustrating the excellent pH window offered by this adsorbent. Kinetics data were properly fitted with the pseudo-second-order model. Equilibrium data were best correlated with the Freundlich model. The process was endothermic and spontaneous in nature. The composite makes it possible to achieve a maximum sorption of 393 mg/g, which is a sufficiently high value for the absorption of dyes.

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Digital colorimetric determination of chlorides in water using gas extraction and methyl orange

Cited by 3 publications

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Preparation of Reactive Indicator Papers Based on Silver-Containing Nanocomposites for the Analysis of Chloride Ions

Preparation of Reactive Indicator Papers Based on Silver-Containing Nanocomposites for the Analysis of Chloride Ions

Optimization of Synthesis of Nanosized Titanium Dioxide Powder Materials from Peroxo Titanium Complex

Nanocomposites of Copper Trimesinate and Graphene Oxide as Sorbents for the Solid-Phase Extraction of Organic Dyes

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