The Impregnated Fibrous Chemisorbents for Colorimetric Detection of the Sulfur Dioxide

Khoma, R. E.; Еннан, А. А.; Bienkovska, T. S.; Dlubovskii, R. M.; Vodzinskii, S. V.; Mykhailova, Tetiana

doi:10.33609/2708-129x.88.01.2022.35-48

Cited by 3 publications

(7 citation statements)

References 15 publications

(13 reference statements)

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“…A number of authors [1][2][3][4][5][6][7] suggest equipping the GFC with an End of Service Life Indicator (ESLI), which would warn the respirator user about the need to replace the GFC; ESLIs are passive and active.…”

Section: Phisical Chemistrymentioning

confidence: 99%

“…However, the use of the above-mentioned passive ESLIs has a number of disadvantages described in [6]. To date, there is no theoretical basis for the development of indicator chemisorbents for basic gases, in particular ammonia.…”

Section: Phisical Chemistrymentioning

confidence: 99%

“…To date, there is no theoretical basis for the development of indicator chemisorbents for basic gases, in particular ammonia. Previously, we [6,10,11] used digital colorimetry in aqueous solutions and on IFCS-I surfaces to quantitatively characterize the behavior of indicator chemisorbents for acid gases. Therefore, the purpose of this work is to establish the features of the colorimetric behavior of IFCS-I during "response" by NH 3 , which will become a theoretical basis for the development of active ESLIs.…”

Section: Phisical Chemistrymentioning

confidence: 99%

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Impregnated Fibrous Chemisorbents for the Colorimetric Detection of Ammonia

2023

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The paper presents research results on the colorimetric behavior of impregnated fibrous chemisorbents (IFCS) of basic gases with visual identification of the dynamic absorption capacity “response” moment (IFCS-I) during the absorption of ammonia. Chemisorbents were obtained by impregnation of fibrous carriers with polybasic hydroxyl acid aqueous solutions with adding acid-base indicators (Ind). IFCS-I based on oxyethylenediphosphonic (IFCS-OEDPA-I), citric (IFCS-CA-I), and malic (IFCS-MA-I) acids were used. Azolithine (Az), lakmoid (LA), methyl orange (MO), methyl red (MR), Tropeolin OOO (TrOOO), Congo red (CoR), bromocresol green (BCG), broxylenol blue (BXB), bromophenol blue (BPB), bromophenol red (BPR), thymol blue (TB), xylenol orange (XO), and phenol red (PR) were used as acid-base indicators. The specificity of the changes in the colorimetric functions of IFCS-I during the absorption of NH3 by them was revealed. It was found that the color of the initial IFCS-I samples significantly depended not only on the structure of Ind, but also on the nature of the polybasic hydroxy acid being part of them. The colors of the samples based only on OEDPA (Ind = CoR, BCG, BPB), CA (Ind = CoR, TrOOO, BCG, BPB, BPR, XO) and some MA (TrOOO, BCG) are similar to the colors of aqueous solutions of Brönsted acids. The difference in the colors of the other samples from the colors of strong acid aqueous solutions with the same Ind is apparently due to specific interactions between hydroxy acid anions and neutral dye forms. During “response” to NH3 only some IFCS-I samples based on OEDPA (Ind: MO, TrOOO, Az and BPR), CA (Ind: CoR, MR, MO, TrOOO, BXB, BPR, TB, PR) and MA (Ind: LA, MR, MO, Az, BXB, XO, TB, PR) are discolored in contrast to the behavior of SO2 indicator chemisorbents.

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Section: Phisical Chemistrymentioning

confidence: 99%

Section: Phisical Chemistrymentioning

confidence: 99%

Section: Phisical Chemistrymentioning

confidence: 99%

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Impregnated Fibrous Chemisorbents for the Colorimetric Detection of Ammonia

2023

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“…З поширенням цифрової фотографії, настільних сканерів і комп'ютерних програм обробки кольорового зображення з'явився швидкий і об'єктивний спосіб оцінки колірних характеристик забарвлених зразків, що відкриває перспективу застосування кольорометрії в хімічному аналізі різних об'єктів за відсутності приладового забезпечення або з мінімальним його застосуванням [7][8]. Отриманий за допомогою цифрового фотоапарату [9], кіно-або відеокамери [10][11][12] або сканеру [13][14][15][16][17][18][19][20][21][22][23] файл зображення обробляється графічним редактором. Таким чином, процес кольорометричного аналізу розбивається на дві частини: отримання якісного цифрового зображення об'єкту, що аналізується, та обробка отриманого файлу в графічному редакторі.…”

Section: використання офісного сканеру для отримання цифрових зображе...unclassified

Office Scanner Use for Obtaining Analysis Objects Digital Images and Their Color Characteristics Computer Determination

Zheltvay¹,

Timukhin²,

Khoma³

et al. 2022

Вісник ОНУ

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Recently, the practice of analytical chemistry has included the method of chemical chromaticity, based on the measurement of the integral characteristics of the color reflected from the surface of the analyte and which makes it possible to distinguish between spectrally close substances. With the spread scanners and computer programs for color image processing, a fast and objective method for assessing the color characteristics of colored samples has appeared, opening up the prospect of using chemical chromaticity in the chemical analysis of various objects in the absence of special spectrophotometric equipment or with minimal use of it. Thus, the process of chemical chromaticity analysis is divided into two parts: obtaining a high-quality digital image of the analyzed object and processing the resulting file in a graphics editor. The article describes in detail the methodological issues of scanning solutions, powders, surfaces of dosage forms using an office scanner and processing the resulting digital images in a graphics editor. On the example of model samples, standard solutions of salts FeCl3⋅6H2O, CoCl2⋅6H2O, CuSO4⋅5H2O, it is shown that in the range of 6–60 g/l their concentrations can be determined with sufficient accuracy as with using its absorption spectra (registered on a Lambda 9 PerkinElmer spectrophotometer) or spectra of diffuse reflection (on the same instrument using a scanning sphere B013–9941), and when using an desktop scanner HP scanjet 2200c with HP PrecisionScan LTX 1.2 software, followed by digital processing of the scan in Photoshop CS3. Acquisition and analysis of digital images of analytes can be considered as an inexpensive replacement for spectrophotometry in a certain interval of concentrations, comparable with it in terms of accuracy and reliability of determinations. The introduction of this technique into the educational process makes it possible to increase the efficiency of teaching students when mastering the skills of converting color characteristics into optical density values and to better understand the principles of the science of color and light absorption. The method can be made mobile for analysis of results in remote areas using a portable scanner powered by battery.

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“…В продовження проведених нами раніше досліджень [1][2][3][4][5][6][7][8][9] щодо розробки хемосорбентів кислих газів з індикацією "спрацьовування" динамічної поглинальної ємності, у даній роботі приведені дані вивчення кислотно-основних властивостей модельних систем SO 2 -KOH -TrOOO -H 2 O та SO 2 -Am -TrOOO -H 2 O (TrOOO -тропеолін ООО; Am -діетаноламін (DEA), триетаноламін (TEA), N-метилмоноетаноламін (MMEA) та морфолін (Mf)) при 293 К за допомогою методів рН-метрії, спектрофотометрії та кольорометрії, подібно [8,9]. Методика проведення експерименту детально описана в [8].…”

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SO2 – Am (KOH) – TROPEOLIN OOO – H2O (Am – ETHANOLAMINES, MORPHOLINE) SYSTEMS ACID-BASE PROPERTIES

Khoma

Bienkovska

Bugova³

et al. 2023

Вісник ОНУ

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The study of data on acid-base properties of model systems SO2 – KOH – TrOOO – H2O and SO2 – Am – TrOOO – H2O (TrOOO – tropeoline OOO; Am – diethanolamine (DEA), triethanolamine (TEA), N‑methylmonoethanolamine (MMEA) and morpholine (Mf) at 293 K using pH-, spectrophotometry and colorimetry methods are presented. There is a pronounced isosbestic point at 415 nm in the electronic absorption spectra of the systems SO2– Am –TrOOO– H2O (Am = MMEA, MEA and TEA; pH ≤ 7.5; T = 293 K), which indicates the presence of a dynamic equilibrium between ion-molecular forms. According to the width of the absorption spectra, the bases in the region of 2.0 ≤ pH ≤ 8.0 can be arranged in the following row: MEA > Mf > KOH > DEA > TEA > MMEA. The bases can be arranged in the following rows for the effect on optical density at 490 nm: KOH > Mf ≥ MEA > DEA ≥ TEA (at 5.5 ≤ pH < 9.0); KOH = MEA = Mf > DEA = TEA (at pH < 6.0). According to the values of optical density at 360 nm in the region of 2.0 ≤ pH < 8.5, the bases can be arranged in the following row: Mf > KOH ≥ MEA ≥ DEA > MMEA > TEA. The total color difference (ΔE76) and specific color difference (SCD) values were calculated by colorimetric method as a function of pH. The acid–base dissociation constants in the SO2 – Am (KOH) – TrOOO – H2O systems significantly depend on the structure and physicochemical properties of the organic base and differ significantly from those in the HCl (HClO4, H2SO4) – MEA – TrOOO – H2O systems. The interrelation of colorimetric functions was established (total color difference and specific color difference) of SO2 – Am – TrOOO – H2O systems with molar refraction Am, empirical function pKa – lgPow, which combines the basicity and hydrophilicity of Am, formation constants of ammonium sulfites and hydrosulfites, pH- (dpH/dpQSO2), redox- (dЕ/dpQSO2) and conductometric (Dk) titration curves of Am aqueous solutions with gaseous sulfur dioxide.

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The Impregnated Fibrous Chemisorbents for Colorimetric Detection of the Sulfur Dioxide

Cited by 3 publications

References 15 publications

Impregnated Fibrous Chemisorbents for the Colorimetric Detection of Ammonia

Impregnated Fibrous Chemisorbents for the Colorimetric Detection of Ammonia

Office Scanner Use for Obtaining Analysis Objects Digital Images and Their Color Characteristics Computer Determination

SO2 – Am (KOH) – TROPEOLIN OOO – H2O (Am – ETHANOLAMINES, MORPHOLINE) SYSTEMS ACID-BASE PROPERTIES

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