Standardized and unified methods for determining phenols in natural and drinking waters and main trends of their development

Воробьева, Т. В.; Terletskaya, A. V.; Kushchevskaya, N. F.

doi:10.3103/s1063455x07040030

Cited by 9 publications

(3 citation statements)

References 26 publications

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“…Phenol concentrations were determined using a calibration graph using the optical densities of the solution at a phenol absorption wavelength of 270 nm. In the UV spectra, the absorption bands of phenol are as follows: 210 (ε = 6200 L/mol•cm) and 270 nm (ε = 1450 L/mol•cm) [49][50][51][52][53][54][55][56][57]. The dependence of optical density on phenol concentration obeys the Bouguer-Lambert-Beer law in the plateau region at 270-280 nm.…”

Section: Methodsmentioning

confidence: 96%

Catalysts Based on Nanoscale Iron and Cobalt Immobilized on Polymers for Catalytic Oxidation of Aromatic Hydrocarbons: Synthesis, Physico-Chemical Studies, and Tests of Catalytic Activity

Dossumova,

Sassykova,

Shakiyeva

et al. 2023

Processes

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It is known that highly efficient catalysts for the catalytic oxidation of aromatic hydrocarbons can be obtained based on magnetic nanoparticles. The development of nanosized magnetically controlled catalysts for the oxidation of aromatic hydrocarbons with oxygen deserves especially close attention in the territory of the Republic of Kazakhstan, which does not have its own industrial production of oxygen-containing compounds. The aim of this work is to create catalysts based on Fe and Co nanoparticles stabilized with polymers: polyvinylpyrrolidone, chitosan, and polyethylenimine, study them by methods of physico-chemical research, and conduct preliminary tests of catalysts to predict their effectiveness. Magnetic nanoparticles were prepared by the co-precipitation method. Based on the results of the SEM analysis, it was concluded that polymers form composites together with metal nanocrystals. According to preliminary data, the most efficient oxidation of phenol in a non-flowing glass gradient-free thermostated duck-type reactor occurs on Fe3O4/chitosan, with the phenol conversion being 55–60%. Tests on the oxidation of phenol with oxygen showed a favorable prognosis for the use of such catalysts for the oxidative conversion of aromatic hydrocarbons in order to obtain valuable intermediates.

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Section: Methodsmentioning

confidence: 96%

Catalysts Based on Nanoscale Iron and Cobalt Immobilized on Polymers for Catalytic Oxidation of Aromatic Hydrocarbons: Synthesis, Physico-Chemical Studies, and Tests of Catalytic Activity

Dossumova,

Sassykova,

Shakiyeva

et al. 2023

Processes

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“…The comparative data presented in Table 2 reveal that the proposed sensor is more sensitive than reported in the literature. Taking into account that the maximum admissible concentration of 2.4-dichlorophenol in drinking water is 0.3-40 μg L À 1 (1.84 nmol L À 1 -0.25 μmol L À 1 ) [49], its detection limit (LOD) was considered as satisfactory. Moreover, the sensor presents some important advantages such as stability, low cost, simple fabrication and surface renewal procedure.…”

Section: Accumulation Time Optimizationmentioning

confidence: 99%

Adsorptive Stripping Voltammetric Determination of 2,4‐Dichlorophenol by Laponite Modified Carbon Paste Electrode

et al. 2020

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A laponite modified carbon paste electrode was prepared, characterized and applied for the 2,4‐dichlorophenol (2,4‐DCP) voltammetric determination. It takes advantage of the ability of laponite to adsorb phenols, as well as of its availability and very low cost. Kinetic and equilibrium data for 2,4‐DCP adsorption by laponite in aqueous dispersions demonstrated that the adsorption process obeyed a pseudo first order kinetic model and was consistent with the formation of adsorbed multilayers on a surface with heterogeneous pore distribution. The composite paste electrode exhibited a heterogeneous surface with 65 % increased surface area and 27 % enhanced catalytic activity compared to the unmodified one. The adsorptive stripping voltammetric determination of 2,4‐DCP at an electrode with an optimized graphite:laponite ratio of 55 : 15 w% using a 3 min accumulation time at pH 5.5 was found to be suitable for its quantification in the linear concentration range extended up to 50 μmol L−1 with a sensitivity of 0.56 μA L μmol−1 and a LOD of 0.2 μmol L−1 (S/N=3).The 2,4‐DCP electrochemical response was not affected by the presence of some structurally similar phenols, like catechol and p‐nitrophenol, while resorcinol, 2‐chlorophenol, and 4‐chlorophenol presented interferences. The results were validated by 2,4‐DCP determination in spiked tap water.

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“…For the majority of phenols the maximum permissible concentrations (MPCs) are set at a level of n µg/L [1], so for their determination one should use preconcentration procedures, the most widespread of which are liquid-liquid extraction and sorption pre concentration (solid phase extraction, SPE) [2][3][4][5][6]. The SPE method is experimentally less complicated, takes less time, and reduces the loss of samples and the expenditure of costly and highly toxic solvents.…”

mentioning

confidence: 99%

Optimization of the conditions of phenol determination in natural and potable waters by HPLC with sorption preconcentration

2014

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The conditions of the sorption preconcentration of phenols from samples of natural and potable waters in Diapak P concentrator cartridges filled with super cross linked polystyrene are optimized. Coun tercurrent desorption with acetonitrile or methanol ensures the elimination the step of organic solvent evap oration. The observed reduction of the sorption of humic and fulvic acids (HFA) on the addition of sodium sulfite to the samples of natural and potable waters prior to their processing probably relates to the change of pH. The preconcentration of phenols from natural and potable waters at pH 6-8 substantially reduces the sorption of HFA. The method is used to determine phenols in samples of tap water and water from the Yenisei river by the added-found method.

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Standardized and unified methods for determining phenols in natural and drinking waters and main trends of their development

Cited by 9 publications

References 26 publications

Catalysts Based on Nanoscale Iron and Cobalt Immobilized on Polymers for Catalytic Oxidation of Aromatic Hydrocarbons: Synthesis, Physico-Chemical Studies, and Tests of Catalytic Activity

Catalysts Based on Nanoscale Iron and Cobalt Immobilized on Polymers for Catalytic Oxidation of Aromatic Hydrocarbons: Synthesis, Physico-Chemical Studies, and Tests of Catalytic Activity

Adsorptive Stripping Voltammetric Determination of 2,4‐Dichlorophenol by Laponite Modified Carbon Paste Electrode

Optimization of the conditions of phenol determination in natural and potable waters by HPLC with sorption preconcentration

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