Spectrophotometric Determination of Molybdenum(VI) as a Ternary Complex with 4-Nitrocatechol and Benzalkonium Chloride

Divarova, Vidka; Saravanska, Antoaneta D.; Toncheva, Galya K.; Milcheva, Nikolina; Delchev, Vassil B.; Gavazov, Kiril B.

doi:10.3390/molecules27041217

Cited by 4 publications

(4 citation statements)

References 44 publications

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“…Comparison of theoretical and experimental spectra of new complexes of this type is a convenient tool for clarifying their composition, structure, conformation, oxidation state of the central atom, etc. [ 37 , 38 ].…”

Section: Resultsmentioning

confidence: 99%

Vanadium-Containing Anionic Chelate for Spectrophotometric Determination of Hydroxyzine Hydrochloride in Pharmaceuticals

et al. 2023

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Four azo dyes known to form anionic complexes with V(V) were investigated as potential liquid–liquid extraction–spectrophotometric reagents for the antihistamine medication hydroxyzine hydrochloride (HZH). A stable ion-association complex suitable for analytical purposes was obtained with 6-hexyl-4-(2-thiazolylazo)resorcinol (HTAR). The molar absorption coefficient, limit of detection, linear working range, and relative standard deviation in the analysis of real pharmaceutical samples (tablets and syrup) were 3.50 × 104 L mol−1 cm−1, 0.13 μg mL−1, 0.43–12.2 μg mL−1, and ≤2.7%, respectively. After elucidating the molar ratio in the extracted ion-association complex (HZH:V = 1:1), the ground-state equilibrium geometries of the two constituent ions—HZH+ and [VO2(HTAR)]−—were optimized at the B3LYP level of theory using 6-311++G** basis functions. The cation and anion were then paired in four different ways to find the most likely structure of the extracted species. In the lowest-energy structure, the VO2 group interacts predominantly with the heterochain of the cation. A hydrogen bond is present (V–O···H–O; 1.714 Å) involving the terminal oxygen of this chain.

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Section: Resultsmentioning

confidence: 99%

Vanadium-Containing Anionic Chelate for Spectrophotometric Determination of Hydroxyzine Hydrochloride in Pharmaceuticals

et al. 2023

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“…The steel ( ca. 0.5 g) was dissolved by a known procedure [ 70 , 71 , 72 ] and collected in a 1000-mL volumetric flask. The fluoride precipitation method [ 67 ] (p. 177) was then used to remove Fe(III).…”

Section: Methodsmentioning

confidence: 99%

Use of a Hydrophobic Azo Dye for the Centrifuge-Less Cloud Point Extraction–Spectrophotometric Determination of Cobalt

et al. 2022

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The hydrophobic azo dye 6-hexyl-4-(2-thiazolylazo)resorcinol (HTAR, H2L) was studied as part of a system for the centrifuge-less cloud point extraction (CL-CPE) and spectrophotometric determination of traces of cobalt. The extracted 1:2 (Co:HTAR) complex, [CoIII(HL−)(L2−)]0, shows an absorption maximum at 553 nm and contains HTAR in two different acid–base forms. Optimum conditions for its formation and CL-CPE were found as follows: 1 × 10−5 mol L−1 of HTAR, 1.64% of Triton X-114, pH of 7.8, incubation time of 20 min at ca. 50 °C, and cooling time of 30 min at ca. −20 °C. The linear range, limit of detection, and apparent molar absorptivity coefficient were 5.4–189 ng mL−1, 1.64 ng mL−1, and 2.63 × 105 L mol−1 cm−1, respectively. The developed procedure does not use any organic solvents and can be described as simple, cheap, sensitive, convenient, and environmentally friendly. It was successfully applied to the analysis of artificial mixtures and real samples, such as steel, dental alloy, rainwater, ampoules of vitamin B12, and saline solution for intravenous infusion.

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“…3--P in the supernatant was monitored by Nessler reagent spectrophotometry [12] and molybdenum-antimony resistance spectrophotometry [14].…”

Section: Synthetic Artificial Wastewater Analysismentioning

confidence: 99%

Study the drinking water treatment residue (DWTR) based on constructed wetlands with different plants: removal performance and adsorption mechanism.

Shi

2024

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To investigate the influence of plant types on the pollution removal efficiency of drinking water treatment residue (DWTR) based constructed wetlands, a pilot-scale experiment was constructed, and the adsorption mechanisms for phosphate (PO43--P) were investigated. The results demonstrated that regardless of plant types, the DWTRs-based constructed wetlands exhibited a high removal efficiency for PO43--P, but the contribution of plants in improving the adsorption rate was relatively negligible. Additionally, the Langmuir isotherm model can describe the adsorption behaviors well, which exhibited high adsorption capabilities of 162.11 mg/g. Furthermore, the pseudo-secondorder model can describe the adsorption kinetics well, demonstrating chemical processes were the main force. This experimental study can provide theoretical guidance to enhance our understanding of the pollutant removal mechanisms in DWTRs-based constructed wetlands.

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Spectrophotometric Determination of Molybdenum(VI) as a Ternary Complex with 4-Nitrocatechol and Benzalkonium Chloride

Cited by 4 publications

References 44 publications

Vanadium-Containing Anionic Chelate for Spectrophotometric Determination of Hydroxyzine Hydrochloride in Pharmaceuticals

Vanadium-Containing Anionic Chelate for Spectrophotometric Determination of Hydroxyzine Hydrochloride in Pharmaceuticals

Use of a Hydrophobic Azo Dye for the Centrifuge-Less Cloud Point Extraction–Spectrophotometric Determination of Cobalt

Study the drinking water treatment residue (DWTR) based on constructed wetlands with different plants: removal performance and adsorption mechanism.

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