Ultrasensitive catalytic assessment of chromium(VI) using digital imaging

Mohamed, Ashraf A.; Ismail, Ethar M.; Ali, Samah

doi:10.1016/j.microc.2020.105054

Cited by 5 publications

(3 citation statements)

References 30 publications

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“…Digital Image Based Analysis (DIBA) measurements was performed using a traditional IXUS 185 Canon digital camera mounted in our formerly reported and validated homemade platform (26)(27)(28) . In brief, the platform consisted of (1) the digital camera as the sensor (2) two 10 mm path-length glass cells and (3) a white paper as a diffuser.…”

Section: Materials and Methods 1 Instruments And Softwarementioning

confidence: 99%

A novel highly sensitive catalytic determination of selenium using a digital camera

Ragheb

Ali²,

Mohamed³

et al. 2022

International Journal of Development

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Simple, lower-cost, selective and highly sensitive methods for the assessment of Selenium (IV) as a critical environmental pollutant are highly desirable, especially under resource limited settings. Therefore, herein we describe the coupling of digital imaging with catalytic analysis for the extremely sensitive determination of Se(IV) using its catalytic effect on the micellar sensitized Methylene blue (MB)hydrosulfide reduction reaction. The initial rate kinetic measurement was applied by following the decolorization of MB within 60 sec of mixing the reactants using a digital camera or spectrophotometrically at 665 nm. The optimum reaction conditions were: 9.0 mol L -1 MB, 10.0 mmol L -1 Na 2 S, 6.3 mmol L -1 Na 2 SO 3 , 8.0 mmol L -1 CTAB, 90.0 mmol L -1 borax, 0.15 v/v% HCHO, 30.0 mmol L -1 of EDTA, 3.0 v/v% triethanolamine, at pH = 9.30±0.10 and 30C. The calibration graphs fitted second order polynomial equations for up to 19.0 and 20.0 ng mL -1 Se(IV) with a detection limit (3S b ) of 0.2 and 0.5 ng mL -1 Se(IV), for the spectrophotometric and digital imaging monitoring respectively. The amended methods were successfully applied to various natural waters and bird feed samples. The analytical data were statistically in excellent agreement with those obtained following the official AOAC 996.16 method.

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Section: Materials and Methods 1 Instruments And Softwarementioning

confidence: 99%

A novel highly sensitive catalytic determination of selenium using a digital camera

Ragheb

Ali²,

Mohamed³

et al. 2022

International Journal of Development

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“…Sorption experiments were also undertaken in simulated water at the same experimental conditions as described above for Cr aqueous solutions. Although many researchers have reported the effects of possible interfering species (e.g., Fe(III), Mn(II), Na(I), K(I), Cl -, SO 4 2− , NO 3 -) to chromium (VI) in natural and polluted wastewaters, the simulated natural water, used in this work, contained the common interfering ions and was freshly prepared according to the National Sanitation Foundation (NSF) protocols (Table S1) [Jiang et al, 2019;Mohamed et al, 2020].…”

Section: Sorption Studymentioning

confidence: 99%

“…Chromium (III) is an essential micronutrient, and its deficiency may lead to diabetic syndromes, while chromium (VI) is highly toxic and carcinogenic for humans. According to WHO guidelines for drinking water quality, the guideline value of 50 µg/L is proposed for total chromium [Acharya et al, 2021;Mohamed et al, 2020].…”

Section: Introductionmentioning

confidence: 99%

Critical Parameters and Mechanisms of Chromium Removal from Water by Copper-Based Nanoparticles

Noli

Dafnomili

Dendrinou‐Samara

et al. 2022

Water Air Soil Pollut

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This research aims to explore the chromium removal from water using copper-based nanoparticles. The nanoparticles were synthesized by hydrothermal method and characterized by X-ray diffraction, scanning electron microscopy, infrared spectroscopy, and X-ray photoelectron spectroscopy as well as determination of the specific surface area (SBET) and point of zero charge (PZC). The size and composition of nanoparticles are influenced by the reaction time, organic coating, and oxidizing atmosphere. Sorption experiments were carried out in aqueous solutions as well as simulated drinking water at various initial concentration, time, and temperature. Cu nanoparticles had a significant Cr uptake capacity of 3.4 mg·g−1 for Cin 1.0 mg·L−1 lowering the Cr concentration below the provisional guideline value of 50 μg·L−1. Sorption isotherms were fitted to Henry, Langmuir, and Freundlich models, whereas kinetic data were reproduced by different kinetic models. Iodide sorption experiments were carried out to explore the sorption mechanism onto Cu-NPs. Considering the biocompatibility, stability, good uptake capacity, and reusability, Cu nanoparticles could be considered as promising agents for applications in water purification.

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Investigation of the toxicity of Cr (VI) against cyanobacteria and the mechanism of tolerance of the cyanobacterial consortia: a quantum mechanical approach

Sharma,

Maurya,

Sundaram

2024

Environ Sci Pollut Res

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Ultrasensitive catalytic assessment of chromium(VI) using digital imaging

Cited by 5 publications

References 30 publications

A novel highly sensitive catalytic determination of selenium using a digital camera

A novel highly sensitive catalytic determination of selenium using a digital camera

Critical Parameters and Mechanisms of Chromium Removal from Water by Copper-Based Nanoparticles

Investigation of the toxicity of Cr (VI) against cyanobacteria and the mechanism of tolerance of the cyanobacterial consortia: a quantum mechanical approach

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