Colorimetric detection and determination of Fe(III), Co(II), Cu(II) and Sn(II) in aqueous media by acrylic polymers with pendant terpyridine motifs

Abstract We have prepared Schiff base functionalized 1,2,4-Triazole and Pyrene derivatives for selective, sensitive, and naked eye colorimetric detection of Cu2+ in the mixed organic- aqueous media. Amongst the 18 different metal ions studied for absorption and fluorescence titration, only Cu2+ ion encourages the modification in spectral properties of Schiff base functionalized 1,2,4-Triazole and Pyrene Probe. The stoichiometric ratio of the Probe-Cu2+ complex was determined to be 2:1 according to Job’s plot. The lower detection limit estimated for Cu2+ is 0.234 nM which shows excellent sensitivity and selectivity of the present analytical method towards detection of Cu2+ ion in the mixed organic-aqueous media. The present approach has been successfully utilized for the quantitative determination of Cu2+ ion from environmental aqueous solution.

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Development of a sensing system based on coupling magnetic solid phase extraction and colorimetric detection for determination of organophosphorus pesticides in fruit extract and environmental sample

Sensors and Actuators B Chemical ◽

10.1016/j.snb.2021.130157 ◽

2021 ◽

pp. 130157

Author(s):

Faranak Faghiri ◽

Maryam Hajjami ◽

Farshid Ghorbani

Keyword(s):

Solid Phase Extraction ◽

Solid Phase ◽

Organophosphorus Pesticides ◽

Colorimetric Detection ◽

Magnetic Solid Phase Extraction ◽

Phase Extraction ◽

Fruit Extract ◽

Sensing System ◽

Magnetic Solid

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Immobilization of Pseudomonas aeruginosa static biomass on eggshell powder for on-line preconcentration and determination of Cr (VI)

Open Chemistry ◽

10.1515/chem-2020-0031 ◽

2020 ◽

Vol 18 (1) ◽

pp. 303-313 ◽

Cited By ~ 1

Author(s):

Aamir Rasheed ◽

Tahseen Ghous ◽

Sumaira Mumtaz ◽

Muhammad Nadeem Zafar ◽

Kalsoom Akhter ◽

...

Keyword(s):

Pseudomonas Aeruginosa ◽

Low Cost ◽

Colorimetric Detection ◽

Time Flow ◽

Highly Sensitive ◽

Glass Column ◽

On Line ◽

Preconcentration Time ◽

Ultra Trace

AbstractIn the present work, a novel continuous flow system (CFS) is developed for the preconcentration and determination of Cr (VI) using Pseudomonas aeruginosa static biomass immobilized onto an effective and low-cost solid support of powdered eggshells. A mini glass column packed with the immobilized biosorbent is incorporated in a CFS for the preconcentration and determination of Cr (VI) from aqueous solutions. The method is based on preconcentration, washing and elution steps followed by colorimetric detection with 1,5-diphenyl carbazide in sulphuric acid. The effects of several variables such as pH, retention time, flow rate, eluent concentration and loaded volume are studied. Under optimal conditions, the CFS method has a linear range between 10 and 100 μg L-1 and a detection limit of 6.25 μg L-1 for the determination of Cr (VI). The sampling frequency is 10 samples per hour with a preconcentration time of 5 mins. Furthermore, after washing with a 0.1 M buffer (pH 3.0), the activity of the biosorbent is regenerated and remained comparable for more than 200 cycles. Scanning electron microscopy reveals a successful immobilization of biomass on eggshells powder and precipitation of Cr (VI) on the bacterial cell surface. The proposed method proves highly sensitive and could be suitable for the determination of Cr (VI) at an ultra-trace level.

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Colorimetric detection of iodide ion by a nuclear fast red-based Hg2+ complex in aqueous media

Tetrahedron Letters ◽

10.1016/j.tetlet.2021.152877 ◽

2021 ◽

pp. 152877

Author(s):

Yasumasa Fukushima ◽

Shunichi Aikawa

Keyword(s):

Colorimetric Detection ◽

Aqueous Media ◽

Iodide Ion ◽

Fast Red ◽

Nuclear Fast Red

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Dissociation of imino proton(s) of a highly water-soluble metal-free phthalocyanine and determination of its pKa value in water

Journal of Porphyrins and Phthalocyanines ◽

10.1142/s1088424613500235 ◽

2013 ◽

Vol 17 (06n07) ◽

pp. 447-453 ◽

Cited By ~ 2

Author(s):

Hiroaki Isago ◽

Harumi Fujita

Keyword(s):

Aqueous Media ◽

Thermal Reaction ◽

Water Soluble ◽

Acid Dissociation ◽

Acid Dissociation Constant ◽

Metal Free ◽

Imino Proton ◽

Pka Value ◽

Triton X

Dissociation of imino proton(s) in the cavity of the macrocycle of a highly water-soluble, metal-free phthalocyanine ( H 2( H 4 tsppc ); where H 4 tsppc denotes tetrakis{(2′,6′-dimethyl-4′-sulfonic acid)phenoxy}phthalocyaninate) in ethanolic and aqueous solutions has spectrophotometrically been investigated. The spectral changes associated with reaction with NaOH have been found to involve one-proton transfer process in aqueous media while two-protons process in ethanolic media. The acid-dissociation constant of the first imino proton in water (in the presence of Triton X-100) has been determined to be 12.5 ± 0.2 (as pKa) at 25 °C. The doubly deprotonated species in EtOH has been easily converted to its corresponding cobalt(II) derivative by thermal reaction with anhydrous CoCl 2.

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A benzothiazole-based receptor for colorimetric detection of Cu2+ and S2- ions in aqueous media

Tetrahedron Letters ◽

10.1016/j.tetlet.2021.153115 ◽

2021 ◽

pp. 153115

Author(s):

Seon Min Park ◽

Sanjeev Saini ◽

Ji Eun Park ◽

Narinder Singh ◽

Doo Ok Jang

Keyword(s):

Colorimetric Detection ◽

Aqueous Media

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Selective electromembrane extraction and sensitive colorimetric detection of copper(II)

Zeitschrift für Physikalische Chemie ◽

10.1515/zpch-2020-1761 ◽

2020 ◽

Vol 0 (0) ◽

Author(s):

Wajid Ali Khan ◽

Muhammad Balal Arain ◽

Hashmat Bibi ◽

Mustafa Tuzen ◽

Nasrullah Shah ◽

...

Keyword(s):

Applied Voltage ◽

Colorimetric Detection ◽

Environmental Water ◽

Selective Extraction ◽

Effective Parameters ◽

Relative Standard ◽

Electromembrane Extraction ◽

Optimized Conditions ◽

Donor Phase

AbstractIn this study, an extremely effective electromembrane extraction (EME) method was developed for the selective extraction of Cu(II) followed by Red-Green-Blue (RGB) detection. The effective parameters optimized for the extraction efficiency of EME include applied voltage, extraction time, supported liquid membrane (SLM) composition, pH of acceptor/donor phases, and stirring rate. Under optimized conditions, Cu(II) was extracted from a 3 mL aqueous donor phase to 8 µL of 100 mM HCl acceptor solution through 1-octanol SLM using an applied voltage of 50 V for 15 min. The proposed method provides a working range of 0.1–0.75 µg·mL−1 with 0.03 µg·mL−1 limit for detection. Finally, the developed technique was applied to different environmental water samples for monitoring environmental pollution. Obtained relative recoveries were within the range of 93–106%. The relative standard deviation (RSD) and enhancement factor (EF) were found to be ≤4.8% and 100 respectively. We hope that this method can be introduced for quantitative determination of Cu(II) as a fast, simple, portable, inexpensive, effective, and precise procedure.

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