A colorimetric probe for the real-time naked eye detection of cyanide and hydroxide ions in tap water: experimental and theoretical studies

The Analyst ◽  
2019 ◽  
Vol 144 (21) ◽  
pp. 6422-6431 ◽  
Author(s):  
Veikko Uahengo ◽  
Johannes Naimhwaka ◽  
Likius S. Daniel ◽  
Ateeq Rahman ◽  
Mohamed I. Elzagheid ◽  
...  
Keyword(s):  
Real Time ◽  
Tap Water ◽  
Reaction Process ◽  
Spectroscopic Methods ◽  
Theoretical Studies ◽  
Eye Detection ◽  
Naked Eye ◽  
One Step ◽  
Naked Eye Detection ◽  
Experimental And Theoretical Studies

Herein, a naphthyl based sensor (L) was synthesized via a one-step reaction process, and its recognition properties towards biologically important anions were investigated by naked-eye observation and spectroscopic methods.

scholarly journals A naphthoquinone based colorimetric probe for real-time naked eye detection of biologically important anions including cyanide ions in tap water: experimental and theoretical studies

RSC Advances ◽  
2019 ◽  
Vol 9 (65) ◽  
pp. 37926-37938 ◽  
Author(s):  
Johannes Naimhwaka ◽  
Veikko Uahengo
Keyword(s):  
Real Time ◽  
Tap Water ◽  
Aqueous Media ◽  
Spectroscopic Methods ◽  
Theoretical Studies ◽  
Water Mixture ◽  
Eye Detection ◽  
Naked Eye ◽  
Naked Eye Detection ◽  
Experimental And Theoretical Studies

A naphthoquinone based colorimetric sensor (N) bearing hydrazone receptors in aqueous media was developed and its recognition properties towards biologically important anions in DMSO–water mixture (9 : 1) were investigated using spectroscopic methods.

scholarly journals Correction: A colorimetric probe for the real-time naked eye detection of cyanide and hydroxide ions in tap water: experimental and theoretical studies

The Analyst ◽  
2020 ◽  
Vol 145 (1) ◽  
pp. 295-295
Author(s):  
Veikko Uahengo ◽  
Johannes Naimhwaka ◽  
Likius S. Daniel ◽  
Ateeq Rahman ◽  
Mohamed I. Elzagheid ◽  
...  
Keyword(s):  
Real Time ◽  
Tap Water ◽  
Theoretical Studies ◽  
Eye Detection ◽  
Colorimetric Probe ◽  
The Real ◽  
Naked Eye ◽  
Naked Eye Detection ◽  
Experimental And Theoretical Studies

Correction for ‘A colorimetric probe for the real-time naked eye detection of cyanide and hydroxide ions in tap water: experimental and theoretical studies’ by Veikko Uahengo et al., Analyst, 2019, 144, 6422–6431.

scholarly journals Fluorescence and Naked-Eye Detection of Pb2+ in Drinking Water Using a Low-Cost Ionophore Based Sensing Scheme

2018 ◽  
Author(s):  
Aron Hakonen ◽  
Niklas Strömberg
Keyword(s):  
Drinking Water ◽  
Tap Water ◽  
Low Cost ◽  
Consumer Products ◽  
Lead Ion ◽  
Eye Detection ◽  
Naked Eye ◽  
Highly Sensitive ◽  
Naked Eye Detection

Drinking water contamination of lead from various environmental sources, leaching consumer products and intrinsic water-pipe infrastructure is still today a matter of great concern. Therefore, new highly sensitive and convenient Pb2+ measurement schemes are necessary, especially for in-situ measurements at a low-cost. Within this work dye/ionophore/Pb2+ co-extraction and effective water phase de-colorization was utilized for highly sensitive lead measurements and sub-ppb naked-eye detection. A low-cost ionophore Benzo-18-Crown-6-ether was used, and a simple test-tube mix and separate procedure was developed. Instrumental detection limits were in the low ppt region (LOD=3, LOQ=10), and naked-eye detection was 500 ppt. Note, however, that this sensing scheme still has improvement potential as concentrations of fluorophore and ionophore were not optimized. Artificial tap-water samples, leached by a standardized method, demonstrated drinking water application. Implications for this method are convenient in-situ lead ion measurements.

Ultrasensitive visual detection of Hg2+ ions via the Tyndall effect of gold nanoparticles

2021 ◽  
Author(s):  
Zihao Deng ◽  
Wenying Jin ◽  
Qiaobo Yin ◽  
Jinkun Huang ◽  
Ziheng Huang ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Visual Detection ◽  
Eye Detection ◽  
Naked Eye ◽  
Tyndall Effect ◽  
One Step ◽  
Naked Eye Detection

This work describes a new nanosensor for one-step ultrasensitive naked-eye detection of Hg2+ ions based on the target-triggered aggregation of gold nanoparticles showing a dramatically enhanced Tyndall effect.

scholarly journals Fluorescence and Naked-Eye Detection of Pb2+ in Drinking Water Using a Low-Cost Ionophore Based Sensing Scheme

2018 ◽  
Author(s):  
Aron Hakonen ◽  
Niklas Strömberg
Keyword(s):  
Drinking Water ◽  
Tap Water ◽  
Low Cost ◽  
Consumer Products ◽  
Lead Ion ◽  
Eye Detection ◽  
Naked Eye ◽  
Highly Sensitive ◽  
Naked Eye Detection

Drinking water contamination of lead from various environmental sources, leaching consumer products and intrinsic water-pipe infrastructure is still today a matter of great concern. Therefore, new highly sensitive and convenient Pb2+ measurement schemes are necessary, especially for in-situ measurements at a low-cost. Within this work dye/ionophore/Pb2+ co-extraction and effective water phase de-colorization was utilized for highly sensitive lead measurements and sub-ppb naked-eye detection. Low-cost ionophore Benzo-18-Crown-6-ether was used, and a simple test-tube mix, shake and separate procedure was developed. Instrumental detection limits were in the low ppt region (LOD=3, LOQ=10), and naked-eye detection was 500 ppt. Note, however, that this sensing scheme still has improvement potential as concentrations of fluorophore and ionophore were not optimized. Artificial tap-water samples, leached by a standardized method, demonstrated drinking water application. Implications for this method are convenient in-situ lead ion measurements.

Synthesis of new chromogenic sensors containing thiourea and selective detection for F–, H2PO4–, and Ac– anions

2020 ◽  
Vol 98 (10) ◽  
pp. 659-666
Author(s):  
Cheng Cao ◽  
Xingmei You ◽  
Lei Feng ◽  
Guanghong Luo ◽  
Guoren Yue ◽  
...  
Keyword(s):  
Anion Recognition ◽  
High Sensitivity ◽  
Eye Detection ◽  
H Nmr ◽  
Naked Eye ◽  
Step Procedure ◽  
Colour Changes ◽  
One Step ◽  
Naked Eye Detection ◽  
C Nmr

Two new chromogenic sensors 1-(2-hydroxyphenyl)-3-(4-nitrophenyl)thiourea 1 and 1-(3-hydroxypyridin-2-yl)-3-(4-nitrophenyl)thiourea 2 bearing nitrophenyl and thiourea groups were designed and synthesized by one-step procedure and characterized through 1H NMR, 13C NMR, FTIR, and MS. The anion recognition property of the receptors was studied via naked-eye detection, UV–vis, and 1H NMR. Based on the existence of amino gen and hydroxyl moieties in receptors, receptors 1 and 2 exhibit obvious selectivity by the redshift of UV–vis signals, colour changes through naked-eye detection, and binding effects for F–, H2PO4–, and Ac–. Surprisingly, the detection limits of receptor 1 for F– and Ac– were calculated to be 5.45 × 10−7 and 2.11 × 10−7 (mol/L)−1, respectively, which indicated that F– and Ac– can be identified with high sensitivity by receptor 1. Besides, simple “test strips” were developed and were used as sensors for recognition of F–, H2PO4–, or Ac– in DMSO solution. Lastly, the mechanisms of the recognition process were studied through DFT calculation and 1H NMR titration.

scholarly journals Fluorescence and Naked-Eye Detection of Pb2+ in Drinking Water Using a Low-Cost Ionophore Based Sensing Scheme

Chemosensors ◽  
2018 ◽  
Vol 6 (4) ◽  
pp. 51 ◽  
Author(s):  
Aron Hakonen ◽  
Niklas Strömberg
Keyword(s):  
Drinking Water ◽  
Tap Water ◽  
Low Cost ◽  
Consumer Products ◽  
Lead Ion ◽  
Eye Detection ◽  
Naked Eye ◽  
Highly Sensitive ◽  
Naked Eye Detection

Drinking water contamination of lead from various environmental sources, leaching consumer products, and intrinsic water-pipe infrastructure is still today a matter of great concern. Therefore, new highly sensitive and convenient Pb2+ measurement schemes are necessary, especially for in-situ measurements at a low cost. Within this work dye/ionophore/Pb2+ co-extraction and effective water phase de-colorization was utilized for highly sensitive lead measurements and sub-ppb naked-eye detection. A low-cost ionophore Benzo-18-Crown-6-ether was used, and a simple test-tube mix and separate procedure was developed. Instrumental detection limits were in the low ppt region (LOD = 3, LOQ = 10), and naked-eye detection was 500 ppt. Note, however, that this sensing scheme still has improvement potential as concentrations of fluorophore and ionophore were not optimized. Artificial tap-water samples, leached by a standardized method, demonstrated drinking water application. Implications for this method are convenient in-situ lead ion measurements.

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