In Situ Synthesis of Metal Nanoparticles and Selective Naked-Eye Detection of Lead Ions from Aqueous Media

2007 ◽  
Vol 111 (34) ◽  
pp. 12839-12847 ◽  
Author(s):  
Karuvath Yoosaf ◽  
Binil Itty Ipe ◽  
Cherumuttathu H. Suresh ◽  
K. George Thomas
Keyword(s):  
Metal Nanoparticles ◽  
Aqueous Media ◽  
In Situ Synthesis ◽  
Lead Ions ◽  
Eye Detection ◽  
Naked Eye ◽  
Naked Eye Detection

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.

Anthracene labeled poly(pyridine methacrylamide) as a polymer-based chemosensor for detection of pyrophosphate (P2O74−) in semi-aqueous media

2020 ◽  
Vol 12 (47) ◽  
pp. 5699-5708
Author(s):  
Saswati Ghosh Roy ◽  
Subhendu Mondal ◽  
Kumaresh Ghosh
Keyword(s):  
Detection Limit ◽  
Aqueous Media ◽  
Eye Detection ◽  
Fluorescence Sensing ◽  
Anion Sensing ◽  
Aqueous Dmso ◽  
Naked Eye ◽  
Displacement Assay ◽  
Naked Eye Detection

Two polymers, linear P1 and cross-linked P2, are employed in anion sensing. P1 exhibits fluorescence sensing of HPPi with a detection limit of about 1.63 ppm in aqueous DMSO. P2 exhibits selective naked-eye detection of PPi/HPPi via an indicator displacement assay (IDA).

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