scholarly journals New Polymerizable Tetraaza Macrocycle Containing Two Acridine Units for Selective Fluorescence Sensing of Metal Ions

2021 ◽  
Author(s):  
Ádám Golcs ◽  
Korinna Kovács ◽  
Panna Vezse ◽  
Péter Huszthy ◽  
Tünde Tóth
Keyword(s):  
Metal Ions ◽  
Biological Samples ◽  
Metal Ion ◽  
Tetraaza Macrocycle ◽  
Fluorescence Sensing ◽  
Ion Recognition ◽  
Thermodynamic Constants ◽  
Recognition Ability ◽  
Immobilized Ionophores

AbstractA new fluorescent bis(acridino)-macrocycle containing two allyl groups was synthesized and photophysically studied. Studies were carried out on metal ion recognition and selectivity-influencing effects including the determination of the relevant thermodynamic constants as logK and pKa. The proposed sensor molecule is recommended for the development of Zn2+-selective optochemical analyzers based on covalently immobilized ionophores as it has a unique pH-independent metal ion recognition ability, which is not influenced by anions and other potentially occurring metal ions in biological samples.

scholarly journals Spectrophotometric Method for Determination of Paraquat in Food and Biological Samples

1997 ◽  
Vol 80 (2) ◽  
pp. 388-391 ◽  
Author(s):  
Ritu Kesari ◽  
Manish Rai ◽  
Vinay Kumar Gupta
Keyword(s):  
Standard Deviation ◽  
Metal Ions ◽  
Relative Standard Deviation ◽  
Alkaline Medium ◽  
Spectrophotometric Method ◽  
Biological Samples ◽  
Molar Absorptivity ◽  
Relative Standard ◽  
Sensitive Spectrophotometric Method

Abstract A sensitive spectrophotometric method was developed for determination of paraquat, a widely used herbicide. Paraquat was reduced with glucose in an alkaline medium, and the blue radical ion obtained was measured at 600 nm. Beer’s law was obeyed at 0.1–1.2 ppm paraquat. The molar absorptivity was 1.26 × 105 L mol-1 cm-1. The standard deviation and relative standard deviation were ± 0.007 and 2.0%, respectively, for 5 μg paraquat/10 mL analyzed over 7 days. The method was free from interference by other commonly used pesticides and metal ions. The method may be used to the determine paraquat in plants, fruits, grains, water, blood, and urine.

A novel fluorescent probe based on biphenyl and rhodamine for multi-metal ion recognition and its application

2018 ◽  
Vol 47 (10) ◽  
pp. 3378-3387 ◽  
Author(s):  
Xu Tang ◽  
Yun Wang ◽  
Juan Han ◽  
Liang Ni ◽  
Huiqin Zhang ◽  
...  
Keyword(s):  
Metal Ions ◽  
Fluorescent Probe ◽  
Metal Ion ◽  
Ion Recognition

A novel fluorescent probe for the detection of multi metal ions was designed and synthesized based on the fluorophores of biphenyl and rhodamine.

Report Paper 4: Determination of Bonds between Metal Ions and Additives by Means of Surface Pressure and Infrared Spectra

1969 ◽  
Vol 184 (12) ◽  
pp. 201-206
Author(s):  
S. Friberg ◽  
H. Müller
Keyword(s):  
Aqueous Solution ◽  
Metal Ions ◽  
Infrared Spectra ◽  
Surface Pressure ◽  
Metal Ion ◽  
Specific Information ◽  
Bond Properties ◽  
Monomolecular Layers ◽  
Surface Balance

A surface balance of the Langmuir type was used to determine the effect of different metal ion specia in an aqueous solution on the surface pressure of monomolecular layers of additives. To gain more specific information about the bond properties, the monolayers were collected and the infrared spectra recorded. It is suggested that the results can be used as data when the bonds between the additives and the atom groups on a metal surface are being considered.

Theoretical Considerations and Equilibrium Conditions in Analytical Potentiometry. Computer Facilitated Mathematical Analysis of Equilibria in a Multicomponent System

1973 ◽  
Vol 51 (21) ◽  
pp. 3541-3548 ◽  
Author(s):  
Bihudhendra Sarkar ◽  
Theo P. A. Kruck
Keyword(s):  
Metal Ions ◽  
Mathematical Analysis ◽  
Metal Ion ◽  
Binary Systems ◽  
Accurate Determination ◽  
Multicomponent System ◽  
Glass Electrode ◽  
Complex Species ◽  
Ligand Coordination

A method entitled "analytical potentiometry" is described which permits the accurate determination of the stability constants and of the distribution of simultaneously existing complex species in multi-component systems. A series of computer programs are introduced to facilitate the otherwise tedious mathematical analysis of data. Besides simple binary systems, this method is capable of dealing with mixed ligand coordination complexes and can be adapted to polynuclear systems. For many metal ions, there are no electrodes permitting the accurate determination of those ions over a wide enough concentration range. This method eliminates the need for metal ion specific electrodes. The concentration of free metal ions is determined indirectly by the use of a weak base and the glass electrode. These features bear great significance in resolving complex systems containing multiple species simultaneously which cannot be solved by the commonly known classical methods.

scholarly journals Fabrication of novel polymer-modified graphene-based electrochemical sensor for the determination of mercury and lead ions in water and biological samples

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Chenthattil Raril ◽  
Jamballi G. Manjunatha
Keyword(s):  
Heavy Metal ◽  
Detection Limit ◽  
Metal Ions ◽  
Biological Samples ◽  
Heavy Metal Ions ◽  
Electrochemical Techniques ◽  
Differential Pulse ◽  
Modified Graphene ◽  
Water And Biological Samples

Abstract Background This paper presents the application of polyglycine-modified graphene paste electrode (PGMGPE) for the electrochemical detection of Hg (II) and Pb (II) ions in the water and biological samples. Method The developed electrode was characterized by field emission scanning electron microscopy. Electrochemical techniques such as cyclic voltammetry and differential pulse voltammetry were used to study the behavior of metal ions. Results The modification process improves the electrochemical behavior of heavy metal ions. The peak current varied linearly with the increase of the concentration leading to a detection limit of 6.6 μM (Hg (II)) and 0.8 μM (Pb (II)), respectively. Conclusion The developed electrode exhibits good sensitivity, selectivity, stability, and lower detection limit, and was successfully applied to the determination of heavy metal ions in water and biological samples with a good recovery range.

Sign in / Sign up

Export Citation Format

Share Document