Acid–base and coordination properties of 2-phenyl-3-hydroxy-4-quinolones in aqueous media

RSC Advances ◽  
2015 ◽  
Vol 5 (76) ◽  
pp. 62116-62127 ◽  
Author(s):  
Arturo Jiménez-Sánchez ◽  
Anatoly K. Yatsimirsky
Keyword(s):  
Metal Ions ◽  
Aqueous Media ◽  
Acid Base ◽  
Fluorescence Response ◽  
Coordination Properties

2-Phenyl-3-hydroxy-4-quinolones bind metal ions with selective fluorescence response in aqueous media.

PREDICTIVE SIMULATION AND OPTIMIZATION ORIENTED MODELING FOR THE EXTRACTION OF METAL IONS FROM SOLUTIONS INTO A NOVEL BIS-SCHIFF BASE

2019 ◽  
pp. 1-8
Author(s):  
F. S. Nworie ◽  
S. O. Ngele ◽  
J. C. Onah
Keyword(s):  
Metal Ions ◽  
Metal Concentration ◽  
Acid Concentration ◽  
Aqueous Media ◽  
Industrial Effluents ◽  
Ligand Concentration ◽  
Simulation And Optimization ◽  
Chemometric Technique ◽  
Model Equations ◽  
Level Of Significance

Metal ions present in waste samples, industrial effluents, acid mines and other aqueous media constitute a serious challenge in different human activities. Solvent extraction a technique for preconcentration, separation and identification of trace amount of metal ions coupled with multivariate chemometric technique was used for the determination of Fe(II) and Cr(III) from solutions in the presence of bis(salicylidene)ethylenediamine (SALEN). The influence of main extraction variables affecting the extraction efficiency was simultaneously studied and regression model equations illustrating the relationship between variables predicted. The extraction parameters (time of extraction, acid concentration, ligand concentration, temperature and metal concentration) were optimized using experimental designs with the contributions of the various parameters to extraction of the metal ions bound to the complexone evaluated using SPSS19.0 software. The statistically determined simulated models for the parameters were R2 = 0.946, 0.727, 0.793, 0.53, 0.53, 1.000 and F- values of 70.400, 13. 285, 15.348, 4.646 and 2.569×105 respectively for time of extraction, acid concentration, ligand concentration, temperature and metal concentration for Cr (III). For Fe (II), R2 = 0.243, 0.371, 0.519, 0.446, 1.000 and F-values of 0.964, 2.953, 4.310, 3.216 and 2.516×105 for time of extraction, acid concentration, ligand concentration, temperature and metal concentration respectively. The level of significance of the models as predicted was both lower than 5% making it feasible, efficient, reproducible and accurate. This means that metal ions at the conditions stated could be removed from waste samples, industrial effluents, acid mines and other aqueous media with extension in industrial scale application.

A single colorimetric sensor for multiple target ions: the simultaneous detection of Fe2+ and Cu2+ in aqueous media

RSC Advances ◽  
2014 ◽  
Vol 4 (43) ◽  
pp. 22463-22469 ◽  
Author(s):  
Hyun Kim ◽  
Yu Jeong Na ◽  
Eun Joo Song ◽  
Kyung Beom Kim ◽  
Jeong Mi Bae ◽  
...  
Keyword(s):  
Metal Ions ◽  
Aqueous Media ◽  
Simultaneous Detection ◽  
Colorimetric Sensor ◽  
Multiple Target ◽  
Novel Approach

The receptor 1 provides a novel approach for the simultaneous colorimetric recognition of two metal ions Fe2+ and Cu2+.

scholarly journals Interactions of atrazine with transition metal ions in aqueous media: experimental and computational approach

3 Biotech ◽  
2015 ◽  
Vol 5 (5) ◽  
pp. 791-798 ◽  
Author(s):  
Vijay Kumar ◽  
Virender Kumar ◽  
Niraj Upadhyay ◽  
Sitansh Sharma
Keyword(s):  
Transition Metal ◽  
Metal Ions ◽  
Aqueous Media ◽  
Transition Metal Ions ◽  
Computational Approach

Preparation and properties of some rare-earth phthalocyanines

1974 ◽  
Vol 27 (5) ◽  
pp. 955 ◽  
Author(s):  
AG MacKay ◽  
JF Boas ◽  
GJ Troup
Keyword(s):  
Rare Earth ◽  
Metal Ions ◽  
Spectral Properties ◽  
Magnetic Moments ◽  
Anionic Form ◽  
Rare Earth Compounds ◽  
Acid Base ◽  
Polymeric Form ◽  
Acid Base Equilibrium ◽  
Trivalent Rare Earth

The preparations and magnetic and spectral properties of one ytterbium and two gadolinium phthalocyanines are described and comparisons made with previous studies. The susceptibility of all three compounds followed a Curie-Weiss law, with � small, and the magnetic moments were typical for trivalent rare-earth compounds with little or no coupling between the metal ions. The e.p.r. signals observed were due to the metal ions. Structures proposed are Cl(pc)YbCl,2H2O (where pc = C32H16N8) for ytterbium, and (pc)Gd(pc)H and an associated anionic form for gadolinium. Both gadolinium materials are stable under certain solution conditions, although the anionic material tends to decompose and is difficult to obtain from solution. A polymeric form of phthalonitrile (m.p. 306�C) was isolated during purification. A simple acid-base equilibrium is proposed for the gadolinium compounds but it is complicated by the separation procedures and by the nature and purity of the solvent.

scholarly journals Lead Oxide-Graphite Composite Electrode for pH Measurement

2015 ◽  
Vol 15 (1) ◽  
pp. 61-66
Author(s):  
Ranjan Nepal ◽  
Raja Ram Pradhananga
Keyword(s):  
Metal Ions ◽  
Lead Oxide ◽  
Composite Electrode ◽  
Low Cost ◽  
Potential Gradient ◽  
Ph Measurement ◽  
Indicator Electrode ◽  
Quick Response ◽  
Acid Base ◽  
Graphite Composite

Lead oxide-graphite composite electrode for pH measurement had been fabricated with different percentage of PbO2 in the composite. The proportions of lead oxide affected the sensitivity of the electrode. The electrode composed of 50% lead oxide and 50% graphite gave reproducible result and behaved in Nernstian manner with a potential gradient of -58.8±0.3 mV per unit change in pH. Metal ions such as iron (II), iron (III) and lead (II) interfered in the measurement of pH, while silver (I), copper (II), oxidizing agents such as dichromate and permanganate do not interfere. In absence of interfering ion, the lead oxide-graphite composite electrode could be used for the measurement of pH from 2 to 11. This electrode can also be used as an indicator electrode for acid base titrations. Low cost, quick response, easy to fabricate are some of the advantages of the lead oxide-graphite composite electrode. This electrode is also found to be sensitive to Pb2+ -ions and can be used as a Pb2+-ion sensor up to 10-4M.DOI: http://dx.doi.org/10.3126/njst.v15i1.12015  Nepal Journal of Science and TechnologyVol. 15, No.1 (2014) 61-66

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