Ion-selective determination of total metal ion concentration in an excess of complexing ligand using the standard additions method

The Analyst ◽  
1985 ◽  
Vol 110 (4) ◽  
pp. 359 ◽  
Author(s):  
Liliana Ilcheva ◽  
Maria Polianova ◽  
Jordan Dalukov ◽  
Brian R Chapman
Keyword(s):  
Metal Ion ◽  
Ion Concentration ◽  
Selective Determination ◽  
Total Metal ◽  
Standard Additions

Ion Exchange Complexing Resins as Sensors for the Determination of Free Metal Ion Concentration at a Low Level

2008 ◽  
Vol 26 (3) ◽  
pp. 301-320 ◽  
Author(s):  
Maria Pesavento ◽  
Antonella Profumo ◽  
Raffaela Biesuz ◽  
Giancarla Alberti
Keyword(s):  
Ion Exchange ◽  
Metal Ion ◽  
Ion Concentration ◽  
Low Level ◽  
Free Metal ◽  
Free Metal Ion

scholarly journals Determination of Trace Metal Ions in Common Salt by Stripping Voltammetry

1999 ◽  
Vol 82 (6) ◽  
pp. 1413-1418 ◽  
Author(s):  
Azza M M Ali
Keyword(s):  
Metal Ion ◽  
Supporting Electrolyte ◽  
Standard Addition ◽  
Stripping Voltammetry ◽  
Differential Pulse ◽  
Ion Concentration ◽  
Common Salt ◽  
Trace Metal Ions

Abstract Sensitive voltammetric methods using cathodic and anodic differential pulse stripping techniques were applied for determination of trace ions cadmium(II), cobalt(II), copper(II), lead(II), manganese(II), nickel(II), and zinc(II), which are usually found in different grades of common salt as contaminants. The optimal conditions, i.e., deposition time, preconcentration potential, supporting electrolyte, and ionic strength, were investigated for each metal ion. Concentration of the metal ion was determined by the standard addition method. Metal content varied according to the quality of the table salt.

Application of LIBD to the determination of the solubility product of thorium(IV)-colloids

2000 ◽  
Vol 88 (9-11) ◽  
Author(s):  
T. Bundschuh ◽  
R. Knopp ◽  
R. Müller ◽  
J. I. Kim ◽  
Volker Neck ◽  
...  
Keyword(s):  
Experimental Method ◽  
Metal Ion ◽  
Solubility Product ◽  
Solubility Data ◽  
Ion Concentration ◽  
Acidic Solutions ◽  
Laser Induced Breakdown ◽  
Colloid Formation

A new experimental method is presented for the determination of solubility data, which is based on the laser-induced breakdown detection (LIBD). The method is capable of monitoring the initial colloid generation when the metal ion concentration reaches or just exceeds the solubility at given pH. The application is made to determine the solubility of Th(IV) in acidic solutions at I = 0.5 M (NaCl) and 25 °C. The initial colloid formation is determined as a function the H

scholarly journals Schiff-Based Fluorescent-ON Sensor L Synthesis and Its Application for Selective Determination of Cerium in Aqueous Media

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Maria Sadia ◽  
Jehangir Khan ◽  
Robina Naz ◽  
Muhammad Zahoor ◽  
Ezzat Khan ◽  
...  
Keyword(s):  
Metal Ion ◽  
Limit Of Detection ◽  
Fluorescent Sensor ◽  
Aqueous Media ◽  
High Sensitivity ◽  
Transition Metal Ions ◽  
Acetonitrile Solution ◽  
Selective Determination ◽  
Sensitivity And Selectivity

In the present study, a fluorescent sensor L for sensing of Ce3+ ion was designed and characterized by XRD, 1HNMR, and FTIR. Its fluorescence behavior towards metal ion was examined by fluorescence spectroscopy. Chelation-enhanced fluorescence was shown by the sensor L upon interaction with Ce3+ ion. This fluorescent sensor exhibits high sensitivity and selectivity towards Ce3+ ion in acetonitrile solution, forming 2 : 1 (L : M) complex as determined by Job’s plot. Association constant was found to be 1×107 M−1 estimated from the Benesi-Hildebrand plot. No significant interference was observed in the presence of other studied alkali, alkaline, and transition metal ions. A rapid response was observed when employed for the determination of Ce3+ ion in spiked water samples with a limit of detection equal to 3.4×10−8 M.

Hg(II) Analysis Using Poly(cysteine)-rGO Electrode

2020 ◽  
Vol 18 (3) ◽  
pp. 179-187
Author(s):  
J. Jency Feminus ◽  
P. N. Deepa
Keyword(s):  
Modified Electrode ◽  
Metal Ion ◽  
Square Wave Voltammetry ◽  
Electrochemical Behaviour ◽  
Electrochemical Determination ◽  
Mercury Determination ◽  
Selective Determination ◽  
Wave Voltammetry ◽  
Reduced Graphene

In the present work, we have developed a sensitive platform for the selective determination of Hg(II) ions based on reduced graphene oxide (rGO) electrode modified with poly cysteine (Poly-Cys). The Poly-Cys/rGO modified electrode was characterised by SEM, ATR-IR and its electrochemical behaviour was investigated through cyclic voltammetry and square wave voltammetry. The synergistic effect of rGO and poly-cysteine favoured the complexation of Hg(II) ions onto the surface of the modified electrode. The ions were then anodically stripped and the corresponding voltammograms recorded. The process of complexation followed by stripping was repeated with increasing concentrations of the metal ion. The linear range for the electrochemical determination of Hg(II) using the modified electrode was found to be from 0.05 to 2.7 μM with a detection limit of 0.006 μM. In addition, the electrode also exhibited good stability with negligible sensitivity towards interfering metal ions. The analytical applicability of the modified electrode was investigated by carrying out mercury determination in water samples obtained from various sources.

Spectrophotometric determination of free, ionized, metal ion concentrations in solution by an indicator increment method. Application to the determination of free Mg2+ with calmagite

1995 ◽  
Vol 73 (2) ◽  
pp. 296-302
Author(s):  
Hongji Ren ◽  
Byron Kratochvil ◽  
Xiwen He
Keyword(s):  
Metal Ion ◽  
Ion Concentration ◽  
Multiple Equilibrium ◽  
Conditional Stability ◽  
Ligand Complex ◽  
Conditional Stability Constant ◽  
Visible Spectra ◽  
Free Magnesium ◽  
Free Metal

A spectrophotometric method, called the Indicator Increment Method, is described in which varying amounts of a complexing indicator are added to a sample and the visible spectra recorded after each addition. Through multiple equilibrium calculations the free metal ion concentration, as well as total metal and total ligand concentrations, can be estimated in systems that contain a single metal ion and one ligand. The technique was tested successfully for the determination of free magnesium in the presence of NTA, phosphate, or oxalate using calmagite as indicator. The method requires the approximate conditional stability constant of the metal–ligand complex to be known beforehand. Keywords: ionized magnesium, indicator increment method, spectrophotometry.

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