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.

K, Ca, Mg, and Zn in platelets, as determined by atomic absorption spectrometry with use of a sealed decomposition bomb and discrete nebulization.

1985 ◽  
Vol 31 (4) ◽  
pp. 609-612 ◽  
Author(s):  
T Makino
Keyword(s):  
Metal Ions ◽  
Atomic Absorption Spectrometry ◽  
Atomic Absorption ◽  
Accurate Determination ◽  
Absorption Spectrometry ◽  
New Method ◽  
Differential Centrifugation ◽  
Individual Variations

Abstract In this new method for precise and accurate determination of K, Ca, Mg, and Zn in platelets, small amounts of platelets, prepared by differential centrifugation and cell washing, are decomposed in a homemade mini-vessel, a sealed Teflon bomb. The metal ions in the decomposed sample are measured by atomic absorption spectrometry with discrete nebulization. Overall, CVs ranged from 0.8 to 4.8%. We investigated sex-related differences (none were found) and intra-individual variations.

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.

scholarly journals Ground-Based and Space Observations of Interacting Binaries

2011 ◽  
Vol 7 (S282) ◽  
pp. 21-26
Author(s):  
Panagiotis G. Niarchos
Keyword(s):  
Binary Systems ◽  
Accurate Determination ◽  
Space Missions ◽  
Light Curves ◽  
Physical Parameters ◽  
Multi Wavelength ◽  
Low Mass ◽  
Space Observations

AbstractMulti-wavelength observational data, obtained from ground-based and space observations are used to compute the physical parameters of the observed Interacting Binaries (IBs) and study the interactions and physical processes in these systems. In addition, the database of IBs from ground-based surveys and space missions will provide light curves for many thousands of new binary systems for which extensive follow up ground-based observations can be carried out. In certain cases, light curves of superior quality will allow studies of fine effects of stellar activity and very accurate determination of stellar parameters. Moreover, many new discoveries of interesting systems are expected from ground-based all-sky surveys and space missions, including low mass binaries and star-planet binary systems. The most important current and future programs of observations of IBs from ground and space are presented.

scholarly journals Real-time measurement system for determining metal concentrations in water-intensive processes

2020 ◽  
Vol 10 (1) ◽  
pp. 512-518
Author(s):  
Ekaterina Nikolskaya ◽  
Mika Liukkonen ◽  
Yrjö Hiltunen
Keyword(s):  
Metal Ions ◽  
Relaxation Rate ◽  
Metal Ion ◽  
Chemical Speciation ◽  
X Ray ◽  
Real Time Measurement ◽  
Paramagnetic Ions ◽  
Mining Water ◽  
Good Agreement

AbstractThe main purpose of this paper is to demonstrate the potential of time-domain nuclear magnetic resonance (TD-NMR) technology for monitoring the concentrations of metal ions in water-based solutions. The main focus of this work was paramagnetic ions, such as Mn2+, Cu2+, Fe3+, Fe2+, Zn2+ and Ni2+, which are often the principal metal components in mining waters. Laboratory samples of different concentrations of single metals and mixtures of them and samples of real mining water were used in the relaxation rate (R2) measurements. The measurements of single metal ions were used for the determination of the relaxivities of those ions. The concentrations of the ions in the mining water as a function of pH were also estimated by means of the X-ray fluorescence (XRF) method and ChemEQL software for calculating chemical speciation equilibria. Using these concentration values and the relaxivities of the metal ions, the total relaxation rate (R2) results were then calculated. Principally, the results of these three different determinations are in relatively good agreement. It can be concluded that TD-NMR has great potential for monitoring metal ion concentrations during water treatment.

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 Diclofenac Sodium Determination in Pharmaceutical Preparations After Complexation With Calcium and Magnesium and Molecular Modelling Study.

2021 ◽  
Author(s):  
Waheed Ali Soomro ◽  
Muhammad Yar Khuhawar ◽  
Taj Muhammad Jahaangir ◽  
Muhammad Farooque Lanjwani ◽  
Rafi-u-Zaman Brohi ◽  
...  
Keyword(s):  
Metal Ions ◽  
Aqueous Phase ◽  
Metal Ion ◽  
Limit Of Detection ◽  
Diclofenac Sodium ◽  
Pharmaceutical Preparations ◽  
Flame Atomic Absorption ◽  
Relative Standard ◽  
Complexation Reactions

Abstract The study was carried out for indirect determination of diclofenac sodium in preparations after complexation with Ca or Mg. The diclofenac was treated with the metals individually and the metal complexes formed as precipitates were extracted in chloroform or separated by centrifugation. A decrease in concentration of metal ions was observed in aqueous phase which was correlated with concentration of diclofenac sodium. The complexation reactions were optimized in terms of pH, nature of metal ion, extraction in chloroform or separation by centrifugation. The decrease in concentration of metal ions in aqueous phase was monitored using flame Atomic Absorption Spectrophotometry (AAS) or by complexometric titration with EDTA. The linear calibration range observed were from 40-200 µg /mland 40-200 ug/mL diclofenac sodium respectively by using both Ca and Mg. The limit of detection was 15 µg /mL diclofenac using Ca or Mg ions using both solvent extraction and precipitation methods with AAS. The method was repeatable with interday and intraday reproducibility with relative standard deviation within 5%. The method was applied for the determination of diclofenac from pharmaceutical preparations, Voltral, Voren, Qufen, Dicloplus, Dicloran with RSD% 1.3%-8.2%.

scholarly journals Extractive Spectrophotometric Determination of Pd(II) with Sodium Salt of Hexamethyleneiminecarbodithioate

2013 ◽  
Vol 23 ◽  
pp. 20-28
Author(s):  
S.D. Dhanavate ◽  
D.J. Garole ◽  
V.J. Garole ◽  
S.R. Tetgure ◽  
A.D. Sawant
Keyword(s):  
Metal Ions ◽  
Spectrophotometric Determination ◽  
Sodium Salt ◽  
Accurate Determination ◽  
Chelating Agent ◽  
Molar Absorptivity ◽  
Real Samples ◽  
Highly Sensitive ◽  
Ph Range

The reagent NaHMICdt·2H2O has found to be a good chelating agent for the spectrophotometric determination of various metal ions. The present investigation deals with spectrophotometric determination of Pd(II) by using NaHMICdt·2H2O. The reagent reacted with Pd(II) to give yellow complex extractable into toluene. Pd (II) was extracted quantitatively in the pH range 0.5-2.0. Pd(II)-HMICdt complex showed λmax at 435 nm. The extracted species has a 1:2 (M:L) stoicheometry. Beer’s law is obeyed in the range of 0.2-0.8 μg ml-1 of Pd (II). The molar absorptivity and the sandells sensitivity were found to be 0.754 x 104 lmol-1cm-1 and 0.0140 μg mol-1 cm-2 respectively. The effect of divers ion on the extraction of Pd(II) has been investigated. The proposed method is highly sensitive, selective, and simple and rapid has been applied for accurate determination of palladium in synthesis mixtures and real samples.

scholarly journals Sekam Padi untuk Menyerap Ion Logam Tembaga dan Timbal dalam Air Limbah

2014 ◽  
Vol 4 (1) ◽  
Author(s):  
Nurhasni Nurhasni ◽  
Hendrawati Hendrawati ◽  
Nubzah Saniyyah
Keyword(s):  
Waste Water ◽  
Metal Ions ◽  
Atomic Absorption ◽  
Rice Husk ◽  
Metal Ion ◽  
Absorption Efficiency ◽  
Static Method ◽  
Optimum Conditions ◽  
Duration Of Heating

Abstrak Penelitian ini bertujuan untuk memanfaatkan sekam padi sebagai penyerap ion logam tembaga dan timbal dalam air limbah telah dilakukan. Metode yang digunakan adalah metode statis (batch). Penentuan kondisi optimum meliputi massa adsorben, pH, konsentrasi adsorbat dan lama pemanasan. Hasil analisis menggunakan Spektrofotometer Serapan Atom (AAS) menunjukkan efisiensi penyerapan tertinggi pada air limbah multikomponen mencapai 99.38% untuk ion logam Pb. Analisis air limbah laboratorium kimia UIN Syarif Hidayatullah Jakarta, menunjukkan penyerapan tertinggi mencapai 78.57% untuk ion logam Cu. Kata kunci : sekam padi, adsorben ion logaam timbal, adsorben ion logam tembaga, air limbah   Abstract This research aims to  rice huskas absorbent of copper and lead metalions in the waste water. The method used is a static method (batch). Determination of optimum conditions includes adsorbent mass, pH, absorbate concentration and duration of heating. The analysis using Atomic Absorption Spectrophotometer (AAS) showed the highest absorption efficiency of Pb metal ion in multicomponent wastewater reached 99,38%. The analysis of wastewater from chemistry laboratorium UIN Syarif Hidayatullah Jakarta showed, the highest absorption of Cu metal ion was 78,57%. Keywords : rice husk, the metal ions cadmium, chromium metal ions, wastewater

scholarly journals Determination of metal ion concentrations by SERS using 2,2′-bipyridyl complexes

The Analyst ◽  
2015 ◽  
Vol 140 (19) ◽  
pp. 6538-6543 ◽  
Author(s):  
Julie Docherty ◽  
Samuel Mabbott ◽  
W. Ewen Smith ◽  
John Reglinski ◽  
Karen Faulds ◽  
...  
Keyword(s):  
Metal Ions ◽  
Metal Ion ◽  
Ion Concentrations

SERS of bipyridyl complexes for the discrimination of six different metal ions.

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