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.

scholarly journals Simultaneous Determination of Metal Ions in Zinc Sulfate Solution Using UV–Vis Spectrometry and SPSE-XGBoost Method

Sensors ◽  
2020 ◽  
Vol 20 (17) ◽  
pp. 4936 ◽  
Author(s):  
Fei Cheng ◽  
Chunhua Yang ◽  
Can Zhou ◽  
Lijuan Lan ◽  
Hongqiu Zhu ◽  
...  
Keyword(s):  
Metal Ions ◽  
Real Time ◽  
Metal Ion ◽  
Sulfate Solution ◽  
Gradient Boosting ◽  
Feature Subset ◽  
Full Spectrum ◽  
Ion Concentrations ◽  
Extreme Gradient Boosting

Excessive discharge of heavy metal ions will aggravate environment pollution and threaten human health. Thus, it is of significance to real-time detect metal ions and control discharge in the metallurgical wastewater. We developed an accurate and rapid approach based on the singular perturbation spectrum estimator and extreme gradient boosting (SPSE-XGBoost) algorithms to simultaneously determine multi-metal ion concentrations by UV–vis spectrometry. In the approach, the spectral data is expanded by multi-order derivative preprocessing, and then, the sensitive feature bands in each spectrum are extracted by feature importance (VI score) ranking. Subsequently, the SPSE-XGBoost model are trained to combine multi-derivative features and to predict ion concentrations. The experimental results indicate that the developed “Expand-Extract-Combine” strategy can not only overcome problems of background noise and spectral overlapping but also mine the deeper spectrum information by integrating important features. Moreover, the SPSE-XGBoost strategy utilizes the selected feature subset instead of the full-spectrum for calculation, which effectively improves the computing speed. The comparisons of different data processing methods are conducted. It outcomes that the proposed strategy outperforms other routine methods and can profoundly determine the concentrations of zinc, copper, cobalt, and nickel with the lowest RMSEP. Therefore, our developed approach can be implemented as a promising mean for real-time and on-line determination of multi-metal ion concentrations in zinc hydrometallurgy.

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.

Determination of Trace Metal Ion Concentrations in Seawater

1996 ◽  
Vol 73 (7) ◽  
pp. 671 ◽  
Author(s):  
Michael N. Quigley ◽  
Fredrick Vernon
Keyword(s):  
Trace Metal ◽  
Metal Ion ◽  
Ion Concentrations ◽  
Trace Metal Ion

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 Determination of free heavy metal ion concentrations in soils around a cadmium rich zinc deposit

2007 ◽  
Vol 41 (4) ◽  
pp. 235-240 ◽  
Author(s):  
LI YI ◽  
YETANG HONG ◽  
DUOJUN WANG ◽  
YONGXUAN ZHU
Keyword(s):  
Heavy Metal ◽  
Metal Ion ◽  
Heavy Metal Ion ◽  
Zinc Deposit ◽  
Ion Concentrations

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 Determination of free metal ion concentrations with AGNES in low ionic strength media

2013 ◽  
Vol 689 ◽  
pp. 276-283 ◽  
Author(s):  
D. Aguilar ◽  
C. Parat ◽  
J. Galceran ◽  
E. Companys ◽  
J. Puy ◽  
...  
Keyword(s):  
Ionic Strength ◽  
Metal Ion ◽  
Ion Concentrations ◽  
Low Ionic Strength ◽  
Free Metal ◽  
Free Metal Ion
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