Studies on fluorescence determination of nanomolar Cr(iii) in aqueous solutions using unmodified silver nanoparticles

2012 ◽  
Vol 4 (10) ◽  
pp. 3407 ◽  
Author(s):  
M. Elavarasi ◽  
Madona L. Paul ◽  
A. Rajeshwari ◽  
N. Chandrasekaran ◽  
A. B. Mandal ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Aqueous Solutions ◽  
Fluorescence Determination

scholarly journals On the possibility of using «Grand-Potok» unit with MAÉS analyzer for analysis of solutions and water aerosols

2019 ◽  
Vol 85 (1II)) ◽  
pp. 86-90
Author(s):  
G. A. Shevelev ◽  
L. I. Vasilenko ◽  
E. N. Kamenskaya ◽  
T. S. Turmagambetov ◽  
O. M. Pakhorukova ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Laser Ablation ◽  
Aqueous Solutions ◽  
Detection Limits ◽  
Atomic Emission ◽  
Sample Injection ◽  
Input System ◽  
Powder Samples ◽  
Scintillation Method

Modernization of «Grand-Potok» atomic emission complex with MAÉS analyzer («VMK-Optoélektronika», Novosibirsk, Russia) first designed for analysis of powder samples is considered in view of the possibility of analysis of solutions and aqueous aerosols avoiding changes in the sample injection. It is shown that upgraded input system equipped with a nebulizer provides determination of platinum and gold in aqueous solutions with detection limits 1 – 5 ppm. Analysis of water aerosols with silver nanoparticles by scintillation method revealed the possibility of detecting separate silver nanoparticles about 200 nm and more. Thus we have demonstrated that modernization of the complex provides the possibility for analysis of solutions and aerosols obtained upon electro-spark and laser ablation of various materials, as well as for microanalysis of the objects.

scholarly journals Silver Nanoparticles: Green Synthesis, Characterization, and Their Usage in Determination of Mercury Contamination in Seafoods

2014 ◽  
Vol 2014 ◽  
pp. 1-5 ◽  
Author(s):  
Muhammad Ahad Ahmed ◽  
Najmul Hasan ◽  
Shaikh Mohiuddin
Keyword(s):  
Silver Nanoparticles ◽  
Aqueous Solutions ◽  
Ag Nanoparticles ◽  
Colorimetric Method ◽  
Mercury Contamination ◽  
Selective Detection ◽  
Vis Spectroscopy ◽  
Mercuric Ions ◽  
Proportional Relationship

We demonstrate that silver nanoparticles undergo an interaction with Hg2+ found in traces. The PEG-PVP-stabilized Ag nanoparticles were successfully synthesized via a reduction approach and characterized with surface plasmon resonance UV/Vis spectroscopy. By utilizing the redox reaction between Ag nanoparticles and Hg2+, and the resulted decrease in UV/Vis signal, we develop a colorimetric method for detection of Hg2+ ion. A linear and inversely proportional relationship was found between the absorbance intensity of the Ag nanoparticles and the concentration of Hg2+ ion over the range from 10 ppm to 1 ppm at absorption on 411 nm. The detection limit for Hg2+ ions in homogeneous aqueous solutions is estimated to be 1 ppm. This system shows excellent selectivity for Hg2+. The results found have potential implications in the development of new colorimetric sensors for easy and selective detection and monitoring of mercuric ions in aqueous solutions. The proposed method was successfully applied to quantify the amount of mercury in seafood.

Determination of ferric ions using surface-enhanced Raman scattering based on desferrioxamine-functionalized silver nanoparticles

2013 ◽  
Vol 49 (72) ◽  
pp. 7962-7964 ◽  
Author(s):  
Fei Yan ◽  
Yam K. Shrestha ◽  
Charina L. Spurgeon
Keyword(s):  
Silver Nanoparticles ◽  
Raman Scattering ◽  
Aqueous Solutions ◽  
Spectroscopic Method ◽  
Surface Enhanced Raman Scattering ◽  
Ferric Ions ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

A simple, robust and reproducible spectroscopic method based on surface-enhanced Raman scattering with nanomolar sensitivity has been developed for selective iron(iii) determination in aqueous solutions.

X-ray fluorescence determination of zinc sulfate in acidic zinc plating electrolyte

2020 ◽  
Vol 86 (10) ◽  
pp. 18-22
Author(s):  
K. N. Vdovin ◽  
K. G. Pivovarova ◽  
N. A. Feoktistov ◽  
T. B. Ponamareva
Keyword(s):  
Zinc Sulfate ◽  
Zinc Coating ◽  
Electrolyte Composition ◽  
Complexometric Titration ◽  
X Ray ◽  
Fluorescence Determination ◽  
Zinc Plating ◽  
Zinc Determination

Zinc sulfate is the main component in the composition of the acidic zinc plating electrolyte. Deviation in the electrolyte composition from the optimum content leads to destabilization of the electrolysis process and deteriorate the quality of the resulting zinc coating. The proper quality of a zinc coating obtained by galvanic deposition can be ensured only with timely monitoring and adjustment of the electrolyte composition. A technique of X-ray fluorescence determination of zinc (in terms of zinc sulfate) in an acidic zinc plating electrolyte is proposed. The study was carried out using an ARL Quant’X energy dispersive spectrometer (Thermo Fisher Scientific, USA) with a semiconductor silicon-lithium detector. The features of the spectrometer design are presented. The optimal parameters of excitation and detection of zinc radiation were specified when the electrolyte sample was diluted 1:1000. The ZnKα1 line was used as an analytical line. The plotted calibration graph is linear, the correlation coefficient being 0.999234. The results of zinc determination according to the developed method were compared with the data of the reference method of complexometric titration to prove the reliability of the procedure. The results are characterized by good convergence and accuracy. The proposed method of X-ray fluorescence zinc determination in a zinc plating electrolyte equals complexometric titration in the limiting capabilities and even exceeds the latter in terms of the simplicity of sample preparation and rapidity. The developed method of X-ray fluorescence determination of zinc is implemented in analysis of the electrolyte used in the continuous galvanizing unit at «METSERVIS LLC».

LUMINESCENT DETERMINATION OF SUGAR IN NATURAL HONEY

2020 ◽  
Vol 0 (4) ◽  
pp. 29-32
Author(s):  
B.M. GAREEV ◽  
◽  
A.M. ABDRAKHMANOV ◽  
G.L. SHARIPOV ◽  
◽  
...  
Keyword(s):  
Quantum Dots ◽  
Laboratory Test ◽  
Aqueous Solutions ◽  
Analytical Method ◽  
Sugar Content ◽  
Carbon Quantum Dots ◽  
Photoluminescence Intensity ◽  
Sucrose Content ◽  
Natural Honey

The photoluminescence of carbon quantum dots synthesized from natural honey and mixtures of honey and sugar has been studied. An increase in the sugar content leads to a decrease in the photoluminescence intensity without changing the shape of the luminescence spectrum of these quantum dots aqueous solutions, which is associated with a decrease in the yield of their synthesis in the sugar presence. The discovered effect can be used to detect sugar in honey. When examining five different market samples of flower honey using this method, two of them showed a significant decrease in the photoluminescence intensity. A laboratory test for compliance with GOST 19792-2017 Standard requirements established an excess of the sucrose content in these samples. Luminescent determination of sugar in honey does not require complicated equipment and can be used to develop a new analytical method for determining the sugar content in counterfeit natural honey.

X-Ray Fluorescence Determination of Ore Elements in Ferromanganese Formations

2020 ◽  
Vol 56 (14) ◽  
pp. 1423-1430
Author(s):  
V. M. Chubarov ◽  
A. A. Amosova ◽  
A. L. Finkelshtein
Keyword(s):  
X Ray ◽  
Fluorescence Determination

Sorption of Lead by the Selective Ion Exchanger Ostsorb DETA

1992 ◽  
Vol 57 (7) ◽  
pp. 1393-1404 ◽  
Author(s):  
Ladislav Svoboda ◽  
Jan Uhlíř ◽  
Zdeněk Uhlíř
Keyword(s):  
Phosphoric Acid ◽  
Aqueous Solutions ◽  
Functional Groups ◽  
Ion Exchanger ◽  
Preconcentration Procedure ◽  
Bead Cellulose

The properties of Ostsorb DETA, a selective ion exchanger based on modified bead cellulose with chemically bonded diethylenetriamine functional groups, were studied, and its applicability to the preconcentration of trace amounts of lead from aqueous solutions was verified. The conditions of the preconcentration procedure in the column and batch modes were optimized for this purpose. The results obtained were applied to the determination of lead in phosphoric acid.

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