Spectrochemical Analysis of Aqueous Solutions by the Plasma Jet

1964 ◽  
Vol 18 (6) ◽  
pp. 166-170 ◽  
Author(s):  
P. A. Serin ◽  
K. H. Ashton
Keyword(s):  
Aqueous Solutions ◽  
Sulphuric Acid ◽  
Matrix Effect ◽  
Gas Flow ◽  
Plasma Jet ◽  
Spectrochemical Analysis ◽  
Organic Media ◽  
Optimum Conditions ◽  
The Matrix ◽  
Arc Current

The effects of tangential gas flow, arc current, and water irascible solvents on the sensitivity of the plasma jet source, when used with aqueous solutions, have been studied. The optimum conditions for sensitivity have been established and the use of certain mixed aqueous/organic media have been found to improve the limits of detection significantly The effects of hydrochloric, nitric, and sulphuric acid were investigated and found to depend on the nature of the acid but not on the concentration. The matrix effect was found to be less severe than with many methods of excitation. Two examples of the application of the plasma jet to analytical problems are reviewed briefly.

Plasma Spraying Using Ar-He-H2 Gas Mixtures

1998 ◽  
Author(s):  
S. Janisson ◽  
A. Vardelle ◽  
J.F. Coudert ◽  
B. Pateyron ◽  
P. Fauchais ◽  
...  
Keyword(s):  
Plasma Spraying ◽  
Gas Flow ◽  
Plasma Jet ◽  
Gas Mixtures ◽  
Gas Velocity ◽  
Gas Flow Rate ◽  
Static Behavior ◽  
Operating Variables ◽  
Arc Current ◽  
Plasma Guns

Abstract In D.C. plasma guns used for plasma spraying, the properties of the plasma forming-gas control, to a great extent, the characteristics of the plasma jet and the momentum, heat and mass transfer to the particles injected in the flow. This paper deals with mixtures of argon, helium and hydrogen and the effect of the volume composition of these mixtures on the dynamic and static behavior of the plasma jet. Both were investigated from the measurements of arc voltage and gas velocity. Correlations between these parameters and the operating variables (arc current, gas flow rate, gas mixture composition) were established from a dimensional analysis. The results were supported by the calculation of the thermodynamic and transport properties of the ternary gas mixtures used in this study.

A Modified QuEChERS Extraction and LC-MS/MS Method for the Determination of Pesticide Residues in Curry Leaves (Murraya koenigii)

2019 ◽  
Vol 6 (1) ◽  
pp. 30-41
Author(s):  
Ranjith Arimboor ◽  
Karunkara Ramakrishna Menon ◽  
Natarajan Ramesh Babu ◽  
Haneesh Chandran
Keyword(s):  
Sample Preparation ◽  
Matrix Effect ◽  
Retention Time ◽  
Pesticide Residues ◽  
Mobile Phase ◽  
Preparation Technique ◽  
Modified Quechers ◽  
Curry Leaves ◽  
Ms Analysis ◽  
The Matrix

Background:Increased consumer demand for curry leaves free from pesticides demands fast and reliable analytical methods for the analysis of pesticide residues.Objective:The optimization of a QuEChERS based sample preparation technique with improved analytical accuracy by removing interfering matrix components for LC-MS/MS analysis of pesticide residues from curry leaves.Methods:A modified QuEChERS solid phase extraction method was developed and validated for the analysis of 26 pesticides in fresh and dried curry leaves. The effects of the sample preparation steps and column retention time on the matrix suppression of analyte ions were also evaluated.Results:Validation parameters were found within an acceptable range. The matrix effect evaluation studies showed that the QuEChERS sample preparation was able to minimize the ion suppression of analytes due to co-eluting matrix of components and that a d-SPE clean up step had major role in reducing matrix effect. The gradient mobile phase with longer retention time for analytes resulted in comparatively lesser matrix effects than the isocratic mobile phase of non-polar nature. Even after the clean up, a considerable number of compounds had more than 20% reduction in their MS response in the gradient mobile phase.Conclusion:This study emphasized the need of proper sample clean up before a LC-MS/MS analysis and the usage of matrix matched standards and mobile phase that ultimately results in an appropriate analyte separation in reasonable retention times.

On the matrix-effect in the excitation of the atomic emission spectra of magnesites

1965 ◽  
Vol 30 (4) ◽  
pp. 1303-1310 ◽  
Author(s):  
M. Matherny ◽  
N. Pliešovská ◽  
Ž. Rybárová
Keyword(s):  
Matrix Effect ◽  
Emission Spectra ◽  
Atomic Emission ◽  
The Matrix

Study of potential oscillations during reaction of an aluminium single crystal with an aqueous KOH solution

1990 ◽  
Vol 55 (2) ◽  
pp. 345-353 ◽  
Author(s):  
Ivan Halaša ◽  
Milica Miadoková
Keyword(s):  
Aqueous Solutions ◽  
Single Crystal ◽  
Single Crystals ◽  
Periodic Potential ◽  
Optimum Conditions ◽  
Potential Oscillations ◽  
Dilute Aqueous Solutions ◽  
Experimental Findings ◽  
Kinetics Of

The authors investigated periodic potential changes measured on oriented sections of Al single crystals during spontaneous dissolution in dilute aqueous solutions of KOH, with the aim to find optimum conditions for the formation of potential oscillations. It was found that this phenomenon is related with the kinetics of the reaction investigated, whose rate also changed periodically. The mechanism of the oscillations is discussed in view of the experimental findings.

Activation of deionized water by atmospheric plasma jet in helium gas flow

2021 ◽  
Author(s):  
P. Y. Tan ◽  
O. H. Chin ◽  
R. Anpalagan ◽  
Y. T. Lau ◽  
H. C. Lee
Keyword(s):  
Gas Flow ◽  
Plasma Jet ◽  
Deionized Water ◽  
Atmospheric Plasma ◽  
Helium Gas

Evaluation of the matrix effect in the quantitative bio-oil analysis by gas chromatography

Fuel ◽  
2021 ◽  
Vol 290 ◽  
pp. 119866
Author(s):  
Eliane Lazzari ◽  
Érica A. Souza Silva ◽  
Thiago R. Bjerk ◽  
Jaderson K. Schneider ◽  
Elina Bastos Caramão
Keyword(s):  
Gas Chromatography ◽  
Matrix Effect ◽  
Oil Analysis ◽  
Bio Oil ◽  
The Matrix

scholarly journals Interfacial Aspects of Metal Matrix Composites Prepared from Liquid Metals and Aqueous Solutions: A Review

Metals ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1400
Author(s):  
Peter Baumli
Keyword(s):  
Aqueous Solutions ◽  
Physical Properties ◽  
Metal Matrix Composites ◽  
Metal Matrix ◽  
Liquid Metals ◽  
Interfacial Phenomena ◽  
Matrix Composites ◽  
Good Adhesion ◽  
Mechanical And Physical Properties ◽  
The Matrix

The paper reviews the preparation of the different metallic nanocomposites. In the preparation of composites, especially in the case of nanocomposites, interfacial phenomena play an important role. This review summarizes the literature on various interfacial phenomena, such as wettability and reactivity in the case of casting techniques and colloidal behavior in the case of electrochemical and electroless methods. The main contribution of this work lies in the evaluation of collected interfacial phenomena and difficulties in the production of metal matrix composites, for both nano-sized and micro-sized reinforcements. This study can guide the composite maker in choosing the best criteria for producing metal matrix composites, which means a real interface with good adhesion between the matrix and the reinforcement. This criterion results in desirable mechanical and physical properties and homogenous dispersion of the reinforcement in the matrix.

scholarly journals Influence of gas flow on argon microwave plasma jet at atmospheric pressure

2011 ◽  
Vol 206 (6) ◽  
pp. 1449-1453 ◽  
Author(s):  
Shouichiro Iio ◽  
Kosuke Yanagisawa ◽  
Chizuru Uchiyama ◽  
Katsuya Teshima ◽  
Naomichi Ezumi ◽  
...  
Keyword(s):  
Atmospheric Pressure ◽  
Gas Flow ◽  
Microwave Plasma ◽  
Plasma Jet

NbC and VC Nanoparticles Reinforced Fe-Si-Mn Matrix Composite In Situ Synthesized by Plasma Jet

2011 ◽  
Vol 415-417 ◽  
pp. 71-75
Author(s):  
Chun Xiang Cui ◽  
Yan Chun Li ◽  
Tie Bao Wang ◽  
Shuang Jin Liu ◽  
Suek Bong Kang
Keyword(s):  
Matrix Composite ◽  
Hybrid Composite ◽  
Gas Flow ◽  
Plasma Jet ◽  
Homogeneous Distribution ◽  
Active Nitrogen ◽  
Ceramic Particles ◽  
Nanometer Range ◽  
Short Time

In situ NbC and VC nanoparticles reinforced Fe-Si-Mn-Nb-V matrix composite was carried out using a plasma jet with a plasma gas flow of (Ar + CH4) for very short time. The process involve improving the efficiency of the reaction in terms of consumption of the available active nitrogen atoms as well as the production of very fine and homogeneous distribution of all reinforcing phases of ceramic particles, preferable in the nanometer range. The nanoreinforcements synthesized by in situ reaction in this hybrid composite are NbC and VC ceramic particles.

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