scholarly journals A new analytical method for determination of the nitrogen isotopic composition of methionine: Its application to aquatic ecosystems with mixed resources

2018 ◽  
Vol 16 (9) ◽  
pp. 607-620 ◽  
Author(s):  
Naoto F. Ishikawa ◽  
Yoshito Chikaraishi ◽  
Yoshinori Takano ◽  
Yoko Sasaki ◽  
Yuko Takizawa ◽  
...  
Keyword(s):  
Isotopic Composition ◽  
Analytical Method ◽  
Aquatic Ecosystems ◽  
Nitrogen Isotopic Composition

An analytical method for precise determination of the cadmium isotopic composition in plant samples using multiple collector inductively coupled plasma mass spectrometry

2015 ◽  
Vol 7 (6) ◽  
pp. 2479-2487 ◽  
Author(s):  
Rongfei Wei ◽  
Qingjun Guo ◽  
Hanjie Wen ◽  
Junxing Yang ◽  
Marc Peters ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Isotopic Composition ◽  
Analytical Method ◽  
Inductively Coupled Plasma ◽  
Isotope Ratios ◽  
Precise Determination ◽  
Inductively Coupled ◽  
Plant Samples ◽  
Plasma Mass Spectrometry

Three-isotope plots of Cd isotope ratios in plant samples and Cd standard materials are presented in this study.

scholarly journals Development and validation of an analytical method for the determination of lead isotopic composition using ICP-QMS

2010 ◽  
Vol 49 (3) ◽  
Author(s):  
M. T. Rodríguez-Salazar ◽  
O. Morton Bermea ◽  
E. Hernández-Álvarez ◽  
M. E. García-Arreola ◽  
M. T. Ortuño-Arzate
Keyword(s):  
Isotopic Composition ◽  
Analytical Method ◽  
Lead Isotopic Composition ◽  
Development And Validation

Este trabajo reporta un método para la determinación precisa y exacta la composición isotópica de Pb en matrices ambientales y geológicas mediante ICP-QMS. Se analizaron réplicas de tres materiales de referencia (AGV-2, SRM 2709 y JSO-1), por medio de ICP-QMS con el objeto de evaluar la calidad del procedimiento analítico. La discriminación de masas para Pb/Pb fue evaluado usando el material de referencia NIST 981, y esta corrección fue aplicada a los materiales de referencia antes mencionados, para obtener la exactitud del método analítico desarrollado. Se aplicó una estandarización interna con 205Tl para corregir la deriva instrumental. La composición isotópica obtenida para los materiales de referencia es comparable con los valores reportados (JSO-1 and SRM 2709) y certificados (AGV-2). Los valores de exactitud de los resultados obtenidos varían en promedio entre 0.002% para 207Pb/204Pb y 0.825% para 207Pb/206Pb. Estos resultados indican que el método ICP-QMS es confiable en términos de precisión y exactitud para la determinación de relaciones isotópicas de Pb en matrices de suelos y geológicas.

scholarly journals Determination of aquatic food-web structure based on compound-specific nitrogen isotopic composition of amino acids

2009 ◽  
Vol 7 (11) ◽  
pp. 740-750 ◽  
Author(s):  
Yoshito Chikaraishi ◽  
Nanako O. Ogawa ◽  
Yuichiro Kashiyama ◽  
Yoshinori Takano ◽  
Hisami Suga ◽  
...  
Keyword(s):  
Amino Acids ◽  
Isotopic Composition ◽  
Food Web ◽  
Aquatic Food Web ◽  
Food Web Structure ◽  
Web Structure ◽  
Nitrogen Isotopic Composition ◽  
Aquatic Food

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.

The Calculation of Turbulent Diffusion Coefficients in Aquatic Ecosystems

2019 ◽  
Vol 70 (11) ◽  
pp. 3903-3907
Author(s):  
Galina Marusic ◽  
Valeriu Panaitescu
Keyword(s):  
Transport Equation ◽  
Turbulent Diffusion ◽  
Diffusion Coefficients ◽  
Aquatic Ecosystems ◽  
Specific Area ◽  
Left Bank ◽  
The Right ◽  
Prut River

The paper deals with the issues related to the pollution of aquatic ecosystems. The influence of turbulence on the transport and dispersion of pollutants in the mentioned systems, as well as the calculation of the turbulent diffusion coefficients are studied. A case study on the determination of turbulent diffusion coefficients for some sectors of the Prut River is presented. A new method is proposed for the determination of the turbulent diffusion coefficients in the pollutant transport equation for specific sectors of a river, according to the associated number of P�clet, calculated for each specific area: the left bank, the right bank and the middle of the river.

scholarly journals A single-step purification method for the precise determination of the antimony isotopic composition of environmental, geological and biological samples by HG-MC-ICP-MS

2021 ◽  
Author(s):  
Ferrari Colin ◽  
Resongles Eléonore ◽  
Freydier Rémi ◽  
Casiot Corinne
Keyword(s):  
Isotopic Composition ◽  
Biological Samples ◽  
Precise Determination ◽  
Single Step ◽  
Functionalized Silica ◽  
Purification Method ◽  
Silica Powder ◽  
Icp Ms ◽  
Single Step Purification

Thiol-functionalized silica powder allowed single-step purification of antimony for exploring stable Sb isotope signatures in the environment.

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