Results 81 to 90 of about 402,247 (342)

Estudo comparativo de métodos de preparo de amostras de tinta para a determinação de metais e metalóides por técnicas de espectrometria atômica Paint samples preparation methods for metals and methaloids determination by atomic spectrometry techniques

Química Nova, 2009
This work deals with paint decomposition methods for major, minor and trace elements determination. Three methods were investigated: (1) decomposition in closed quartz vessel and heating in microwave oven; (2) decomposition in open vessel using HNO3 and ...
Fabrina R. S. Bentlin, Dirce Pozebon, Fernanda dos Santos Depoi   +2 more
doaj   +1 more source

On-line preconcentration using dual mini-columns for the speciation of chromium(III) and chromium(VI) and its application to water samples as studied by inductively coupled plasma-atomic emission spectrometry [PDF]

, 2005
On-line preconcentration system for the selective, sensitive and simultaneous determination of chromium species was investigated. Dual minicolumns containing chelating resin were utilized for the speciation and preconcentration of Cr(III) and Cr(VI) in ...
Hamada, Kazuhide, Ikenoue, Tamami, Motomizu, Shoji, Oshima, Mitsuko, Sabarudin, Akhmad, Sumida, Takashi   +5 more
core   +1 more source

Covalent Organic Frameworks for Photocatalytic CO2 Reduction: Metal Integration Principles, Strategies and Functions

Advanced Functional Materials, EarlyView.
Covalent organic frameworks (COFs) with metals have been recognized as versatile platforms for photocatalytic CO2 reduction (CO2PRR). Herein, an overview of metal integration strategies for COFs is systematically summarized. Regulatory mechanisms and structure–activity relationships between metal integration and COF‐based CO2PRR are emphasized.
Jie He, Minxian Zhang, Jinqiang Zhang, Hongqi Sun, Shaobin Wang, Xiaoguang Duan   +5 more
wiley   +1 more source

Multi-element analysis of Macedonian wines by inductively coupled plasma–mass spectrometry (ICP–MS) and inductively coupled plasma–optical emission spectrometry (IP–OES) for regional classification

Macedonian Journal of Chemistry and Chemical Engineering, 2013
Major, minor, and trace elements in wines from the Republic of Macedonia were determined in this study. Both inductively coupled plasma–mass spectrometry (ICP-MS) and inductively coupled plasma– optical emission spectrometry (ICP-OES) were used for ...
Violeta Ivanova-Petropulos, Helmar Wiltsche, Trajče Stafilov, Marina Stefova, Herber Motter, Ernst Lankmayr   +5 more
doaj   +1 more source

Facet‐Engineered S‐Scheme Heterostructure With Enhanced Active Sites for Efficient Photocatalytic Degradation of Organic Contaminants

Advanced Functional Materials, EarlyView.
The facet‐engineered ZnO/Zn3In2S6 heterostructure, dominated by {001} plane coupling, exposes abundant unsaturated Zn sites with elongated Zn─O bonds, directing photoexcited charge carriers along an S‐scheme pathway and suppressing recombination. Enhanced interfacial Zn adsorption toward bisphenol A and methylene blue further synergistically promotes ...
Yang Yang, Zisheng Du, Hongyuan Yang, Debabrata Bagchi, Ruotao Yang, Prashanth W. Menezes, Sugang Meng   +6 more
wiley   +1 more source

GaN directional couplers for integrated quantum photonics

, 2011
Large cross-section GaN waveguides are proposed as a suitable architecture to achieve integrated quantum photonic circuits. Directional couplers with this geometry have been designed with aid of the beam propagation method and fabricated using ...
Calvez, Stephane, Cryan, Martin J., Dawson, Martin D., Engin, Erman, Gu, Erdan, McKnight, Loyd, O'Brien, Jeremy L., Thompson, Mark G., Watson, Ian M., Zhang, Yanfeng   +9 more
core   +1 more source

Selective Separation of the Rare Earth Elements Dysprosium and Neodymium via Tailoring Nanocellulose Chemical Structure

Advanced Functional Materials, EarlyView.
Dicarboxylate‐modified anionic hairy cellulose nanocrystals exhibit a high selectivity for dysprosium(III) over neodymium(III). This selectivity arises from disordered dicarboxylate cellulose “hairs” that enable cooperative ionic coordination, hydrogen bonding, and strain‐induced conformational shrinkage.
Roya Koshani, Shang‐Lin Yeh, Karuna Anna Sajeevan, Mica L. Pitcher, Dawson Alexander, Ratul Chowdhury, Amir Sheikhi   +6 more
wiley   +1 more source

PROBLEMS OF IODIDE IONS DETERMINATION IN MULTIVITAMINS BY INDUCTIVELY COUPLED PLASMA ATOMIC-EMISSION SPECTROMETRY

Регуляторные исследования и экспертиза лекарственных средств, 2018
The article looks into the main problems of determination of iodine trace amounts in multivitamins by inductively coupled plasma-atomic emission spectrometry (ICP-AES), i.e. spectral overlaps attributable to macro-components, and the background effect of
V. M. Shchukin, E. Yu. Severinova, N. E. Kuz’mina, V. A. Yashkir, V. A. Merkulov   +4 more
doaj   +1 more source

Sustainable Catalyst‐Free PLG Networks: Recyclability, Biodegradability, and Functional Performance

Advanced Functional Materials, EarlyView.
A catalyst‐additive free covalent adaptable network is developed from star‐shaped poly(lactide‐co‐glycolide) cross‐linked with pyromellitic dianhydride, enabling internal carboxylic acid‐driven transesterification. The resulting biodegradable network exhibits mechanical robustness (Young's modulus ≈1.6 GPa), complete recyclability, rapid biodegradation
Lars Schwarzer, Emilia Fulajtar, Seema Agarwal   +2 more
wiley   +1 more source

Phlogopite/matrix, Cpx/matrix and Cpx/phlogopite trace element partitioning in true lamprophyres [PDF]

, 2011
This contribution summarizes the results of pilot determination of distribution coefficients for various trace elements between the phlogopite, clinopyroxene and surrounding matrix of calc-alkaline lamprophyres.
Kanický Viktor, Krmíček Lukáš, Krmíčková Michaela, Vaculovič Tomáš, Vašinová Galiová Michaela   +4 more
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