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Carvalho, Marcelo Souza de; Domingues, Maria de Lourdes F.; Mantovano, José Luiz; Cunha, José Waldemar Silva Dias da

doi:10.1023/a:1019649809404

Cited by 35 publications

(12 citation statements)

References 8 publications

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“…Considering the widespread use of thorium and its toxic properties, the development and improvement of analysis methods for the determination of thorium are vital. Therefore, many techniques have been used for the determination of thorium, including nuclear techniques, inductively coupled plasma/mass spectrometry, electrochemistry, ion chromatography, X‐ray fluorescence and so on . Among these analysis methods, fluorescence detection is a simple, rapid, highly selective, and low‐cost method for thorium ion determination.…”

Section: Methodsmentioning

confidence: 99%

Fluorogenic Thorium Sensors Based on 2,6‐Pyridinedicarboxylic Acid‐Substituted Tetraphenylethenes with Aggregation‐Induced Emission Characteristics

Wen

Liang

et al. 2015

Chemistry An Asian Journal

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A novel fluorescent sensor based on tetraphenylethene (TPE) modified with 2,6-pyridinedicarboxylic acid (PDA) that shows aggregation-induced emission (AIE) characteristics for thorium recognition with remarkable fluoresence enhancement response has been synthesized. This sensor is capable of visually distinguishing Th(4+) among lanthanides, transition metals, and alkali metals under UV light. Th(4+) can be detected by the naked eye at ppb levels owing to the AIE phenomenon. The sensor showed high selectivity for Th(4+) compared to all other metals tested, and this recognition displayed good anti-interference qualities. This study represents the first application of a AIE fluorescence sensor in actinide metal recognition and it has potential applications in environmental systems for thorium ion detection.

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Section: Methodsmentioning

confidence: 99%

Fluorogenic Thorium Sensors Based on 2,6‐Pyridinedicarboxylic Acid‐Substituted Tetraphenylethenes with Aggregation‐Induced Emission Characteristics

Wen

Liang

et al. 2015

Chemistry An Asian Journal

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“…The first reported method that employed PUFs for absorption was published 50 years ago by Bowen, but it was not until the 1990s that the use of PUFs in sample preparation procedures started to become more popular [20]. From that time onward and especially in the next two decades from 1990 to 2010, PUFs were used for the preconcentration of common metal species, such as iron [21,22], copper [23], zinc [6], and nickel [24], and rare metals, such as germanium [4], thorium [25], thallium [26], and uranium [27] from aqueous matrices. In most cases, the PUFs were used bare, without any functionalization, necessitating the addition of organic or inorganic ligands in the sample solution to form metal complexes that could be sorbed onto PUFs.…”

Section: The Beginning Of the Trendmentioning

confidence: 99%

“…By using these functionalized PUFs and spectrophotometric detection, recoveries between 99.2% and 100.2% were achieved for zinc granulates and lead foil samples, highlighting the great potential of the method. Similarly, 2-ethylhexylphosphonic acid was proposed as a reagent to functionalize PUFs, to produce selective PUFs for thorium [25]. Thorium ions were extracted based on a cation exchange mechanism.…”

Section: The Beginning Of the Trendmentioning

confidence: 99%

Sponges and Sponge-Like Materials in Sample Preparation: A Journey from Past to Present and into the Future

Chatzimitakos

Stalikas

2020

Molecules

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Even though instrumental advancements are constantly being made in analytical chemistry, sample preparation is still considered the bottleneck of analytical methods. To this end, researchers are developing new sorbent materials to improve and replace existing ones, with the ultimate goal to improve current methods and make them more efficient and effective. A few years ago, an alternative trend was started toward sample preparation: the use of sponge or sponge-like materials. These materials possess favorable characteristics, such as negligible weight, open-hole structure, high surface area, and variable surface chemistry. Although their use seemed promising, this trend soon reversed, due to either the increasing use of nanomaterials in sample preparation or the limited scope of the first materials. Currently, with the development of new materials, such as melamine sponges, along with the advancement in nanotechnology, this topic was revived, and various functionalizations were carried out on such materials. The new materials are used as sorbents in sample preparation in analytical chemistry. This review explores the development of such materials, from the past to the present and into the future, as well as their use in analytical chemistry.

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“…Desse modo, a XRF passou a ser empregada em pesquisas em ciências ambientais relacionadasà determinação de elementos químicos emáguas contaminadas eáguas naturais [9][10][11] e também em estudos vinculados a análises de metais em solos [12]. Além disso, na Botânica,é possível ver a técnica de XRF sendo utilizada na classificação de algumas espécies, gêneros e famílias de plantas, além da possibilidade de analisar e determinar a presença de cobre e molibdênio em plantas [13][14].…”

Section: Xrf E Suas Aplicaçõesunclassified

A utilização e a relevância multidisciplinar da fluorescência de raios X

Nascimento-Dias

Oliveira

Anjos

2017

Rev. Bras. Ensino Fís.

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A utilização das aplicações tecnológicas baseadas nos princípios científicos em raios X durante muito tempo foram utilizadas apenas como ferramentas de diagnósticos médicos. Contudo, a espectroscopia de fluorescência de raios X tem demonstrado possuir uma grande relevância multidisciplinar em inúmeros campos de investigação tais como: meteorítica, química, biologia, meio ambiente, geociências, arqueometria e ciência dos materiais. Buscamos fornecer uma breve síntese seletiva dos recentes trabalhos, buscando assim demonstrar a ampla gama de questões, nas quais ela pode ser aproveitada de maneira produtiva, principalmente devidoà sua característica de ser uma técnica não destrutiva. Por fim, serão discutidas aqui as possibilidades de aplicações de forma sucinta e as vantagens específicas da fluorescência de raios X. Palavras-chave: XRF, física aplicada, ciências dos materiais, meteoritos, técnica analíticaThe utilization of technological applications based on scientific principles in X-rays for a long time were only used as medical diagnostic tools. However, X-ray fluorescence spectroscopy has been shown to have a high multidisciplinary relevance in many research fields such as; Meteoritc, chemistry, biology, environment, geosciences, archeometry and materials science. We seek to provide a selective synthesis of the recent works, demonstrating a wide range of issues which can be harnessed productively mainly because of its characteristic of being a non-destructive tech-nique. Finally, here will be discusses the possibilities of applications and the specific advantages of X-ray fluorescence Keywords: XRF, applied physics, sciencie of materials, meteorites, technique analytical IntroduçãoMuitos físicos eminentes no final do século XIX acreditavam que a natureza do mundo físico estava substancialmente esclarecida. Entretanto, este paradigma foi rompido já nestaépoca por uma série de descobertas em um curto intervalo de tempo. Muitas dessas descobertas envolviam inovações científicas provenientes do estudo de radiações e ondas eletromagnéticas. Neste período, ocorreu a descoberta dos raios X em 1895 por Wilhelm Conrad Roentgen, a radioatividade foi observada pela primeira vez em 1896 por Henri Becquerel e o elétron foi descoberto por Joseph John Thomson em 1897.No entanto, dentre tantas descobertas e acontecimentos científicos marcantes que ocorreram nestaépoca, talvez possa ser dito que a descoberta que possuiu a maior importância para a origem e desenvolvimento das tecnologias baseadas em raios X , tenha sido a de Wilhelm Conrad Roentgen a partir do experimento com raios catódicos [1]. Basicamente, o fenômeno para se produzir raios X, nessa ocasiãoé decorrente de feixes de elétrons que são emitidos por um fio aquecido e que são atraídos * Endereço de correspondência: bruno.astrobio@gmail.com.por uma placa metálica com polaridade positiva (anodo) com relação a placa emissora (catodo), com todo este esquema funcionando dentro de um recipiente com atmosfera rarefeita. Além disso, logo após o primeiro registro da ossatu...

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Untitled

Cited by 35 publications

References 8 publications

Fluorogenic Thorium Sensors Based on 2,6‐Pyridinedicarboxylic Acid‐Substituted Tetraphenylethenes with Aggregation‐Induced Emission Characteristics

Fluorogenic Thorium Sensors Based on 2,6‐Pyridinedicarboxylic Acid‐Substituted Tetraphenylethenes with Aggregation‐Induced Emission Characteristics

Sponges and Sponge-Like Materials in Sample Preparation: A Journey from Past to Present and into the Future

A utilização e a relevância multidisciplinar da fluorescência de raios X

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