The spectrophotometric determination of europium(III) using Chrome Azurol S

Cattrall, Robert W.; Slater, S.J.E.

doi:10.1016/0026-265x(71)90053-1

Cited by 6 publications

(4 citation statements)

References 20 publications

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“…The range of ions that can be determined can be greatly expanded by coupling with specific organic ligands. 16,17 For instance, a combination of Chrome Azurol S (CAS) (1), an organic colorimetric reagent, with surfactants has been widely used for colorimetric analysis of different metal salts such as beryllium, 18 aluminium, 19 iron, 20 europium 21 and samarium. 22 Cetylpyridinium chloride (CPC) (2), a cationic surfactant, is one example of such materials that significantly enhance the sensitivity and detection limit of the analysis.…”

Section: Introductionmentioning

confidence: 99%

Quantitative monitoring of the removal of non-encapsulated material external to filled carbon nanotube samples

Martinčić

Pach

Ballesteros

et al. 2015

Phys. Chem. Chem. Phys.

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The endohedral functionalization of carbon nanotubes with both organic and inorganic materials allows the development of tailored functional hybrids whose properties benefit from the synergistic effects of the constituent compounds. Bulk filling of carbon nanotubes (CNTs) results in samples that contain a large amount of non-encapsulated material external to the CNTs. The presence of the external material is detrimental to the processing and application of the resulting hybrids. Here we introduce the use of UV-Vis spectroscopy to monitor the cleaning process, i.e. the elimination of non-encapsulated compounds. Chrome azurol S has been employed to assess the bulk removal of external samarium(iii) chloride from filled single-walled carbon nanotubes. Chrome azurol S is of interest since it can be used to quantify a large variety of materials in a fast, accurate and reliable manner. The parameters that control the cleaning process have been optimized, including the time, temperature, volume and sonication, to achieve a fast and complete removal of the external material.

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Section: Introductionmentioning

confidence: 99%

Quantitative monitoring of the removal of non-encapsulated material external to filled carbon nanotube samples

Martinčić

Pach

Ballesteros

et al. 2015

Phys. Chem. Chem. Phys.

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“…CPC/CAS complexes have been reported for several metal and rare-metal salts. 43,[46][47] The color of the solution becomes dark royal blue if the lutetium complex is formed and yellow when the lutetium salt is not present (Figure S1). This allows a quick and non-destructive on-site assessment of the removal of external salts.…”

Section: Resultsmentioning

confidence: 99%

“…To benefit from such fast qualitative monitoring, and despite LuCl 3 giving a colorless water solution, we used a salt complexation method and added CPC/CAS (Cetylpyridinium chloride/Chromeazurol-S) to the collected filtrates. CPC/CAS complexes have been reported for several metal and rare-metal salts. ,, The color of the solution becomes dark royal blue if the lutetium complex is formed and yellow when the lutetium salt is not present (Figure S1). This allows a quick and nondestructive on-site assessment of the removal of external salts.…”

Section: Results and Discussionmentioning

confidence: 99%

Filling Single-Walled Carbon Nanotubes with Lutetium Chloride: A Sustainable Production of Nanocapsules Free of Nonencapsulated Material

Kierkowicz

González‐Domínguez

Pach

et al. 2017

ACS Sustainable Chem. Eng.

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Filled carbon nanotubes are of interest for a wide variety of applications ranging from sensors to magnetoelectronic devices and going through the development of smart contrast and therapeutic agents in the biomedical field. In general, regardless of the method employed, bulk filling of carbon nanotubes results in the presence of a large amount of external nonencapsulated material. Therefore, further processing is needed to achieve a sample in which the selected payload is present only in the inner cavities of the nanotubes. Here, we report on a straightforward approach that allows the removal of nonencapsulated compounds in a time efficient and environmentally friendly manner, using water as a "green" solvent, while minimizing the residual waste. The results presented herein pave the way toward the production of large amounts of high-quality closed-ended filled nanotubes, also referred to as carbon nanocapsules, readily utilizable in the foreseen applications

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“…However, the pH optimum for sensitive detection of REEs with this dye is between pH 7.0 and 7.5, where other ions, such as iron(III) and copper(II), will significantly interfere with the assay. In addition, the sensitivity of this dye is generally lower ( 31 , 32 ).…”

Section: Introductionmentioning

confidence: 99%

Facile Arsenazo III-Based Assay for Monitoring Rare Earth Element Depletion from Cultivation Media for Methanotrophic and Methylotrophic Bacteria

Hogendoorn

Roszczenko-Jasińska

Martinez‐Gomez

et al. 2018

Appl Environ Microbiol

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Recently, methanotrophic and methylotrophic bacteria were found to utilize rare earth elements (REEs). To monitor the REE content in culture media of these bacteria, we have developed a rapid screening method using the Arsenazo III (AS III) dye for spectrophotometric REE detection in the low μM (0.1 to 10 μM) range. We designed this assay to follow LaIII and EuIII depletion from the culture medium by the acidophilic verrucomicrobial methanotroph Methylacidiphilum fumariolicum strain SolV. The assay can also be modified to screen the uptake of other REEs, such as PrIII, or to monitor the depletion of LaIII from growth media in neutrophilic methylotrophs such as Methylobacterium extorquens strain AM1. The AS III assay presents a convenient and fast detection method for REE levels in culture media and is a sensitive alternative to inductively coupled plasma mass spectrometry (ICP-MS) or atomic absorption spectroscopy (AAS).IMPORTANCE REE-dependent bacterial metabolism is a quickly emerging field, and while the importance of REEs for both methanotrophic and methylotrophic bacteria is now firmly established, many important questions, such as how these insoluble elements are taken up into cells, are still unanswered. Here, an Arsenazo III dye-based assay has been developed for fast, specific, and sensitive determination of REE content in different culture media. This assay presents a useful tool for optimizing cultivation protocols, as well as for routine REE monitoring during bacterial growth without the need for specialized analytical instrumentation. Furthermore, this assay has the potential to promote the discovery of other REE-dependent microorganisms and can help to elucidate the mechanisms for acquisition of REEs by methanotrophic and methylotrophic bacteria.

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The spectrophotometric determination of europium(III) using Chrome Azurol S

Cited by 6 publications

References 20 publications

Quantitative monitoring of the removal of non-encapsulated material external to filled carbon nanotube samples

Quantitative monitoring of the removal of non-encapsulated material external to filled carbon nanotube samples

Filling Single-Walled Carbon Nanotubes with Lutetium Chloride: A Sustainable Production of Nanocapsules Free of Nonencapsulated Material

Facile Arsenazo III-Based Assay for Monitoring Rare Earth Element Depletion from Cultivation Media for Methanotrophic and Methylotrophic Bacteria

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