Ultra-trace determination of thallium(I) using a nanocomposite consisting of magnetite, halloysite nanotubes and dibenzo-18-crown-6 for preconcentration prior to its quantitation by ET-AAS

Afshar, Elham Ashrafzadeh; Taher, Mohammad Ali; Fazelirad, Hamid

doi:10.1007/s00604-016-2040-z

Cited by 15 publications

(2 citation statements)

References 33 publications

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“…To this end, the regulatory guidance for Cd 2+ in drinking water has been formulated by World Health Organization (WHO, 3 ng mL −1 ) and U.S. Environmental Protection Agency (EPA, 5 ng mL −1 ), respectively. In addition, various analytical techniques including electrothermal atomization atomic absorption spectroscopy (ET-AAS) [ 4 , 5 , 6 ], inductively coupled plasma mass spectroscopy (ICP-MS) [ 7 , 8 , 9 , 10 ] and graphite furnace atomic absorption spectrometry (GFAAS) [ 11 , 12 ], have been employed to determine Cd 2+ in laboratory. As far as on-site and real-time determination and monitoring of Cd 2+ in fields is concerned, the challenge comes as how to develop a convenient method without compromising performance and efficiency.…”

Section: Introductionmentioning

confidence: 99%

A Facile Aptasensor for Instantaneous Determination of Cadmium Ions Based on Fluorescence Amplification Effect of MOPS on FAM-Labeled Aptamer

et al. 2021

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Analytical performance and efficiency are two pivotal issues for developing an on-site and real-time aptasensor for cadmium (Cd2+) determination. However, suffering from redundant preparations, fabrications, and incubation, most of them fail to well satisfy the requirements. In this work, we found that fluorescence intensity of 6-carboxyfluorescein(FAM)-labeled aptamer (FAM-aptamer) could be remarkably amplified by 3-(N-morpholino)propane sulfonic acid (MOPS), then fell proportionally as Cd2+ concentration introduced. Importantly, the fluorescence variation occurred immediately after addition of Cd2+, and would keep stable for at least 60 min. Based on the discovery, a facile and ultra-efficient aptasensor for Cd2+ determination was successfully developed. The sensing mechanism was confirmed by fluorescence pattern, circular dichroism (CD) and intermolecular interaction related to pKa. Under the optimal conditions, Cd2+ could be determined rapidly from 5 to 4000 ng mL−1. The detection limit (1.92 ng mL−1) was also lower than the concentration limit for drinking water set by WHO and EPA (3 and 5 ng mL−1, respectively). More than a widely used buffer, MOPS was firstly revealed to have fluorescence amplification effect on FAM-aptamer upon a given context. Despite being sensitive to pH, this simple, high-performance and ultra-efficient aptasensor would be practical for on-site and real-time monitoring of Cd2+.

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Section: Introductionmentioning

confidence: 99%

A Facile Aptasensor for Instantaneous Determination of Cadmium Ions Based on Fluorescence Amplification Effect of MOPS on FAM-Labeled Aptamer

et al. 2021

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“…To minimize the associated potential health risks, the maximum concentration in drinking water for Cd 2+ is set at 5 ng/mL, as defined by the U.S. Environmental Protection Agency (EPA). Likewise, due to the high concern for determination and monitoring of Cd 2+ , a range of highly sensitive conventional techniques have been used, including electrothermal atomization atomic absorption spectroscopy (ET-AAS) [4,5], graphite furnace atomic absorption spectrometry (GFAAS) [6,7] and inductively coupled plasma mass spectroscopy (ICP-MS) [8][9][10]. All these conventional techniques are sensitive and accurate, but there are some limitations, such as laborious, time-consuming operation, and limited applicability for in-situ determination.…”

Section: Introductionmentioning

confidence: 99%

Label-Free and Sensitive Determination of Cadmium Ions Using a Ti-Modified Co3O4-Based Electrochemical Aptasensor

et al. 2020

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The current work demonstrates an electrochemical aptasensor for sensitive determination of Cd2+ based on the Ti-modified Co3O4 nanoparticles. In this unlabeled system, Ti-modified Co3O4 nanoparticles act as current signal amplifiers modified on the screen-printed carbon electrode (SPCE) surface, while the derivative aptamer of Cd2+ works as a target recognizer. In addition, the sensing is based on the increase in electrochemical probe thionine current signal due to the binding of aptamer to Cd2+ via specific recognition. In the current study, key parameters, including aptamer concentration, pH, and incubation time were optimized, respectively, to ensure sensing performance. Cyclic voltammetry was used not only to characterize each preparation and optimization step, but also to profile the bindings of aptamer to Cd2+. Under optimal conditions, Cd2+ can be determined in a linear range of 0.20 to 15 ng/mL, with a detection limit of 0.49 ng/mL, significantly below the maximum concentration limit set by the U.S. Environmental Protection Agency. Based on comparative analysis and the results of recovery test with real samples, this simple, label-free but highly selective method has considerable potential and thus can be used as an in-situ environmental monitoring platform for Cd2+ testing.

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Speciation analysis of Tl(I) and Tl(III) after magnetic solid phase extraction using a magnetite nanoparticle composite modified with aminodibenzo-18-crown-6 functionalized MIL-101(Cr)

Rezabeyk

Manoochehri

2018

Microchim Acta

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The authors describe a magnetic metal-organic framework nanocomposite consisting of aminodibenzo-18-crown-6 magnetite nanoparticles and MIL-101(Cr). It was employed to the speciation analysis of Tl(I) and Tl(III) ions. The sorbent is capable of selectively extracting Tl(I) while Tl(III) remains in solution. The total amount of thallium was then determined by reducing Tl(III) to Tl(I) by hydroxylamine hydrochloride and also extracting it. The extraction parameters were optimized by employing design of experiments methodology. Thallium was quantified by ET-AAS. Under optimized conditions, the detection limit is as low as 1.5 ng L, the quantification limit is 5.0 ng L, the linear range extends from 5 to 400 ng L, and the relative standard deviation is <12% (for n = 5 at levels of 5, 50 and 250 ng L). The recoveries of real samples analysis were in the range of 90-106%. The method was successfully applied to the analysis of a certified reference material (NIST SRM 1643d water sample) and to various real water samples. Graphical abstract A novel metal-organic framework nanocomposite consisting of aminodibenzo-18-crwon-6 magnetite nanoparticles (FeO@ADB18C6) and MIL-101(Cr) was synthesized, characterized and employed to speciation analysis of Tl(I) and Tl(III).

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Ultra-trace determination of thallium(I) using a nanocomposite consisting of magnetite, halloysite nanotubes and dibenzo-18-crown-6 for preconcentration prior to its quantitation by ET-AAS

Cited by 15 publications

References 33 publications

A Facile Aptasensor for Instantaneous Determination of Cadmium Ions Based on Fluorescence Amplification Effect of MOPS on FAM-Labeled Aptamer

A Facile Aptasensor for Instantaneous Determination of Cadmium Ions Based on Fluorescence Amplification Effect of MOPS on FAM-Labeled Aptamer

Label-Free and Sensitive Determination of Cadmium Ions Using a Ti-Modified Co3O4-Based Electrochemical Aptasensor

Speciation analysis of Tl(I) and Tl(III) after magnetic solid phase extraction using a magnetite nanoparticle composite modified with aminodibenzo-18-crown-6 functionalized MIL-101(Cr)

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