A highly sensitive eco-scale method for mercury determination in water and food using photochemical vapor generation and miniaturized instrumentation for capacitively coupled plasma microtorch optical emission spectrometry

Covaci, Enikő; Șenilă, Marin; Tănăselia, Claudiu; Angyus, Simion Bogdan; Ponta, Michaela; Darvasi, Eugen; Frentiu, Maria; Frențiu, Tiberiu

doi:10.1039/c8ja00054a

Cited by 20 publications

(8 citation statements)

References 59 publications

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“…The development of analytical methods to determine low Hg levels in food (including dietary supplements), environmental and biological samples is of great interest [16,17,18,19,20,21,22]. Also, for Hg monitoring in the environment, several methods and devices have been developed for passive sampling.…”

Section: Introductionmentioning

confidence: 99%

Mercury Determination in Natural Zeolites by Thermal Decomposition Atomic Absorption Spectrometry: Method Validation in Compliance with Requirements for Use as Dietary Supplements

et al. 2019

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Natural zeolites are hydrated aluminosilicate minerals that, due to their remarkable physical-chemical properties of being molecular sieves and cation exchangers, have applications in different areas such as environmental protection, catalysis, animal feed, and dietary supplements. Since natural zeolites may contain traces of undesirable compounds such as toxic metals, the accurate quantification of these elements is necessary. In this study, a direct method for Hg determination in zeolite samples based on the thermal desorption atomic absorption spectrometry (TD-AAS) technique is fully validated, taking into account the legislative requirements in the field. The chosen quantification limit was 0.9 µg kg−1, which is satisfactory for intended use. Trueness was evaluated by recovery rate using certified reference materials containing mercury, with satisfactory results. Other figures of merit, such as repeatability and measurement uncertainty, also fulfill the legislative requirements related to the analysis of dietary supplements. This paper presents, for the first time, a fully validated method for mercury determination in zeolite samples, and the obtained results reveal that the method can be applied successfully for the intended purpose.

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Section: Introductionmentioning

confidence: 99%

Mercury Determination in Natural Zeolites by Thermal Decomposition Atomic Absorption Spectrometry: Method Validation in Compliance with Requirements for Use as Dietary Supplements

et al. 2019

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“…According to previous works, PVG is one of the most ideal sampling techniques for the field analysis of toxic elements by microplasma optical emission spectrometry. − The feasibility of the use of the PVG-HS as a sampling method for the μPD-OES was investigated. 5 mL of a standard solution containing Hg (II), Ni (II), and 8% (v/v) formic acid were injected into vessels for simultaneous PVG.…”

Section: Resultsmentioning

confidence: 99%

Learning from Headspace Sampling: a Versatile High-Throughput Reactor for Photochemical Vapor Generation

Lin

Yang

et al. 2022

Anal. Chem.

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Inspired by the headspace sampling (HS) device, a versatile highthroughput photochemical reactor with twenty vessels serving as both the photochemical vapor generator and the HS device was developed for the rapid and sensitive determination of mercury, nickel, and selenium by coupling photochemical vapor generation (PVG) to atomic fluorescence spectrometry (AFS) or point discharge optical emission spectrometry (μPD-OES). The photochemical reactor utilized a specially designed annular UV lamp around which the vessels containing sample solution were automatically rotated and irradiated to yield gaseous analyte species. Subsequently, the species escaped into the headspace of vessels prior to introduction to the atomic spectrometer. Compared with the conventional flow injection (FI) or continuous flow (CF) PVG, the developed PVG-HS method possesses several unique advantages including high throughput (260 pcs h −1 ), high sensitivity, and the elimination of matrix interference from transition metal ions and the memory effect associated with the quantification of mercury. Limits of detection (LODs) of 0.002, 0.007, and 0.01 μg L −1 were obtained for Hg (II), Ni (II), and Se (IV) by PVG−HS−AFS, respectively, and 0.02 and 0.2 μg L −1 were obtained for Hg (II) and Ni (II) by PVG−HS−μPD-OES, respectively. The practicality of the reactor was evaluated by the detection of Hg (II), Ni (II), and Se (IV) in five certified reference materials, including water (GBW08603, GBW08607, and GBW(E)080395), National Research Council Canada dogfish liver (DOLT-5), fish protein (DORM-4), and three river water samples with good recoveries (92−106%).

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“…Currently, many traditional techniques have been developed for Hg 2+ analysis and detection, including inductively coupled plasma–optical emission spectrometry (ICP-OES) [ 4 ], chemical vapor generation–inductively coupled plasma–optical emission spectrometry (CVG-ICP-OES) [ 5 ], inductively coupled plasma–mass spectrometry (ICP-MS) [ 6 ], cold vapor atomic absorption spectroscopy (CVAAS) [ 7 ], atomic fluorescent spectroscopy [ 8 ], and electrochemical methods. Hg 2+ can be detected at pM concentrations by most of the abovementioned methods.…”

Section: Introductionmentioning

confidence: 99%

Function of Graphene Oxide as the “Nanoquencher” for Hg2+ Detection Using an Exonuclease I-Assisted Biosensor

Sun

Jin

et al. 2022

IJMS

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Graphene oxide is well known for its excellent fluorescence quenching ability. In this study, positively charged graphene oxide (pGO25000) was developed as a fluorescence quencher that is water-soluble and synthesized by grafting polyetherimide onto graphene oxide nanosheets by a carbodiimide reaction. Compared to graphene oxide, the fluorescence quenching ability of pGO25000 is significantly improved by the increase in the affinity between pGO25000 and the DNA strand, which is introduced by the additional electrostatic interaction. The FAM-labeled single-stranded DNA probe can be almost completely quenched at concentrations of pGO25000 as low as 0.1 μg/mL. A simple and novel FAM-labeled single-stranded DNA sensor was designed for Hg2+ detection to take advantage of exonuclease I-triggered single-stranded DNA hydrolysis, and pGO25000 acted as a fluorescence quencher. The FAM-labeled single-stranded DNA probe is present as a hairpin structure by the formation of T–Hg2+–T when Hg2+ is present, and no fluorescence is observed. It is digested by exonuclease I without Hg2+, and fluorescence is recovered. The fluorescence intensity of the proposed biosensor was positively correlated with the Hg2+ concentration in the range of 0–250 nM (R2 = 0.9955), with a seasonable limit of detection (3σ) cal. 3.93 nM. It was successfully applied to real samples of pond water for Hg2+ detection, obtaining a recovery rate from 99.6% to 101.1%.

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A highly sensitive eco-scale method for mercury determination in water and food using photochemical vapor generation and miniaturized instrumentation for capacitively coupled plasma microtorch optical emission spectrometry

Abstract: A sensitive method with a green profile for Hg determination in food and water was developed.

Cited by 20 publications

References 59 publications

Mercury Determination in Natural Zeolites by Thermal Decomposition Atomic Absorption Spectrometry: Method Validation in Compliance with Requirements for Use as Dietary Supplements

Mercury Determination in Natural Zeolites by Thermal Decomposition Atomic Absorption Spectrometry: Method Validation in Compliance with Requirements for Use as Dietary Supplements

Learning from Headspace Sampling: a Versatile High-Throughput Reactor for Photochemical Vapor Generation

Function of Graphene Oxide as the “Nanoquencher” for Hg2+ Detection Using an Exonuclease I-Assisted Biosensor

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