Organic solvents as interferents in arsenic determination by hydride generation atomic absorption spectrometry with flame atomization

Karadjova, Irina; Lampugnani, Leonardo; Dědina, Jiřı́; D’Ulivo, Alessandro; Onor, Massimo; Tsalev, Dimiter L.

doi:10.1016/j.sab.2006.03.009

Cited by 18 publications

(7 citation statements)

References 11 publications

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“…At hydride generation, the major fraction of the organic residues probably remained in the liquid phase. Organic hydrides, which are likely to be generated [ 41 , 42 ], are not prone to be captured in a peroxide trap.…”

Section: Resultsmentioning

confidence: 99%

“…The exceptionally large shifts were only observed in the samples from CAE and CTR, in which residual organic compounds were detected (Tables 1 and 2 , Fig 4 ). [ 41 ] and [ 42 ] previously described the formation and transportation of organic hydrides in gaseous form to the plasma by cold vapor hydride generation devices. We thus speculate that isobaric interferences on one or several Se masses by such compounds induced the falsification of the instrumental mass bias and of the δ 82/76 Se values.…”

Section: Resultsmentioning

confidence: 99%

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Preparation and purification of organic samples for selenium isotope studies

et al. 2018

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Selenium (Se) is an important micronutrient but also a strong toxin with a narrow tolerance range for many organisms. As such, a globally heterogeneous Se distribution in soils is responsible for various disease patterns (i.e. Se excess and deficiency) and environmental problems, whereby plants play a key role for the Se entrance into the biosphere. Selenium isotope variations were proved to be a powerful tracer for redox processes and are therefore promising for the exploration of the species dependent Se metabolism in plants and the Se cycling within the Critical Zone. Plant cultivation setups enable systematic controlled investigations, but samples derived from them–plant tissue and phytoagar–are particularly challenging and require specific preparation and purification steps to ensure precise and valid Se isotope analytics performed with HG-MC-ICP-MS. In this study, different methods for the entire process from solid tissue preparation to Se isotope measurements were tested, optimized and validated. A particular microwave digestion procedure for plant tissue and a vacuum filtration method for phytoagar led to full Se recoveries, whereby unfavorable organic residues were reduced to a minimum. Three purification methods predominantly described in the literature were systematically tested with pure Se solution, high concentrated multi-element standard solution as well as plant and phytoagar as target matrices. All these methods efficiently remove critical matrix elements, but differ in Se recovery and organic residues. Validation tests doping Se-free plant material and phytoagar with a reference material of known Se isotope composition revealed the high impact of organic residues on the accuracy of MC-ICP-MS measurements. Only the purification method with no detectable organic residues, hydride generation and trapping, results in valid mass bias correction for plant samples with an average deviation to true δ82/76Se values of 0.2 ‰ and a reproducibility (2 SD) of ± 0.2 ‰. For phytoagar this test yields a higher deviation of 1.1 ‰ from the true value and a 2 SD of ± 0.1 ‰. The application of the developed methods to cultivated plants shows sufficient accuracy and precision and is a promising approach to resolve plant internal Se isotope fractionations, for which respective δ82/76Se values of +2.3 to +3.5 ‰ for selenate and +1.2 to +1.9 ‰ for selenite were obtained.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Preparation and purification of organic samples for selenium isotope studies

et al. 2018

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“…Since organic solvents are recognized as interferents in the determination of hydride forming elements, Karadjova et al [103] investigated the interference effects of various International Journal of Spectroscopy organic solvents miscible with water on As determination by hydride generation AAS employing two types of flame atomizers: miniature diffusion flame and flame in flame. The best tolerance to interferences was obtained by using flame in flame atomization together with higher Ar and H 2 supply rates and elevated observation heights.…”

Section: Flame Furnace and Hydride Generationmentioning

confidence: 99%

Old and New Flavors of Flame (Furnace) Atomic Absorption Spectrometry

Dionísio

Jesus

Amais

et al. 2011

International Journal of Spectroscopy

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This paper presents some recent applications of Flame Atomic Absorption Spectrometry (FAAS) to different matrices and samples. The time window selected was from 2006 up to March, 2011, and several aspects related to food, biological fluids, environmental, and technological samples analyses were reported and discussed. In addition, the chemometrics application for FAAS methods development was also taken into account, as well as the use of metal tube atomizers in air/acetylene flame. Preconcentration methods coupled to FAAS were discussed, and several approaches related to speciation, flotation, ionic liquids, among others were discussed. This paper can be interesting for researchers and FAAS users in order to see the state of the art of this technique.

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“…To a less extent, capillary electrophoresis has also been applied to arsenic speciation (26). Furthermore, the combination of liquid chromatography (LC) or ion chromatography (IC) with other atomic spectrometry detection, such as flame atomic absorption spectrometry (27,28), electrothermal atomic absorption spectrometry (29)(30)(31), inductively coupled plasma atomic emission spectrometry (ICP-AES) (32,33), or ICP-mass spectrometry (ICP-MS) (34-42) is used. All these sophisticated analytical techniques are very cost-intensive in terms of instrument acquisition and maintenance.…”

Section: Analytical Techniques For Arsenic Speciationmentioning

confidence: 99%

Simultaneous Determination of Arsenite and Arsenate in Arsenic Trioxide Injection by Dual Detection Ion Chromatography

Subramanian¹,

Hariganesh²,

Jeevan

et al. 2011

Journal of Chromatographic Science

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This paper describes a rapid method to determine arsenite assay and arsenate impurity in Arsenic Trioxide Injection using a single conductivity detector. The arsenite assay was determined in a non-suppressed conductivity detection mode and arsenate impurity was quantified in a suppressed conductivity detection mode. Dual-conductivity detections were enabled by valve switching and time programming. The method was validated with respect to specificity, linearity, precision, accuracy, stability, and limit of quantification. The limit of detection and quantification for arsenite were 0.855 mg/L and 2.593 mg/L, and 0.044 mg/L and 0.133 mg/L for arsenate, respectively.

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Organic solvents as interferents in arsenic determination by hydride generation atomic absorption spectrometry with flame atomization

Cited by 18 publications

References 11 publications

Preparation and purification of organic samples for selenium isotope studies

Preparation and purification of organic samples for selenium isotope studies

Old and New Flavors of Flame (Furnace) Atomic Absorption Spectrometry

Simultaneous Determination of Arsenite and Arsenate in Arsenic Trioxide Injection by Dual Detection Ion Chromatography

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