Determination of some inorganic species of Fe, Mn and Cr by chemical vapor generation hyphenated with inductively coupled plasma atomic emission spectrometry

Wełna, Maja; Lasowska, Joanna; Żyrnicki, W.

doi:10.1590/s0103-50532011000600023

Cited by 27 publications

(11 citation statements)

References 14 publications

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“…The system consisted of a modified cyclonic spray chamber, a parallel pneumatic nebulizer (Burgener) and peristaltic pumps with delivery tubes (Welna et al 2011). In the manifold applied, an acidified sample solution was mixed with the reductant solution in a Yjunction and then, the reaction mixture was introduced at the bottom of the chamber to a special reaction cavity.…”

Section: Hydride Generationmentioning

confidence: 99%

Improvement of Determination of Trace Amounts of Arsenic and Selenium in Slim Coffee Products by HG-ICP-OES

2013

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A method for the determination of total inorganic arsenic and selenium in slim instant coffees using hydride generation inductively coupled plasma optical emission spectrometry (HG-ICP-OES) was proposed. Various sample preparation procedures, including the traditional total decomposition by the hot-plate or microwave heating in a HNO 3 /H 2 O 2 mixture and alternative procedures based on the solubilisation in aqua regia or tetramethyl ammonium hydroxide (TMAH) and the dilution only with water or a low concentrated HNO 3 solution were examined and compared. Corresponding As and Se hydrides were generated in the reaction of an acidified sample solution with the NaBH 4 reductant in the presence of antifoam A. A small sample preparation with aqua regia in an ultrasonic bath followed by the pre-reduction with KI-ascorbic acid in the HCl medium for total As and the boiling with HCl for total Se were found to be optimal. The external calibration using standards treated and measured as the same as samples were applied for the analysis. Limits of detection (LODs) of 0.96 and 0.55 ng ml −1 were assessed for As and Se, respectively. The precision (as the relative standard deviation [RSD]) was within 1.6-7.1 %. The accuracy of the method was confirmed by the recovery test and the analysis of a standard reference material (non-fat milk powder, SRM 1459). The developed procedure was applied for the analysis of six commercial instant slim coffee products available in the Polish market and it was found that these products contain traces of As (0.114-0.247 μg g −1 ) and Se (0.089-0.137 μg g −1 ).

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Section: Hydride Generationmentioning

confidence: 99%

Improvement of Determination of Trace Amounts of Arsenic and Selenium in Slim Coffee Products by HG-ICP-OES

2013

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“…For the studied sample introduction systems emission spectra of Sn, Hg, H, Ar, Mg, OH, and CN were recorded while Fe lines were observed only if the PN and PN + CVG systems were used. At the condition of CVG in this study, intensities of the Fe lines were too low for reliable measurements, although the formation of volatile Fe compounds in the reaction with NaBH 4 was indicated [41,42]. Unlike Sn and Hg that both easily form volatile species in the reaction with NaBH 4 , the signals derived from Mg at the CVG mode were observed due to the transport of a fine aerosol [17].…”

Section: Resultsmentioning

confidence: 55%

Electron Density from Balmer Series Hydrogen Lines and Ionization Temperatures in Inductively Coupled Argon Plasma Supplied by Aerosol and Volatile Species

Borkowska‐Burnecka

Żyrnicki

Wełna

et al. 2016

International Journal of Spectroscopy

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Electron density and ionization temperatures were measured for inductively coupled argon plasma at atmospheric pressure. Different sample introduction systems were investigated. Samples containing Sn, Hg, Mg, and Fe and acidified with hydrochloric or acetic acids were introduced into plasma in the form of aerosol, gaseous mixture produced in the reaction of these solutions with NaBH4 and the mixture of the aerosol and chemically generated gases. The electron densities measured from Hα, Hβ, Hγ, and Hδ lines on the base of Stark broadening were compared. The study of the H Balmer series line profiles showed that the ne values from Hγ and Hδ were well consistent with those obtained from Hβ which was considered as a common standard line for spectroscopic measurement of electron density. The ne values varied from 0.56·1015 to 1.32·1015 cm−3 and were the highest at loading mixture of chemically generated gases. The ionization temperatures of plasma, determined on the base of the Saha approach from ion-to-atom line intensity ratios, were lower for Sn and Hg (6500–7200 K) than those from Fe and Mg lines (7000–7800 K). The Sn II/Sn I and Hg II/Hg I, Fe II/Fe I, and Mg II/Mg I intensity ratios and the electron densities (ne) were dependent on experimental conditions of plasma generation. Experimental and theoretically calculated ionization degrees were compared.

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“…They were next directly introduced into a ICP OES spectrometer. The system consisted of a modified cyclonic spray chamber that acted as a gas-liquid phase separator, a parallel Burgener-type pneumatic nebulizer, two Y-shaped (Y) connectors, a reaction coil, and three peristaltic pumps with delivery tubes (Welna et al 2011).…”

Section: Arsenic Hydride Generationmentioning

confidence: 99%

Non-chromatographic Speciation of Inorganic Arsenic in Rice by Hydride Generation Inductively Coupled Plasma Optical Emission Spectrometry

2018

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Simple, straightforward non-chromatographic method for inorganic arsenic (i-As) determination in rice using species-selective hydride generation (HG) combined with inductively coupled plasma optical emission spectrometry (ICP OES) without prior separation of methylated organoarsenicals (o-As) before measurements was developed and fully validated. i-As [As(III,V)] and o-As (DMA, MMA) species were extracted in aqua regia that oxidized As(III) to As(V), while integrity of both o-As forms was preserved. Arsenic hydrides from i-As were generated in reaction with NaBH 4 (1%) in strong acidic conditions (10 mol L −1 HCl) after pre-reduction of As(V) to As(III) in a KI (0.5%)-ascorbic acid (2%)-HCl (3 mol L −1) mixture. Reactivity of As species toward HG under conditions of a rice matrix was investigated in order to improve detectability and selectivity of i-As when o-As coexists. Interferences related to contribution of DMA and MMA to the As signal recorded for i-As were pointed out. Limitations of the method for DMA and matrix effects for MMA were found advantageous to selectively measure i-As by HG-ICP OES. No matrix effects on i-As allowed to use external calibration for its quantification. Detection limit of 0.28 ng g −1 (5.6 ng g −1 in original sample), precision < 5%, and adequate accuracy (96.5-103.9%), verified by the analyte recovery study, were achieved. Applicability of the method was demonstrated by i-As determination in nine brown rice samples. Its concentrations found along with the percentage of i-As to total As (obtained after microwave digestion and HG-ICP OES detection) were similar with these reported for this type of rice.

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Determination of some inorganic species of Fe, Mn and Cr by chemical vapor generation hyphenated with inductively coupled plasma atomic emission spectrometry

Cited by 27 publications

References 14 publications

Improvement of Determination of Trace Amounts of Arsenic and Selenium in Slim Coffee Products by HG-ICP-OES

Improvement of Determination of Trace Amounts of Arsenic and Selenium in Slim Coffee Products by HG-ICP-OES

Electron Density from Balmer Series Hydrogen Lines and Ionization Temperatures in Inductively Coupled Argon Plasma Supplied by Aerosol and Volatile Species

Non-chromatographic Speciation of Inorganic Arsenic in Rice by Hydride Generation Inductively Coupled Plasma Optical Emission Spectrometry

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