Sensitive determination of selenium by inductively coupled plasma mass spectrometry with flow injection and hydride generation in the presence of organic solvents

Olivas, Riansares Muñoz; Quétel, Christophe R.; Donard, Olivier F. X.

doi:10.1039/ja9951000865

Cited by 54 publications

(21 citation statements)

References 18 publications

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“…The degrees of ionization of As and Se would be enhanced by electron transfer from the analyes to the carbon or carbon-containing polyatomic ions. Similar charge transfer mechanism from C + -species to analyte atoms in the central channel of the plasma discharge had been provided by Campbell et al 16 , Olivas et al 17 and Al-Ammar et al 18 . Our group 19 had demonstrated that the signal enhancement of As, Se and Te was not due to improvement in the nebulization transport of the sample by Carry-over effect experiments of volatile organic solvent.…”

Section: Introductionsupporting

confidence: 69%

Signal Enhancement of Elements with Different Ionization Potential by Organic Solvent in ICP-MS

Jin¹,

Hu²,

Guo³

2014

Asian J. Chem.

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Signal enhancement of elements with different ionization potential by organic solvent in inductively coupled plasma mass spectrometry was investigated. In the presence of the 3 % methanol or 4 % glycerol, the enhancement factors were in the range of 1.5 to 2.8 compared with the aqueous solution for high ionization potential elements (e.g., As, Se etc.), while the factors were less than 1.5 for the low ionization potential elements (e.g., Ce, In etc.). Signal enhancement caused by sample nebulization-transport efficiency improved was less than 1.5, which was obtained by detecting the sample aerosol collected with cold trap. The degrees of ionization of As and Se in organic solvent were increased to 69-71 and 56-58 %, respectively. However, In and Ce were only slightly increased with organic solvent. Our results demonstrated that signal enhancement of elements with high ionization potential was mainly attributed to the increased degree of ionization in plasma, while the low ionization potential elements were mainly attributed to the improved sample nebulization-transport efficiency.

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Section: Introductionsupporting

confidence: 69%

Signal Enhancement of Elements with Different Ionization Potential by Organic Solvent in ICP-MS

Jin¹,

Hu²,

Guo³

2014

Asian J. Chem.

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“…20 For elements with a first ionization potential in the range of 9-11 eV, the improved ionization due to the carbon charge transfer reaction was advocated to explain the significant signal enhancements in the presence of C-based compounds. [16][17][18][19][20][21][22] Suppression of Xenon Interferences on Tellurium by Using 4% Ethanol. The spectral interferences on tellurium isotopes are given in Table I.…”

Section: Resultsmentioning

confidence: 99%

“…In order to negate these interferences, a precise controlled amount of KI and ascorbic acid has been proposed to reduce As(V) into the noninterfering state As(III) and Se(VI) to Se(0). 6 The effect of signal enhancement of elements with ionization potentials in the range of 9-11 eV by C-based compounds is a well-known phenomenon in ICP-MS. [14][15][16][17][18][19][20][21][22][23][24] In recent studies, the suppression of nitric acid matrix effects on the high first ionization potential elements (e.g., As, Se, and Te) by ethanol addition 21 and reduced non-spectral interference effects for Ge, As, and Se determinations in biological matrices by methane addition to the plasma were also reported. 23 However, the direct introduction of organic solvents into ICP-MS may produce carbon deposits on the interface, ion lenses, and fluctuation of the plasma due to the high energy necessary for the dissociation of organic molecules.…”

Section: Introductionmentioning

confidence: 99%

Direct Determination of Tellurium in Geological Samples by Inductively Coupled Plasma Mass Spectrometry Using Ethanol as a Matrix Modifier

Gao

Günther

et al. 2006

Appl Spectrosc

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Direct determination of tellurium in geological samples by inductively coupled plasma mass spectrometry (ICP-MS) is often complicated by its low abundance, poor analytical sensitivity, and the presence of xenon interferences. Therefore, a simplified and rapid method for direct determination of nanogram levels of tellurium in geological samples using ICP-MS by reduction of interferences and improvement of sensitivity was developed. It is impossible to resolve 126Te and 128Te from isotope interferences of Xe even by currently available high-resolution magnetic mass spectrometry due to the extremely small mass difference (0.001-0.002 amu). However, the addition of 4% ethanol was found to suppress the interferences of Xe by a factor of 6 and increases the sensitivity of Te determination in ICP-MS by a factor of 3 relative to the values obtained in conventional 3% (v/v) HNO3 solution at the corresponding optimum operating conditions, respectively. The detection limits of 126Te and 128Te were reduced by a factor of 7.2 and 8.8, respectively, and the limit of quantitation (LOQ) for 126Te in the presence of 4% ethanol was 1.5 ng g(-1) (the LOQ is expressed as the concentration in the solid samples, thereby taking into account the dilution factor of 1000). The agreement between the determined Te concentration values (r = 0.998) in various geological samples (n = 140) by using isotopes of 126Te and 128Te indicates negligible contributions of polyatomic interferences produced by the addition of ethanol at these m/z. The proposed method was successfully applied to the direct determination of nanogram levels of Te in a series of international geological reference materials.

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“…Another kind of interference encountered was the enhancement of Se signals by carbon (ionization energy, 11.26 eV; 15,16,19). It is suggested that the increased population of C + in the plasma increases the degree of ionization of Se by improving the transfer of electrons from Se (ionization energy, 9.75 eV) to C + (15).…”

mentioning

confidence: 99%

Application of Inductively Coupled Plasma/Mass Spectrometry for the Measurement of Chromium, Selenium, and Molybdenum in Infant Formula and Adult Nutritional Products: First Action 2011.19

Pacquette

Szabo

Thompson

2012

Journal of AOAC INTERNATIONAL

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An inductively coupled plasma/MS method was developed for the simultaneous determination of Cr, Se, and Mo in infant formula and other nutritional products. All samples were digested using a closed vessel microwave oven system, together with Ni and Te internal standards. The practical quantitation limits for Cr, Se, and Mo were 0.4, 0.2, and 0.4 ng/mL, respectively; dilution factors were 250 for powders and 50 for liquids. The Cr, Se, and Mo concentrations in 10 nutritional products were within specification limits; within-day and day-to-day (6 independent days) precision values were <5% RSD. For two control samples, the observed precision was < or = 2% RSD over 10 independent days. Cr, Se, and Mo results were within the certified limits in three National Institute of Standards and Technology standard reference materials. The average sample spike recoveries for 10 nutritional products ranged from 93 to 107%. Robustness studies showed a minimal effect from concomitant easily ionized element concentrations. However, the choice of internal standard and matrix-matching carbon content were critical to obtaining accurate Se results. All indications are that this method would be a suitable candidate as a global reference method for the determination of these trace elements in infant formula, adult nutritionals, and other nutritional

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Sensitive determination of selenium by inductively coupled plasma mass spectrometry with flow injection and hydride generation in the presence of organic solvents

Cited by 54 publications

References 18 publications

Signal Enhancement of Elements with Different Ionization Potential by Organic Solvent in ICP-MS

Signal Enhancement of Elements with Different Ionization Potential by Organic Solvent in ICP-MS

Direct Determination of Tellurium in Geological Samples by Inductively Coupled Plasma Mass Spectrometry Using Ethanol as a Matrix Modifier

Application of Inductively Coupled Plasma/Mass Spectrometry for the Measurement of Chromium, Selenium, and Molybdenum in Infant Formula and Adult Nutritional Products: First Action 2011.19

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