Some characteristics of polyatomic ion spectra in inductively coupled plasma mass spectrometry

Nonose, Naoko; Matsuda, Naoki; Fudagawa, Noriko; Kubota, Masaaki

doi:10.1016/0584-8547(94)80084-7

Cited by 86 publications

(62 citation statements)

References 48 publications

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“…For the analysis of arsenic (m/z 75), polyatomic ions (such as 40 ) all could potentially cause spectroscopic interferences [42]. Oxides are the easiest to form in the ICP-MS system, and Ce and Ba combine with oxygen more easily compared to the other metal elements in the positive ionization process, forming the most common polyatomic ions [43,44]. Meanwhile, Ce and Ba can also easily become doubly charged ions because of their low second ionization energies [45].…”

Section: Interferencesmentioning

confidence: 99%

Extraction and detection of organoarsenic feed additives and common arsenic species in environmental matrices by HPLC–ICP-MS

Liu

Zhang

et al. 2013

Microchemical Journal

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Section: Interferencesmentioning

confidence: 99%

Extraction and detection of organoarsenic feed additives and common arsenic species in environmental matrices by HPLC–ICP-MS

Liu

Zhang

et al. 2013

Microchemical Journal

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“…In this experiment, a grounded metal shield is used between the load coil and the outside of the torch. The free electrons in the metal shield prevent the potential gradient on the load coil from coupling capacitively to the plasma [43][44][45]. However, the shield does not cover the entire outside of the torch; a small gap (~2.2 mm wide) is left to prevent buildup of circulating currents that would otherwise melt the shield [43].…”

Section: Suggested Causes Of Low Mar + Abundances: Collision-induced mentioning

confidence: 99%

Metal argide (MAr+) ions are lost during ion extraction in laser ablation-inductively coupled plasma-mass spectrometry

Witte

Houk

2012

Spectrochimica Acta Part B: Atomic Spectroscopy

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The abundance of metal argide (MAr + ) ions during laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) is measured during ablation of pure samples of transition metals. As expected, the relative abundance of MAr + ions to M + ions for various elements increases as the dissociation energy (D 0 ) of the ion increases. Gas kinetic temperatures (T gas ) are determined from the calculated MAr + /M + ratios and are used to indicate the origins of MAr + ions. The determined T gas values are very high, 8000 K to ≥ 20,000 K, which indicate that MAr + ions are much less abundant in the mass spectrum than expected based upon plasma conditions. Collision-induced dissociation (CID) during the ion extraction process is suggested to be responsible for removal of MAr + ions. Factors responsible for these collisions are discussed.

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“…Light ions pass through the supersonic expansion with low kinetic energy and are thus more vulnerable to space charge effects than heavy ions, which also hurts sensitivity for C ϩ . Use of a "cool" plasma [21][22][23][24] improves sensitivity for light, easily ionized elements like Li ϩ but is not an option for elements with high ionization energies (IE) like C (IE ϭ 11.26 eV).…”

Section: Sensitivity Improvementmentioning

confidence: 99%

Determination of carbon isotope ratios in amino acids, proteins, and oligosaccharides by inductively coupled plasma-mass spectrometry

Luong

Houk

2003

J. Am. Soc. Mass Spectrom.

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Carbon isotope ratios ( 12 C/ 13 C) are measured for aqueous solutions of tryptophan, myoglobin, and ␤-cyclodextrin using C ϩ ions from an inductively coupled plasma (ICP) and a prototype twin quadrupole mass spectrometer (MS). 13 C/ 12 C ratios can be determined with a relative standard deviation (RSD) of ϳ1%. This precision is close to the limiting value predicted by counting statistics (1.16%). Spectral interference on 13 C ϩ , presumably from 12 C 1 H ϩ , comes from the incomplete dissociation of myoglobin and/or ␤-cyclodextrin, but not tryptophan. Decreasing the aerosol gas flow rate slightly from that which yields maximum signal eliminates this 12 C 1 H ϩ interference. The count rate of the minor isotope ( 13 C ϩ ) can be artificially enhanced by increasing the voltage of the 13 C ϩ detector, and/or by shifting the ion beam splitter offset from the central axis. Instrumental modifications to the MS that improve the sensitivity are also described. I nductively coupled plasma mass spectrometry (ICP-MS) is a versatile technique for elemental and isotopic analysis. Applications of ICP-MS range from elemental determinations to isotopic analysis in nutrition, clinical studies, geochemistry, environmental studies, and the semiconductor and nuclear industries. ICP-MS has long linear dynamic range (eight orders of magnitude) and detection limits at part per trillion levels for many elements. Most ICP-MS instruments contain a quadrupole or magnetic sector mass spectrometer with a single detector. These are sequential devices that do not measure the various m/z values of interest at precisely the same time. They provide moderate to good precision in isotope ratio measurements, typically 0.05% relative standard deviation (RSD) on ratios close to unity, with substantially poorer precision on large or small ratios [1][2][3][4].Much of the instability in the ion signal is caused by flicker noise from the ICP. This source of noise can be eliminated by measuring the various m/z values at the same time using a multicollector magnetic sector device [5,6]. We have described a unique instrument with two quadrupole mass filters and an ion beam splitter that also eliminates the flicker noise contribution to isotope ratios [7]. Allen and co-workers have analyzed solid copper and steel samples using laser ablation with this twin quadrupole device. The isotope ratio precision reported by Allen et al. was 0.06 to 0.1% for 52 Cr/ 53 Cr, depending on the dwell time and averaging method used [8].This paper evaluates the performance obtained for measurement of carbon isotope ratios from organic compounds at natural isotopic abundance. The ultimate goal is to provide a method for carbon isotopic analyses in bioorganic molecules in aqueous solution. This is an ambitious goal, since carbon is only 1 to 5% ionized in the ICP [9]. Thus, the sensitivity (i.e., count rate per unit concentration) is much lower than that for the metals and metalloids usually determined by ICP-MS, and 13 C is only ϳ1% of 12 C. No more than 0.1% of the analyte ion...

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Some characteristics of polyatomic ion spectra in inductively coupled plasma mass spectrometry

Cited by 86 publications

References 48 publications

Extraction and detection of organoarsenic feed additives and common arsenic species in environmental matrices by HPLC–ICP-MS

Extraction and detection of organoarsenic feed additives and common arsenic species in environmental matrices by HPLC–ICP-MS

Metal argide (MAr+) ions are lost during ion extraction in laser ablation-inductively coupled plasma-mass spectrometry

Determination of carbon isotope ratios in amino acids, proteins, and oligosaccharides by inductively coupled plasma-mass spectrometry

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