Accurate determination of arsenic and selenium in plant food samples by using ICP-MS/MS

2016 ◽  
Vol 8 (32) ◽  
pp. 6150-6157 ◽  
Author(s):  
Xianqiao Hu ◽  
Zhaoyun Cao ◽  
Weihua Sun ◽  
Huan Yang ◽  
Ping Xu ◽  
...  
Keyword(s):  
Accurate Determination ◽  
Food Samples ◽  
Mass Shift ◽  
Plant Food ◽  
Doubly Charged Ions ◽  
Icp Ms ◽  
Doubly Charged ◽  
Charged Ions

In this paper, the influence of polyatomic and doubly charged ions on determination of As and Se was evaluated in four different modes. It was found that O2 mass-shift mode was an effective method to remove all interferences.

scholarly journals Formation and fragmentation of doubly and triply charged ions in the negative ion spectra of neutral N-glycans from viral and other glycoproteins

2021 ◽  
Author(s):  
David J. Harvey ◽  
Weston B. Struwe ◽  
Anna-Janina Behrens ◽  
Snezana Vasiljevic ◽  
Max Crispin
Keyword(s):  
Detailed Comparison ◽  
Negative Ion ◽  
Doubly Charged Ions ◽  
Multiply Charged ◽  
Structural Details ◽  
Different Types ◽  
Doubly Charged ◽  
Ion Collision ◽  
Charged Ions

AbstractStructural determination of N-glycans by mass spectrometry is ideally performed by negative ion collision-induced dissociation because the spectra are dominated by cross-ring fragments leading to ions that reveal structural details not available by many other methods. Most glycans form [M – H]- or [M + adduct]- ions but larger ones (above approx. m/z 2000) typically form doubly charged ions. Differences have been reported between the fragmentation of singly and doubly charged ions but a detailed comparison does not appear to have been reported. In addition to [M + adduct]- ions (this paper uses phosphate as the adduct) other doubly, triply, and quadruply charged ions of composition [Mn + (H2PO4)n]n- have been observed in mixtures of N-glycans released from viral and other glycoproteins. This paper explores the formation and fragmentation of these different types of multiply charged ions with particular reference to the presence of diagnostic fragments in the CID spectra and comments on how these ions can be used to characterize these glycans. Graphical abstract

Investigation of Experimental Parameters with a Quadrupole ICP/MS

1987 ◽  
Vol 41 (3) ◽  
pp. 349-359 ◽  
Author(s):  
Guangxuan Zhu ◽  
Richard F. Browner
Keyword(s):  
Rf Plasma ◽  
Operating Parameters ◽  
Icp Oes ◽  
Sampling Depth ◽  
Doubly Charged Ions ◽  
Icp Ms ◽  
Experimental Parameters ◽  
Singly Charged ◽  
Doubly Charged ◽  
Charged Ions

Preliminary studies have shown that signal behavior in ICP/MS is quite different from that in ICP-OES. This is particularly true for the manner in which ICP operating parameters affect the responses of elements detected, and results from behavior occurring both in the interface and in the mass spectrometer. This paper describes in detail the response of a commercially available instrument (VG PlasmaQuad) to variations in several important operating parameters. The effects of nebulizer flow rate, rf plasma power, and sampling depth on ion populations, on ratios of singly charged to doubly charged ions, and on singly charged ions to oxide and hydroxide ions are described for selected elements. A comparison is also made of the results obtained with the present instrument, with data published from other commercial instrumentation.

REACTIONS OF DOUBLY CHARGED IONS WITH VARIOUS NEUTRALS

1979 ◽  
Vol 40 (C7) ◽  
pp. C7-21-C7-22
Author(s):  
K. Peska ◽  
E. Alge ◽  
H. Villinger ◽  
H. Störi ◽  
W. Lindinger
Keyword(s):  
Doubly Charged Ions ◽  
Doubly Charged ◽  
Charged Ions

Triatomic molecules

2018 ◽  
Author(s):  
John H. D. Eland ◽  
Raimund Feifel
Keyword(s):  
Degrees Of Freedom ◽  
Normal Modes ◽  
Electronic States ◽  
Triatomic Molecules ◽  
Doubly Charged Ions ◽  
Spectral Bands ◽  
Valence Electrons ◽  
Doubly Charged ◽  
Charged Ions ◽  
Double Ionisation

Double ionisation of the triatomic molecules presented in this chapter shows an added degree of complexity. Besides potentially having many more electrons, they have three vibrational degrees of freedom (three normal modes) instead of the single one in a diatomic molecule. For asymmetric and bent triatomic molecules multiple modes can be excited, so the spectral bands may be congested in all forms of electronic spectra, including double ionisation. Double photoionisation spectra of H2O, H2S, HCN, CO2, N2O, OCS, CS2, BrCN, ICN, HgCl2, NO2, and SO2 are presented with analysis to identify the electronic states of the doubly charged ions. The order of the molecules in this chapter is set first by the number of valence electrons, then by the molecular weight.

Doubly-charged ions in desorption mass spectrometry

1983 ◽  
Vol 55 (8) ◽  
pp. 1310-1313 ◽  
Author(s):  
David N. Heller ◽  
James. Yergey ◽  
Robert J. Cotter
Keyword(s):  
Mass Spectrometry ◽  
Desorption Mass Spectrometry ◽  
Doubly Charged Ions ◽  
Doubly Charged ◽  
Charged Ions
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