Octopole Reaction Cell Research Articles

Determination of arsenite, arsenate, and monomethylarsonic acid in seawater by ion-exclusion chromatography combined with inductively coupled plasma mass spectrometry using reaction cell and hydride generation techniques

This paper describes a robust and sensitive method for the determination of arsenic species in seawater by ion-exclusion liquid chromatography (LC) combined with inductively coupled plasma mass spectrometry (ICP-MS) using reaction cell and hydride generation (HG) techniques. A good separation of arsenite, arsenate, and monomethylarsonic acid was achieved using an ion-exclusion column packed with a sulfonated polystyrene resin and a dilute nitric acid at pH 2.0 as the eluent, even when a large volume, i.e. 200 μl, of seawater samples containing a large amount of matrix was repeatedly injected. Separations of the chloride ion due to the matrix and arsenic species were partially performed; however, the extensive peak of ArCl due to high content of Cl − in a sample overlapped peaks of the three arsenic species on 75As measurement by ICP-MS. This ArCl polyatomic interference was efficiently eliminated by collision of ArCl molecules with helium in an octopole reaction cell which was introduced prior to a mass spectrometer. Detection limits of the three arsenic species in a sample containing 2% Cl −, the concentration of which is comparable to that in a seawater sample, by LC–ICP-MS with the octopole reaction system (ORS), ranged from 21 to 25 pg As ml −1; these values were three–six times lower than those by LC–ICP-MS without ORS. As another technique for ArCl interference elimination, HG prior to ICP-MS was also successfully used not only to reduce the interference but also to improve the detection limits to 3.4–4.5 pg As ml −1. The developed LC–ICP–ORS–MS and LC–HG–ICP-MS were validated by analyzing a certified reference material (CRM) of seawater. In addition, no serious decrease in analytical performance of present methods was observed in the experimental periods of half a year for LC–ICP–ORS–MS and 1 year for LC–HG–ICP-MS, respectively. The latter method was successfully applied to characterize seasonal variations of three arsenic species in deep seawater and surface seawater.

Analysis of diluted sea-water at the ng L−1level using an ICP-MS with an octopole reaction cell

Download options Please wait... Article information DOI https://doi.org/10.1039/B110180N Article type Paper Submitted 07 Nov 2001 Accepted 22 Jan 2002 First published 18 Feb 2002 Download Citation J. Anal. At. Spectrom., 2002,17, 189-196 BibTex EndNote MEDLINE ProCite ReferenceManager RefWorks RIS Permissions Request permissions Analysis of diluted sea-water at the ng L−1 level using an ICP-MS with an octopole reaction cell P. Leonhard, R. Pepelnik, A. Prange, N. Yamada and T. Yamada, J. Anal. At. Spectrom., 2002, 17, 189 DOI: 10.1039/B110180N To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page. If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given. If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page. Read more about how to correctly acknowledge RSC content. Social activity Tweet Share Search articles by author Peter Leonhard Rudolf Pepelnik Andreas Prange Noriyuki Yamada Tomoyuki Yamada

A vibrational state-selected study of the reaction H+2(v′0)+H2(v′′0=0)→H+3+H using the tandem photoionization mass spectrometry and radio frequency ion guide methods

A new ion–molecule rection apparatus, which consists of a photoionization source, a tandem mass spectrometer, and a radio frequency octopole reaction cell is described. Using a quadrupole mass filter to reject H+3 background ions formed at the photoionization source, absolute total cross sections for the reaction H+2 (v′0) +H2 (v′0 =0)→H+3 +H, have been measured as a function of the vibrational state of reactant H+2, where v′0 =0–4, over the center-of-mass collision energy (Ec.m.) range of 0.04–15 eV. The experimental results are compared with phenomenological cross sections obtained in previous single gas cell studies, the quasiclassical trajectory calculations of Stine and Muckerman, and the recent similar calculations of Eaker and Schatz. The absolute total cross sections measured for v0 =0 and 3 at Ec.m. =0.5, 1, 3, and 5 eV are found to be in agreement with ‘‘trajectory surface hopping’’ calculations which include nonadiabatic surface hopping throughout the reaction.