HR: 0800h
AN: V51C-0600    [Abstracts]
TI: Increasing the Linear Dynamic Detection Range of High Resolution ICPMS
AU: * Rottmann, L
EM: Lothar.Rottmann@thermo.com
AF: Thermo Electron, Barkhausenstrasse 2, Bremen, 28197 Germany
AU: Hamester, M
EM: Meike.Hamester@thermo.com
AF: Thermo Electron, Barkhausenstrasse 2, Bremen, 28197 Germany
AU: Wills, J
EM: Julian.Wills@thermo.com
AF: Thermo Electron, Barkhausenstrasse 2, Bremen, 28197 Germany
AU: Douthitt, C B
EM: thermochuck@starband.net
AF: Thermo Electron, Barkhausenstrasse 2, Bremen, 28197 Germany
AB: High resolution ICPMS (HR-ICPMS) is widely used in geochemistry for interference-free multielement determinations in complex sample matrices and measurement of precise isotope and elemental ratios at low concentrations, and as a detector for laser ablation analysis. The linear dynamic detection range is of immense importance in ICPMS because of the wide range of elements and concentrations to be analyzed in a single analysis, and particularly so for analysis of laser ablation pulses. HR-ICPMS systems have typically used a discrete dynode detector with a linear dynamic range of 8-9 orders of magnitude which is, in general, not sufficient for quantitation of both matrix elements and ultra-trace elements in a single analysis. To overcome this limitation, we have developed a new detector system for the Finnigan ELEMENT2 HR-ICPMS which incorporates 3 modes of operation which span a linear dynamic range of 12 orders of magnitude. The new detector system has, in addition to the discrete dynode detector with analog and ion counting modes, a Faraday detector, with automatic ion signal-dependent switching between the three detection modes. The new electronics of fast detection system have a minimum dwell time of 1 ms, allowing analysis of transient signals. The presentation will describe the technical concept and the operation of the new "triple mode detector" and demonstrate its capability for laser ablation-HR-ICPMS analysis of matrix and ultra-trace elements in a single analysis.
DE: 8494 Instruments and techniques
DE: 9805 Instruments useful in three or more fields
DE: 9820 Techniques applicable in three or more fields
SC: Volcanology, Geochemistry, Petrology [V]
MN: 2004 AGU Fall Meeting