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How much aqueous sample can an inductively coupled plasma withstand?

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Abstract

During this study, a compact infrared-heated sample introduction system at 200 °C or 280 °C, consisting of a modified cyclonic spray chamber with a ceramic rod heater within a baffle at its centre and a ceramic rope heater wrapped around the base of the torch, was operated at sample uptake rates of 100, 150, 200, 250 and 300 μL min−1 in ICP optical emission spectrometry. The plasma never extinguished although it flickered at 200 and 250 μL min−1. At 280 °C, no drainage occurred up to 250 μL min−1, indicating total consumption. This is more than double the highest sample uptake rate previously used for total sample introduction. Sensitivity was similar or improved compared to that obtained with a baffled cyclonic spray chamber at room temperature but operating at 1 mL min−1. Plasma robustness, assessed using the Mg II 280.270/Mg I 285.213 nm signal ratio, of at least 8 was achieved at 100 and 150 μL min−1, at 200 °C, and at 100 μL min−1, at 280 °C, but degraded to 7 and 3 at 250 μL min−1, at 200 °C and 280 °C, respectively. The detection limit for all sample uptake rates at 280 °C was better than that obtained at 200 °C and than that with a baffled cyclonic spray chamber at room temperature. Although the precision at 280 °C was better than that obtained at 200 °C, it was generally degraded because a single set of ICP operating conditions, established with the reference system, was used in all cases. Hence, re-optimization of ICP operating conditions should enable total sample consumption at up to 250 μL min−1 with improved sensitivity as well as similar or improved detection limits, precision and plasma robustness.

Graphical abstract: How much aqueous sample can an inductively coupled plasma withstand?

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Article information


Submitted
22 Feb 2020
Accepted
17 Apr 2020
First published
17 Apr 2020

J. Anal. At. Spectrom., 2020, Advance Article
Article type
Technical Note

How much aqueous sample can an inductively coupled plasma withstand?

A. Al Hejami, J. Burgener, M. J. Burgener and D. Beauchemin, J. Anal. At. Spectrom., 2020, Advance Article , DOI: 10.1039/D0JA00070A

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