Abstract
The influence of Easily Ionizable Elements (EIE) (chlorides of Na, K, Mg, Ca, Sr and Ba) on the measured spectral lines intensities of copper and zinc excited in a capacitively coupled tubular discharge, known as a plasma pencil, is described.
Highlights
Plasma pencil is a capacitively coupled plasma (CCP) radiofrequency jet discharge, operated typically in argon, at atmospheric pressure.[1]
Substantial Easily Ionizable Elements (EIE) suppression effects were proved for laser ablation (LA)-ICPMS, e.g. with Rb introduced into the ICP a er de-solvation of the original Rb single element solution to exclude the in uence of water.[15]
There is no exact theoretical reason, we proposed an empirical formula describing the magnitude of X for the local maximum, which could be attributable to the ionization buffering and was observable at lower EIE concentrations (Fig. 3a–d): X 1⁄4 1 À (Eul À EiEIE)/EiEIE
Summary
Effects of ionisable elements on copper and zinc lines excited in a plasma pencil Magda Dvorakova,a Ales Hrdlicka,*ab Pavel Slavıcek,c Viktor Kanickyab and Vıtezslav Otrubaa. The influence of Ionizable Elements (EIE) (chlorides of Na, K, Mg, Ca, Sr and Ba) on the measured spectral lines intensities of copper and zinc excited in a capacitively coupled tubular discharge, known as a plasma pencil, is described. Addition of NaCl, KCl or BaCl2 causes a steep decrease of the copper or zinc signal for a relatively narrow range of 0.05–0.80 g lÀ1. Other EIE, with relatively higher ionization energies, even caused an increase of the Cu I 324.754, 327.396, 510.554 and 578.213 nm and Zn I 213.856, 468.014, 472.216 and 481.053 nm signals. Atoms of Na, K and Ba are so much ionized that Cu and Zn atoms even loose energy for their excitation. The influence of the EIE on the plasma properties was monitored by calculation of excitation (2900 Æ 280) K, rotational temperatures (1000 Æ 160) K and electron number density of (4.6 Æ 0.7) Â 1019 mÀ3; but no significant change was observable
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