Plasma pencil as an excitation source for atomic emission spectrometry

Abstract

A 13.56 MHz plasma jet discharge, called a plasma pencil, was investigated. Rotational and excitation temperatures, and electron number densities for the pencil under and without sample load were calculated using OH band spectra, Ar lines and Hb line, respectively. The rotational temperatures were found to be relatively low at about 800 K, however, excitation temperatures exceeded 4000 K. The plasma was found to be strongly non-isothermal. Some atomic lines of elements were easily observed. Aqueous solution-based aerosols were incorporated into the plasma without desolvation. Standard water solutions of the elements were nebulized into the plasma. The Ar carrier gas and Ar plasma gas flow rates were 0.3 and 4.0 l min À1 , respectively. The forwarded power was 140 W. Intensities of the atomic lines, temperatures and electron number densities along the discharge tube were acquired in different positions from the aerosol entrance and an optimal position providing the best signal-to-noise ratio for each line intensity was established. Calibration dependencies for Ca, Cu, Mg, Zn, Li, Na were measured in the rage of 1-100 mg l À1 . 3-sigma detection limits in the best observation axial position were (mg l À1 ): 27 (Ca), 49 (Cu), 58 (Mg), 40 (Li), 13 (Na) and 180 (Zn).

Dielectric barrier discharge plasma atomizer for hydride generation atomic absorption spectrometry—Performance evaluation for selenium

“…As such, DBD devices of different designs can be coupled to atomic absorption/fluorescence detectors as well as combined with optical emission spectrometry [2][3][4][5][6][7][8][9] and ambient mass spectrometry [10][11][12][13][14].…”

Effects of easily ionisable elements on copper and zinc lines excited in a plasma pencil

“…The experimental arrangement was the same as in our previous work. 5,6 The scheme is depicted in Fig. 1.…”

“…Copper and zinc were chosen because their excitation was well monitored in our previous studies, 5,6 and they are the only elements not belonging to EIE in the element set investigated using our plasma pencil. Their molar mass is also very similar and therefore, the differences in the molar concentrations of their solutions are negligible.…”

Atomic spectrometry update: review of advances in atomic spectrometry and related techniques

“…Civis et al 108 have determined the transitions and oscillator strengths for Na(I) spectra in the A long standing favourite is the spectroscopic measurement of the temperatures which characterise a particular plasma discharge, typically T rot , T exc , T ion and n e . Novosad et al 109 have investigated a 13.56 MHz plasma jet discharge operated at argon flow rates of between The properties of the ICP-MS interface has also attracted the interest of several workers. Aghaei et al 114 have studied the effects of the MS interface on ICP characteristics in ICP-MS using a computational model, which predicted a dramatic increase in the plasma velocity close to the interface.…”