Characteristics of a resonant iris microwave-induced nitrogen plasma

Abstract

Temperature, electron number density and robustness profiles of a N2 plasma contribute for more sensitive and accurate MIP OES determinations.

The 2017 Plasma Roadmap: Low temperature plasma science and technology

“…Further, because RF supplies are bulky and inefficient and argon flows are substanti al and costly, alternatives to the ICP are being sought. Some employ microwave magnetrons for power and are sustained in nitrogen or air [145]; commercial versions of such systems have already appeared. Other designs avoid gas flows and complex sample-introduction devices altogether, by operating directly on the surface of a flowing sample solution.…”

Elemental Analysis of Human Blood Serum by Microwave Plasma—Investigation of the Matrix Effects Caused by Sodium Using Model Solutions

“…Since it was already described that in the wavelength region of 280 and 285 nm the response is increasing relatively slow, a factor of 1.15 must be used to multiply with the intensity ratio data of ionic to atomic lines for Mg [48,49]. The results of the present study are demonstrated after the correction.…”

Signal correction using molecular species to improve biodiesel analysis by microwave-induced plasma optical emission spectrometry

“…Depending on the plasma gas, its impurities, and the constitution of the analytical solution, intense emission band heads can be observed for OH, NH, N 2 , N 2 + , CN, among other gas species [23][24][25]. As discussed before, the introduction of complex matrix samples into the plasma can significantly change its constitution, temperature, and/or electron number density, which results in poor accuracy [13,14,19]. In the present work, we hypothesize that some of MIP's naturally occurring molecular species could be used to probe plasma fluctuations and then correct analytical signals to improve accuracy.…”

“…It is also less prone to matrix effects than FAAS and FAES because of its significantly higher temperatures when compared to a nitrous oxide flame [18,19]. On the other hand, the N 2 MIP is less robust and has a lower temperature than an Ar ICP [19,20]. We evaluate the use of naturally occurring molecular species in the N 2 MIP to correct for plasma composition changes during the introduction of biodiesel samples.…”

“…The N 2 plasma used in MIP OES is more tolerant to organic solvents and high carbon-content samples than an Ar ICP OES [16,17]. It is also less prone to matrix effects than FAAS and FAES because of its significantly higher temperatures when compared to a nitrous oxide flame [18,19]. On the other hand, the N 2 MIP is less robust and has a lower temperature than an Ar ICP [19,20].…”