Microwave-driven inductively coupled plasmas for analytical spectroscopy
Jacek Giersz , Krzysztof Jankowski , Andrzej Ramsza , Edward Reszke
AbstractNew achievements in microwave-driven inductively coupled plasma (ICP) technology based on formation of homogeneous H-type field inside the plasma discharge tube by using both multi-helix and partial-turn couplers are discussed in detail. These couplers range from separate washers delivering longitudinal Ez and radial Er field components concentrated at the inner wall of the torch, through real multi-turn field shapers, which make the prevailing longitudinal Hz or hybrid EH field components, all the way to strait wires delivering a single radial Er field component with minimum at the axis. Two novel approaches utilizing either a ring washer coupler or a multi helix coupler are developed to generating atmospheric pressure annular-shaped microwave ICPs, suitable for analytical spectroscopy. They are stably operated with argon or helium at 1–2 L min−1 flow rates at a power level of 300W while accepting up to 70 mg min−1 of water aerosol. For argon plasmas, rotational temperatures of OH (3300–4200 K) and electron number densities (1.9–2.2)×1015 cm−3 are close to those measured in Ar ICP. Limits of detection for some metals were within the range of 0.006–0.035 mg L−1 using a portable OES detection system.
|Journal series||Spectrochimica Acta Part B-Atomic Spectroscopy, ISSN 0584-8547, (A 35 pkt)|
|Publication size in sheets||0.5|
|Keywords in English||Annular-shaped microwave plasma, Microwave-driven inductively coupled plasma, Analytical spectroscopy|
|ASJC Classification||; ; ;|
|Score||= 35.0, 23-09-2019, ArticleFromJournal|
|Publication indicators||= 1; : 2017 = 1.408; : 2017 = 2.854 (2) - 2017=3.015 (5)|
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