Spectroscopic evaluation of a low power atmospheric pressure mixed argon–helium microwave induced plasma combined with the chemical generation of volatile species for the optical emission spectrometric determination of arsenic, antimony and mercury

Abstract

Spectroscopic and analytical characteristics of a low power atmospheric pressure mixed argon-helium microwave induced plasma were examined for its usefulness in the determination of As, Sb and Hg by optical emission spectrometry and using a continuous flow chemical vapor generation of these elements (AsH 3 , SbH 3 , Hg 0 ) in the reaction with sodium tetrahydroborate. The effect of the concentration of helium in the plasma gas on excitation, vibrational and rotational temperatures and the electron number density in the discharge obtained from argon and mixtures of argon with helium was studied to evaluate changes in excitation conditions and their impact on the analytical performance of the plasma. It was found that the presence of 10-20% v/v of helium in the carrier/plasma gas is very convenient for the excitation of As, Sb and Hg introduced to the plasma via the volatile species generation reaction. In reference to limits of detection of 4.1 (As), 1.8 (Sb) and 1.4 (Hg) ng ml À1 , such a plasma has a considerably better analytical performance as compared to the plasma generated only in an argon atmosphere.

Direct Current Atmospheric Pressure Microdischarge Generated between a Miniature Flow Helium Microjet and a Flowing Liquid Cathode

“…Rotational ( T rot ) and vibrational ( T vib ) temperatures of OH and N 2 molecules were determined by fitting experimental spectra with simulated diatomic emission spectra. Computer programs Lifbase and Specair were applied to simulate emission spectra of the OH(A–X) system and the N 2 (C–B) at different rotational and vibrational temperatures .…”

Cold Atmospheric Plasma Attenuates Breast Cancer Cell Growth Through Regulation of Cell Microenvironment Effectors

“…Mainly, emission peaks originating from the N 2 second positive system (N 2 SPS) in the range 315-405 nm, the N 2 first positive system (N 2 FPS) between 500 and 900 nm, and at 393 and 427 nm were observed ( 27 ). Furthermore, OH radical emissions (309 nm) ( 32 ) which is a strong oxidant and precursor for H 2 O 2 production, NO gamma emission lines in the range 230-260 nm ( 33 ), atomic oxygen (O) line at 777 and 844 nm, and line at 527 nm were detected ( 34 ).…”

Sono-induced cold vapour generation interfaced with capacitively coupled plasma microtorch optical emission spectrometry: analytical characterization and comparison with atomic fluorescence spectrometry

“…[18][19][20] The analytical capability of various microplasma sources was demonstrated for the simultaneous multielemental analysis of liquid microsamples, simultaneous determination of As and Sb aer hydride generation or Hg quantication following CV generation. [21][22][23][24][25][26][27][28][29][30][31][32][33][34][35] Until now, the possibility of coupling the sono or UV promoted CV generation with a microplasma/microtorch for mercury determination has not been investigated. Thus, the aim of the present study was to investigate for the rst time the capability and usefulness of sono-induced cold vapour generation combined with capacitively coupled plasma microtorch optical emission spectrometry (SICV-mCCP-OES) for Hg determination.…”