Determination of ultratrace nitrogen in pure argon gas by dielectric barrier discharge-molecular emission spectrometry

Headspace Solid-Phase Microextraction Following Chemical Vapor Generation for Ultrasensitive, Matrix Effect-Free Detection of Nitrite by Microplasma Optical Emission Spectrometry

“…As shown in Figure 2a,b, a series of typical NO (205.3, 226.9, 237.0, and 247.9 nm) and N 2 (337.1, 357.7, 380.5, and 405.3 nm) emission bands could be clearly observed in both the background and standard solution emission spectra. According to a previous work, 42 Ar discharge gas usually contains a high concentration of nitrogen impurities, thus resulting in a high blank value. Although this method can be used for the detection of nitrite in complex matrices samples, the high background seriously limits the analytical performance.…”

“…Although CVG coupling to MP has been successfully used to determine nitrite via monitoring the molecular emission of NO, the nitrogen contained in discharge gas resulted in a high blank, thus deteriorating the analytical performance. 41,42 Recently, Chai et al reported that sodium cyclamate was specifically converted to volatile cyclohexene in the presence of nitrite. 12,43,44 On the basis of this phenomenon, herein, a simple CVG method coupling headspace solid-phase microextraction point discharge optical emission spectrometry (HS-SPME−μPD-OES) was developed for the highly sensitive determination of nitrite in complex samples.…”

“…) − to nonmetallic analytes (total organic carbon, NH 3 , NO 3 – , NO 2 – , and carboxyl group) − when chemical vapor generation (CVG) was used as a sample introduction means. Although CVG coupling to MP has been successfully used to determine nitrite via monitoring the molecular emission of NO, the nitrogen contained in discharge gas resulted in a high blank, thus deteriorating the analytical performance. , …”

Alternating-Current-Driven Microplasma for Multielement Excitation and Determination by Optical-Emission Spectrometry

“…In order to make up the deficiency of the limited excitation capability of microplasma itself, the employment of a well-matched sampling approach is essential for improving the detection sensitivity of nonthermal OES systems. Initially, various gaseous species can be directly introduced into the microplasma for excitation and OES detection . Various species in aqueous media should be volatilized as “pure” and “dry” species for their excitation and detection by the microplasma–OES system, such as with chemical-vapor generation ,,,− or electrothermal vaporization, − in order to avoid concomitant products and residual moisture.…”

“…Initially, various gaseous species can be directly introduced into the microplasma for excitation and OES detection. 18 Various species in aqueous media should be volatilized as "pure" and "dry" species for their excitation and detection by the microplasma−OES system, 19 such as with chemical-vapor generation 7,10,11,20−22 or electrothermal vaporization, 23−27 in order to avoid concomitant products and residual moisture. Although gaseous introduction avoids the decrease in the excitation capability or even the extinguishing of microplasma resulting from the presence of a large amount of water molecules, the multielement-analysis capability of OES itself has to be highly dependent on the gaseous species produced or the electrothermal-vaporization device.…”