N-, O- and P-selective on-column atomic emission detection in capillary gas chromatography

Easy hyphenation of supercritical-fluid chromatography to atomic-emission detection for analysis of lubricant additives

“…In contrast, Figure 4B shows that hydrogen had little effect on C1 and CN signal intensities. In a manner similar to the reported effect of adding oxygen to the plasma in GC-AED [28], free oxygen atoms generated by fragmentation of carbon dioxide can encourage the formation of oxides of phosphorus and the interaction of these with the wall of the cavity when hydrogen is not added. As a result, hydrogen (pressure >34 psig) was added continuously during subsequent experiments.…”

“…In GC-AED, scavenger gases such as oxygen or hydrogen are usually added to the plasma to maintain peak shape and to compensate for element deposition in the discharge tube [28]. For phosphorus detection, tailing and 'spiking' of the elution peak and different retention times for the AED and UV traces were observed when no scavenger gas was used ( Figure 4A).…”

Determination of brominated alkylbenzenes in nickel industry sludge by capillary gas chromatography

“…x 0.17 ~tm HP-5 (95 % dimethyl 5 % diphenyl polysiloxane) fused silica capillary column (Hewlett-Packard, Wilmington, DE, USA). The home-built on-column plasma emission detector, which was based on a 350 kHz radio frequency discharge, has been described in detail elsewhere [10,13,14]. The plasma was generated inside the end of the 0.32 mm I.D.…”

Determination of non-metals in organic compounds by gas chromatography with a miniature capacitively coupled plasma emission detector

“…7,8 A different approach to micro-miniaturization was adopted by Pedersen-Bjergaard and Greibrokk, who designed a radiofrequency based detector with a plasma created directly inside the end of the separation capillary and reported the detection of a number of elements in organic compounds. [9][10][11][12] In our group a slightly different on-column detector was recently reported which relies on two tubular electrodes external to the separation capillary for capacitive coupling of a low frequency (20 kHz), but high voltage (20 kV), field, with approximately 8 W of electrical power. 13 The plasma can be supported in atmospheric pressure at a range of flow rates directly suitable for most capillary chromatographic methods, without having to add an auxiliary gas stream.…”