A Metal Selective Microwave Emissive Detector for Gas Chromatography

Atmospheric pressure helium microwave detection system for gas chromatography

“…Since many N-nitroso compunds are known to be potent carcinogens in animals (1, 2), there has been a great deal of concern as to the extent of their occurrence in the environment (3)(4)(5). It has been estimated (6) that the "tolerable" exposure levels for the more volatile N-nitrosamines in man are as low as 5-10 Ag/kg (ppb).…”

Gas chromatograph-microwave plasma detector for the determination of tetraalkyllead species in the atmosphere

“…The use of a microwave plasma detector (MPD) in conjunction with GC was first applied to organic pesticide analysis (16). Since then the GC-MPD system has been used in the analysis of organic Hg (17,18), metal chelates (19,20), alkyl As acids in environmental samples (21), As and Sb in environmental samples (22), and total Se (23). It is necessary to maintain a low level of atoms within the plasma to ensure stability.…”

Direct current atmospheric pressure argon plasma emission echelle spectrometer as a specific metal gas chromatographic detector

“…The microwave plasma discharge (MPD) offers similar advantages and disadvantages to the flame photometric detector but eliminates the need to optimize a flame system. Problems occur due to depositing carbon from solvents on the quartz emission tube, and eluting solvent may extinguish the plasma (13)(14)(15)(16)(17). Oxygen scavenger gas may be added to reduce carbon deposits; the effect of this on emission characteristics has been studied.…”