The Characteristics and Operation Parameters of a Thermionic Emission Detector, Selective and Sensitive to Phosphorus

Residue Reviews / Rückstands-Berichte

“…They stressed the importance of c1eaning the container top with solvent, before opening, to remove materials such as lacquers and solder flux. BECKMAN and GAUER (1966) reported finding a single interfering peak orig-inating in glass storage containers capped with plastic lined caps. The gas chromatographie response that demonstrates this contaminant is shown in Figure 4.…”

“…By using two electrometers and recorders, the upper and lower Hames may be monitored simultaneously to afford a standard Hame-ionization chromatogram and one for the thermionic detector as well as for differential diagnoses of identity of measured species. BECKMAN and GAUER (1966) have reported the constmction and application to pesticide residue analysis of a sodium Hame-ionization detector patterned after that of GIUFFRIDA (1964) and report that relatively longterm stability and good sensitivity can be obtained but önly with critical electrode placement and careful gas-flow control. COAHRAN (1966), however, experienced large changes in sensitivity within a few hours with the GIUFElUDA detector due to rapid loss of the salt from the electrode and developed what is claimed to be a much more stable system by placing a ceramic tube around the burner tip, forming a cup in which is placed granular sodium sulfate.…”

“…Considerable variation in purity has been found from batch to batch of a solvent from one supplier as well as from different suppliers. BECKMAN and GAUER ( 1966) suggested, in their studies of solvent purification for gas-liquid chromatography (glc) with electron-capture detection, that initial solvent purity would probably be considerably improved if initially good quality metal containers could be repeatedly filled with the same solvent by the rnanufacturer instead of their continually filling new drums. Transfer of solvents from large storage containers to smaller containers can be a source of introduced contamination if care is not taken.…”