Abstract
Abstract To obtain a reliable alkali-flame detector with a rubidium sulfate source, commercial detection systems were modified. Improvements were made in Barber-Colman Model 5121 FID and Varian Aerograph Model 1200 FID systems to decrease operational difficulties and detection inadequacies. Equipped with a rubidium sulfate alkali source and an adjustable platinum anode, the modified Barber- Colman FID was used to study the phosphorus response of various regions in the flame. Flame configuration, affected by flow rates of gases, influences not only the absolute response level but also the response profile as a function of the anode height. Consequently, the region of maximum response was altered markedly by the flame configuration. The region of the flame with maximum ion population is located within the area immediately surrounding the outside of the flame rather than in the flame.
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