Determination of Tetraethyllead in Gasoline by X-Ray Absorptiometry

Abstract

The results obtained in an investigation of x-ray absorptiometry as a method for the determination of tetraethyllead in gasoline are described. The sensitivity of the absorbance measurements to voltage fluctuations made it imperative to be able to adjust and maintain the primary voltage constant to ±0.10 volt. The refinements necessary to obtain this voltage constancy are given, ap well as other modifications made to the General Electric x-ray

X-Ray Absorption Spectrometry for Determination of Tetraethyllead in Gasoline

“…PM'blend = p(P + Q f s) (8) It is seen from Figure 14 that the experimental results do yield essentially a straight-line relationship, thereby indicating that the effects of sulfur and carbon-to-hydrogen ratio upon this oneline method are as predicted by their elemental absorption coefficients. Incidentally, Figure 14 shows that an analysis for sulfur may be made when the carbon-to-hydrogen ratio is known (or approximated) and when metals, halogens, etc., are absent.…”

“…to increase the sensitivity. More recently, the General Electric Company has put on the market an x-ray spectrophotometer (8,11,16,18,(25)(26)(27). It operates on white radiation from tungsten and attempts to reduce the large effects of voltage fluctuations by the use of a split beam.…”

Determination of Tetraethyllead in Gasoline by Titration with Ethylenediamine Tetraacetate

“…By Titration with Ethylenediamine Tetraacetate O. I. MILNER and G. F. SHIPMAN Research and Development Department, Socony-Vacuum Laboratories, Paulsboro, N. J. SOME widely used methods for the determination of tetraethyllead in gasoline are the ASTM method (1), and polarographic (2, 14) or x-ray (6,11) procedures. In the ASTM procedure, the lead is extracted with concentrated hydrochloric acid and determined gravimetrically as lead chromate.…”

Flame Photometric Determination of Lead and Manganese in Gasoline

“…Methods employing x-ray absorption, x-ray fluorescence, polarographic, and flame photometric techniques have been reported. X-ray absorption methods are complicated by sulfur interference (4). X-ray fluorescence methods are fast and accurate but require expensive equipment (70).…”