Determination of methyl ethyl lead alkyls and halide scavengers in gasoline by gas chromatography and flame ionization detection

Determination of tetraalkyllead compounds in gasoline by liquid chromatography-atomic absorption spectrometry

“…Parker et al (6) initially sepa- 1 Present address: U.S. Geological Survey, 923 National Center, Reston, VA 22092. rated all five TAL compounds by isothermal gas chromatography (GC), collected them individually in methanolic iodide scrubbers as they eluted from the column, and then measured the total lead content in each fraction by a dithizone spectrophotometric procedure. This lengthy and complex procedure was improved by gas chromatographic techniques which incorporated on-line electron capture (7)(8)(9), catalytic hydrogenation prederivatization flame ionization (10)(11)(12), and hot-wire thermal conductivity (12) detection systems. However, interferences due to coeluting gasoline matrix constituents frequently plaqued the unambiguous detection of all five TAL compounds using such coventional detectors.…”