Behavior of several lead compounds in organic medium with a hydride generator. Direct determination of lead in gasoline
A study was carried out with atomic absorption spectrometry (AAS), using a silica tube, to determine whether lead hydride could be generated in organic medium, using solvents N,N-dimethylformamide, formamide, and dimethyl sulfoxide. Pb(NO/sub 3/)/sub 2/ was used as standard of Pb(II) and PbO/sub 2/, Pb(C/sub 2/H/sub 3/O/sub 2/)/sub 4/, and PbR/sub 4/ (where R = CH/sub 3/ or C/sub 2/H/sub 5/) were used as standards for Pb(IV). It was found that even with wide ranges of NaBH/sub 4/ concentrations, type and concentration of the acid medium, and various oxidants, no plumbane is generated. However, the hydrogen given out in the decomposition of NaBH/sub 4/ carries the tetraalkyl compound to the silica tube. This tetraalkyl compound can be carried to the silica tube by CO/sub 2/, generated in situ by adding NaHCO/sub 3/ in acid medium, instead of using NaBH/sub 4/. This permits the determination of volatile organometallic lead. The optimal conditions for direct volatilization of PbR/sub 4/, delivery to the silica tube, and AAS measurement were determined. The detection limit was found to be 17 ppb of Pb in a 20-ml sample. The relative standard deviation is 2.31%. Pb was directly determined in several gasoline samples.
- Research Organization:
- Universidad de Zaragoza, Spain
- OSTI ID:
- 6292552
- Journal Information:
- Anal. Chem.; (United States), Vol. 59:15
- Country of Publication:
- United States
- Language:
- English
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ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
02 PETROLEUM
GASOLINE
QUANTITATIVE CHEMICAL ANALYSIS
LEAD
ABSORPTION SPECTROSCOPY
LEAD COMPOUNDS
CHEMICAL REACTIONS
ORGANIC SOLVENTS
ORGANOMETALLIC COMPOUNDS
EXPERIMENTAL DATA
FUEL ADDITIVES
HYDRIDES
TRACE AMOUNTS
ADDITIVES
CHEMICAL ANALYSIS
DATA
ELEMENTS
FUELS
HYDROGEN COMPOUNDS
INFORMATION
LIQUID FUELS
METALS
NUMERICAL DATA
ORGANIC COMPOUNDS
PETROLEUM PRODUCTS
SOLVENTS
SPECTROSCOPY
400102* - Chemical & Spectral Procedures
023000 - Petroleum- Properties & Composition