health and safety plan solid waste management unit assessment

AUTOMOTIVE GASOLINE 65-34
even the consd.tuents themselves, will vary with time and distance from
the site of initial contamination due to weathering. The major
component categories in automotive gasoline h8Ve been identified as the
following:
n-alkanes
branched alkanes
.cycloalkanes
benzene and alkylbenzenes
naphthalenes
A combinrrtion of capillary column gas chromatography (CC) and gas
chromatography/mass spectrometry (CC/MS) techniques may be used to
identify the principal components in automotive gasoline. Fuel
samples, and probably any samples collected in the field which are
primarily organic in nature, may require the separation (prior to GC or
GC/MS analysis) of the aliphatic, monoaromatic and polycyclic aromatic
hydrocarbon fractions using liquid solid column chromatography: the
various column eluates, with or without dilution in carbon disulfide,
can then be analyzed by GC or GC/MS techniques. Aqueous samples need
to be liquid-liquid extracted with an appropriate solvent (i.e.,
trichlorotrifluoroethane) prior to analysis; solid samples would be
extracted with trichlorotrifluoroethane using soxhlet extraction or
sonication methods (1422). An aliquot of the sample extract, with or .
without concentration, is then analyzed by CC or (X/MS. Sampling and
analysis considerations for some specific components in gasoline, i.e.,.
benzene, toluene, xylenes, ethyl benzene and naphthalens have been
addressed in Volume 1.
Alternatively, the "oil and grease" content can be measured. This
determination would not be the measurement of an absolute quantity of a
specific component, but rather the quantitative determination of groups
of components with similar physic81 Ch8rSCteriStiCS (i.e., common
solubility in trichlorotrifluoroethane). The "oil and grease" content
iS defined 8s any material recovered from extraction with
trichlorotrifluoroethane and measured gravimetrically; extraction
methods are those described above for aqueous and soil samples.
A detection limit for automotive gasoline was not determined; the
detection limit for specific components is.expected to be in the range
of &L for aqueous samples and &g for non-aqueous samples.
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