the intent to present a hydrocarbontype or a gas chromatographic method, but to describe the combined use of the two methods to eliminate costly distillation time.The majority of gasoline samples analyzed by this laboratory for hydrocarbon types are sufficiently nonvolatile to be charged into the mass spectrometer at ambient temperature, by a constant-volume pipet and a mercury orifice. However, if samples are so volatile that vapor loss occurs when this charging technique is used, alternate charging procedures may be used, provided the liquid volume of the sample charge may be measured or calculated.
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