Gasoline range organics GRO

The concentration step is used to extract the more volatile gasoline components from the matrix and is applicable to both soil and water. The method is used to determine the concentration of gasoline range (C4-C10). The range can be extended to cover up to C13, which includes naphthalene but this additional measurement should not be included in the GRO value. 

With the advent of unleaded gasolines, the oxygenates, such as MTBE which have been used to replace lead additives, are readily soluble in water and have low vapour pressures making purge and trap less of an option especially when the recommended method of extraction of the soil by methanol is adopted. 

By using this approach the GRO concentration as well as BTEX and MTBE concentrations are determined. TPHV (C4-C13) can also be quoted especially if aviation kerosenes are apparent. Tetraethyl lead can also be detected. 

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The analysis is often called the gasoline range organics (GRO) method. The semivolatile range is determined by analysis of an extract by gas chromatography-flame ionization and is referred to as the diesel range organics (DRO) method. 

BP = boiling point DRO = diesel range organics GC = gas chromatography GRO = gasoline range organics FID = flame ionization detector ... 

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