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Total recoverable hydrocarbons
The National Environment Protection Measures (NEPM) are a nationally consistent approach to assessing site contamination.
The National Environmental Protection (Assessment of Site Contamination) Amendment Measure 2013 (No 1) clarifies definitions, extraction methods and reporting fractions for hydrocarbon analyses of samples from contaminated sites.
NEPM defines how the concentration of each fraction is determined, for example:
- fraction 1 includes all the hydrocarbons eluting (elution is closely correlated to boiling point) between n-hexane (C6) and n-decane (C10) with the sum of benzene, toluene, ethylbenzene and xylenes (BTEX) compounds subtracted
- fraction 2 is calculated as the difference between the >C10–C16 fraction and naphthalene; the concentration of naphthalene is derived from the volatile total recoverable hydrocarbons (TRH) analysis (purge and trap GC-MS)
The National Measurement Institute can help you meet your reporting requirements against the National Environment Protection (Assessment of Site Contamination) Measures.
Request the NEPM TRH–silica test when you suspect samples contain significant levels of non-petroleum based interferences (i.e. trade waste, soils with high organic content). The report from this test includes the semi-volatile fractions from >C10–C40.
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Limits of reporting
These are the minimum concentration that we can be reliably detected in our laboratories.
|TRH||NMI method||Limit of reporting for soil (mg/kg)||Limit of reporting for water (µg/L)|
|TRH C6–C10 less BTEX (F1)||NGCMS_1121||<25||<25|
|TRH >C10–C16 less Naph (F2)||NGCMS_1112||<50||<25|
|TRH >C16–C34 (F3)||NGCMS_1112||<100||<100|
|TRH >C34–C40 (F4)||NGCMS_1112||<100||<100|
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Find out how to submit your environmental testing samples.
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Last updated: 8 December 2020
Content ID: 64594