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What is the difference between F4 Gravimetric (F4G) and Mineral Oil and Grease?

Modified on: Mon, 4 Feb, 2019 at 10:26 AM

In most ways, these two analyses are very similar: both are gravimetric analyses, targeting hexane-extractable, semi-volatile hydrocarbons including any compounds present >C50. Extracts in both methods are treated with silica gel to remove non-polar (non-petroleum) compounds. 

However, extracts analyzed using the F4 gravimetric method are dried in an oven at 100C for ~2 hours; in contrast, extracts analyzed using the Total Oil & Grease method (mineral portion) are dried at 40C in a fume hood. This means that samples analyzed using the Mineral Oil & Grease method would capture a higher proportion of hydrocarbons which would otherwise be lost at temperatures between 40C and 100C


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ENVIRONMENTAL

ENVIRONMENTAL CUSTOMER PORTAL INDUSTRIAL HYGIENE COMPRESSED BREATHING GAS ENVIRONMENTAL DNA (eDNA) FOOD INTERNAL ONLY - ENVIRONMENTAL
ENVIRONMENTAL CUSTOMER PORTAL INDUSTRIAL HYGIENE COMPRESSED BREATHING GAS ENVIRONMENTAL DNA (eDNA) FOOD INTERNAL ONLY - ENVIRONMENTAL
Solution home ENVIRONMENTAL Analysis and Testing

What is the difference between F4 Gravimetric (F4G) and Mineral Oil and Grease?

Modified on: Mon, 4 Feb, 2019 at 10:26 AM

In most ways, these two analyses are very similar: both are gravimetric analyses, targeting hexane-extractable, semi-volatile hydrocarbons including any compounds present >C50. Extracts in both methods are treated with silica gel to remove non-polar (non-petroleum) compounds. 

However, extracts analyzed using the F4 gravimetric method are dried in an oven at 100C for ~2 hours; in contrast, extracts analyzed using the Total Oil & Grease method (mineral portion) are dried at 40C in a fume hood. This means that samples analyzed using the Mineral Oil & Grease method would capture a higher proportion of hydrocarbons which would otherwise be lost at temperatures between 40C and 100C


pdf
Total Petrol...
(664 KB)

Did you find it helpful? Yes No

Send feedback
Sorry we couldn't be helpful. Help us improve this article with your feedback.