New performance-based method applicable to aqueous matrices that require the use of n-hexane as the extraction solvent and gravimetry as the determinative technique
A new method summary by 3M has been released by Presearch, entitled 'Method 1664 - N-Hexane Extractable Materials (HEM) and Silica Gel Treated N-Hexane Extractable Material (SGT-HEM) by Extraction and Gravimetry (Oil and Grease and Total Petroleum Hydrocarbons)'.
This is a performance-based method applicable to aqueous matrices that requires the use of n-hexane as the extraction solvent and gravimetry as the determinative technique.
Alternative extraction and concentration techniques are allowed, provided that all performance specifications are met.
This 3MT method summary is a modification of the EPA method where solid phase extraction replaces the liquid-liquid extraction technique.
This method summarises only the HEM quantification portion of method 1664.
A one litre water sample is passed through the new 3M Empore Oil and Grease Disk and eluted with n-hexane.
The extract is dried with sodium sulphate, hexane is evaporated and the residue is weighed and reported as HEM.
To find out the results and to view the full method summary download from Presearch's website or request CD-Rom or hard copy.
