HEM/SGT PER EPA 1664

Specifications
Test Name:
HEM/SGT PER EPA 1664
Test Code:
HEM_W
Test Number:
E1664
Matrix:
Aqueous
Units:
mg/L

Summary

The sample is acidified and serially extracted three times with n-hexane in a separatory funnel. The extract is dried over sodium sulfate. The solvent is distilled from the extract and the residue from the extract is desiccated. The amount of HEM in the extract is measured by weighing the dry residue on a balance.

If the HEM is to be used for determination of SGT-HEM, the HEM is redissolved in n-hexane and silica gel is added to remove polar materials. The solution is filtered to remove the silica gel, the solvent is distilled, and the residue is desiccated. The amount of SGT-HEM in the extract is measured by weighing the dry residue on a balance.

Typical Method Detection/Reporting Limits
Type
A
A
Analyte
HEM - Hexane Extractable Material
SGT - Silica Gel Treated (Non-Polar Extractable Material)
MDL
0.507
0.994
PQL
5
5
A = Analyte, S = Surrogate
Information Updated: 9/20/2010