Document ID: chunk:federal_register_of_legislation:F2013C00288:reg:3550c
Version: federal_register_of_legislation:F2013C00288
Segment Type: reg
Provision Reference: reg 3550C
Character Range: 805702–806509

3550C  Ultrasonic extraction* using:
       a. for low concentration (individual compounds <20 mg/kg):
       dichloromethane
       or
       dichloromethane/acetone (1:1)
       or
       hexane/acetone (1:1)
       or
       methyl tertiary-butyl ether
       or
       methyl tertiary-butyl ether/methanol (2:1).

       The solvent system chosen should be shown to give optimum, reproducible recovery of analytes spiked into the particular matrix (soil type) under test.
       Analysts should determine an appropriate concentration limit and ensure that quantitative results are based on sample concentrations that do not exceed the instrument range.
       b. for high concentration (individual compounds >20 mg/kg):
       dichloromethane
       or
       hexane

* Ensure samples do not overheat.