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: 811189–812835

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 should be chosen to give optimum reproducible recovery of analytes spiked into the 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 instrumental range.

                                       b. for high concentration (individual compounds >20 mg/kg):
                                       dichloromethane
                                       or
                                       hexane
CRC CARE TPH TECHNICAL WORKING GROUP   End-over-end tumbling/shaking

* Ensure samples do not overheat.

Note: Extract clean-up. Methods for the clean-up of some co-extracts/analytes are suggested below. The tables below list the specified US EPA SW-846 methods.

For samples of biological origin or containing high molecular weight materials: