Residual Solvents
and Processing Chemicals

Residual solvents are organic volatile chemicals that are used or produced in the manufacturing of products. Residual solvents analysis is required for manufactured cannabis products and pre-rolls. THC Analytical Lab identifies and quantifies the 20 analytes required by the state with gas chromatography–mass spectrometry (GC-MS). Samples that are tested for residual solvents and processing chemicals are deemed to have passed if they do not exceed the following limits:

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Category I                              

Cannabis Product or Pre-roll Action Level (μg/g)

1,2-Dichloroethane

Benzene

Chloroform

Ethylene oxide

Methylene chloride

Trichloroethylene

1.0

1.0

1.0

1.0

1.0

1.0

Category II                          

Cannabis Product or Pre-roll Action Level (μg/g)

Acetone

Acetonitrile

Butane

Ethanol

Ethyl acetate

Ethyl ether

Heptane

Hexane

Isopropyl alcohol

Methanol

Pentane

Propane

Toluene

Total xylenes

5000

410

5000

5000

5000

5000

5000

290

5000

3000

5000

5000

890

2170