RESIDUAL SOLVENTS
Chemical solvents are used to extract valuable therapeutic and psychoactive compounds from cannabis flowers, including cannabinoids like tetrahydrocannabinol (THC) and cannabidiol (CBD) as well as terpenes like limonene and pinene. The highly concentrated oily or waxy extracts that result can be heated and inhaled directly or infused in foods, drinks, and other products. Residual solvents are extraction by-products from those processes.
ASL’s residual solvents analysis is performed using Headspace Gas Chromatography with Flame-Ionization Detection (HS-GC-FID).
Per Colorado law, the following are the solvents and their limits that are being tested under this method (ppm = Parts Per Million):
| Acetone < 1000 ppm | Butanes < 1000 ppm |
| Ethanol < 1000 ppm | Heptanes < 1000 ppm |
| Isopropyl Alcohol < 1000 ppm | Propane < 1000 ppm |
| Benzene < 2 ppm | Toluene < 180 ppm |
| Pentane < 1000 ppm | Hexane < 60 ppm |
| Total Xylenes < 430 ppm | Methanol < 600 ppm |
| Ethyl Acetate < 1000 ppm |
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