Understanding Cannabis Testing

Residual Solvents

The Emerald Test (Residual Solvent in Hemp Oil)

Residual Solvent Screening


Various solvents (e.g., butane, heptane, hexane, etc.) can be used in processing methods to attain concentrated forms of cannabis. Solvents may not be entirely removed through heating, pressurization, or other cleansing procedures. Cumulative exposure to these solvents can negatively affect the health of the patient including harm to the central nervous and respiratory systems.

We utilize gas chromatography with mass spectrometry (GC/MS) to identify the quantity of any residual solvent to insure patient safety, and to assist cultivators in detection of potential issues in the extraction and purging processes. The residual solvents tested for in our screening are listed below:

 Benzene ≤ 1ppm
 Butanes ≤ 800 ppm
 Heptanes ≤ 500 ppm
 Hexane ≤ 10 ppm
 Toluene ≤ 1 ppm
 Total Xylenes ≤ 1 ppm
ppm = parts per million