216 R.I. Code R. 216-RICR-60-05-6.22
The analytical sequence must include initial and continuing instrument calibrations performed per the approved method requirements. If the approved method does not specify calibration requirements, then analytical laboratories must at a minimum perform a three-point initial calibration spanning a concentration range from below to above the maximum allowable contaminant concentration. Analytical laboratories are required to achieve a linear response for all cannabinoids, metals, pesticides and solvent analyses. The initial calibration for each analyte must have a relative standard deviation of fifteen percent (15%) or a correlation factor of 0.995.
If approved analytical methods do not specify calibration requirements, the analytical sequence must include a continuing calibration standard and continuing calibration instrument blank before and after every ten samples (including quality control samples). The percent difference of the continuing calibration response for all analytes must be equal to or less than fifteen percent (15%) compared to the expected continuing calibration standard response. Analytical laboratories must document the calibration performance and quality control results for all analyses.
216 R.I. Code R. 216-RICR-60-05-6.22