Section 16-309-160 - Cannabinoid concentration analysis(1) Cannabinoid concentration analysis, previously known as potency, is intended to quantitate and accurately report cannabinoids above the lower limit of quantitation as described in chapter 314-55 WAC.(2) Laboratories must use a method approved by the department to analyze cannabinoids.(3) Laboratories must limit batch size to 20 samples in a preparation batch not including quality controls.(4) ICV, CCV, and surrogate must meet a minimum of 80-120 percent recovery for each analyte.(5) LCS and matrix spike samples must meet a minimum of 70-130 percent recovery for each analyte.(6) Sample and matrix spike duplicates must have a relative percent difference (RPD) value of less than 20 percent.(7) Chromatographic performance must be described in method and must include, but is not limited to, the following criteria:(a) Tailing factor less than 2.0;(b) Column performance resolution greater than 1.0;(c) Retention time shift less than two percent.Wash. Admin. Code § 16-309-160
Adopted by WSR 24-09-079, Filed 4/17/2024, effective 5/18/2024