Holtgreve N D
J Assoc Off Anal Chem. 1978 Jul;61(4):906-7.
An improved method has been developed for extracting light filth in rubbed sage. The method is similar to 44.A04 and 44.A05, except the light filth is isolated by using 20% isopropanol with mineral oil. Collaborative results show that the proposed method yielded better recoveries than the present official first action method. The method has been adopted as official first action.
