Restkoncentrationsdefinition: summen af pyridat, dets hydrolyseprodukt CL 9673 (6-chlor-4-hydroxy-3-phenylpyridazin) og hydrolyserbare konjugater af CL 9673, udtrykt som pyridat.
Residue definition: sum of pyridate, its hydrolysis product CL 9673 (6-chloro-4-hydroxy-3-phenylpyridazin) and hydrolysable conjugates of CL 9673 expressed as pyridate.