Abstract
A capillary GC method was developed for the determination of 21 active ingredients, including nine pyrethroidal insecticides, in the commercially available insecticide formulations (aerosol, mosquito coil and mat). These active ingredients were separated on a DB-17 fused silica capillary column (0.53 mm i.d. and 30 m in length), and determined at 100→260°C using benzyl benzoate as an internal standard. When d-tetramethrin and d-phenothrin were admixed in insecticide formulations they could not be separated from each other, but could be separated on a DB-23 fused silica capillary column (0.53 mm i.d. and 15 m in length). The results of this determination agreed with those obtained using packed columns.
