DETERMINATION OF CYPERMETHRIN CONTENT IN OSCILLATING PRESSURE TREATED RUBBERWOOD

Abstract

Rubberwood samples at three different moisture contents were treated with cypermethrin by oscillating pressure method. The amount of cypermethrin in the wood was determined immediately after treatment and after drying by calculation and by high performance liquid chromatography (HPLC). Results showed that the amount of cypermethrin detected by HPLC was much lower
than that by calculation. Rubberwood samples of low moisture contents gave better penetration of cypermethrin. Cypermethrin was detected only in the first layer (1 cm) of the treated green samples at all drying conditions. For the samples treated at lower moisture contents, cypermethrin was detected in all three layers taken. However, the amount of cypermethrin detected decreased as the drying time increased,