Helium was used as carrier gas with primary pressure of 570 KPa. The split injection mode was used with a split ratio of 10.0. The injection volume of each sample was 1 μL and the total time for one GC-MS run was 27 min. Mass spectrometer settings: electron impact ionization mode with an electron energy of 70 eV, ion source and interface temperatures were set at 200 and 270 °C, respectively and scan mass range m/z 50-500. Shimadzu 2600 UV-Vis spectrophotometer was used to estimate the amount of entrapped pesticide at 214 nm during the aqueous release study after every 24 h. The calibration curve of ChP was prepared in MeOH. The synthesis of modified montmorillonite was adapted from the literature with minor changes to improve textural properties, especially pore volume and surface area of clay samples. 37 2g of clay was added to a 20ml solution of 6M hydrochloric acid. The mixture was then heated for 4 hours in an oil bath at 95°C while stirring at 600 rpm. The suspension was then washed with distilled water before being dried overnight in a 100°C oven. The powder was vacuumdried for another 24 hours before application.