title: Studies on the fate of ready-mix formulation of endosulfan and cypermethrin in tea.
abstract: Ready-mix formulation consists of two insecticides-endosulfan (35%) and cypermethrin (5%). To understand the dissipation pattern of the insecticides on made tea from the north-east region of India, it was applied twice in 10 day interval @ 1,000 mL/ha (350 g a.i. endosulfan + 50 g a.i. cypermethrin) and 2,000 mL/ha (700 g a.i. endosulfan + 100 g a.i. cypermethrin) along with untreated control. The made tea samples were collected at 0, 1, 3 and 7 days interval after last application. The dissipation rate of endosulfan and cypermethrin followed first order kinetics. The calculated half-life values were found in the range between 1.7 to 2.1 days for endosulfan and 1.0 to 1.1 days for cypermethrin.
authors.affiliation: Pesticide Residue Laboratory, Department of Agricultural Chemicals, Bidhan Chandra Krishi Viswavidyalaya, Mohanpur 741 252, West Bengal, India. skpramanik@gmail.com
authors.forename: Sukhendu Kumar
authors.initials: SK
authors.lastname: Pramanik
authors.forename: Parimal
authors.initials: P
authors.lastname: Saha
authors.forename: Anjan
authors.initials: A
authors.lastname: Bhattacharyya
authors.forename: Arun V
authors.initials: AV
authors.lastname: Dhuri
mesh_terms: D004726:Endosulfan / Q000032:analysis*; D005506:Food Contamination / Q000032:analysis*; D007306:Insecticides / Q000032:analysis*; D008956:Models, Chemical; D011722:Pyrethrins / Q000032:analysis*; D013662:Tea / Q000737:chemistry*
chemical_list: D007306:Insecticides; D011722:Pyrethrins; D013662:Tea; C017160:cypermethrin; D004726:Endosulfan