Pesticides Research, 86 – Fate of Pyrethroids in Farmland Ponds

Fate of Pyrethroids in Farmland Ponds

Substances	Experimental area	Sediment pore diffusion D_sed (m²/h)	Sediment solids adsorption R_sed (-)	Sediment pore water degradation k_sed (1/h) (DT₅₀ (d))	Water column degradation k_wc (1/h)	Diffusion resistance in laminar boundary layer 101 (m/h)	Adsorption to suspended solids in water column R_sus (-)	Macro-scopic adsorption in water column R_macro (-)
esfenvalerate permethrin deltamethrin	pond 4 (1996)	1.3 10-4	400	9.4 (1.2)	-	-	-	-
fenpropathrin	pond 3 and 4 (1995 and 1996)	1.3 10-4	1300	-	-	-	-	-
esfenvalerate permethrin	pond 3 (1996)	1.3 10-4	400	9.4 (1.2)	-	-	1.9	-
deltamethrin	pond 3 (1996)	1.3 10-4	400	9.4 (1.2)	-	-	3.5	-
fenvalerate	laboratory test	2.7 10-6	400	0.72 (16)	-	-	-	-