Improved uptake models of nonionized pesticides to foliage and seed of crops.
The residual amount of nonionized pesticides incorporated to foliage and stem (foliage) and seed (fruit) of crops via root hairs from the water phase was estimated using the uptake models newly including metabolic parameters by which the amount of intact pesticide remaining in crops was considered with its proportion in a transpiration stream. A new parameter was also introduced for the seed model that accounts for the pesticide loss by adsorption to the inner surface of xylem tissue. Validation of the model was conducted using six pesticides with soybean and spinach plants. The ratio of the predicted concentration of pesticide to the measured one was 0.44-1.49 and 0.57-2.93 with foliage and seed models, respectively, showing that these improved models would be effective as a prediction tool.
Fujisawa
Takuo
T
Environmental Health Science Laboratory, Sumitomo Chemical Co., Ltd., 2-1 Takatsukasa 4-chome, Takarazuka 665-8555, Japan.
Ichise
Keiko
K
Fukushima
Masao
M
Katagi
Toshiyuki
T
Takimoto
Yoshiyuki
Y
D000327:Adsorption; D008954:Models, Biological; D010573:Pesticide Residues / Q000032:analysis*; D018515:Plant Leaves; D012639:Seeds; D012989:Soil Pollutants / Q000032:analysis; D013025:Glycine max / Q000378:metabolism*; D018724:Spinacia oleracea / Q000378:metabolism*
D010573:Pesticide Residues; D012989:Soil Pollutants