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Differentiating Nonpoint Sources of Deisopropylatrazine in Surface Water Using Discrimination Diagrams

^a U.S. Geological Survey, 4500 SW 40th Ave., Ocala, FL 34474
^b U.S. Geological Survey, 4821 Quail Crest Place, Lawrence, KS 66049
^c U.S. Geological Survey, Box 25046, Denver Federal Center, MS 406, Denver, CO 80225

View larger version (13K): [in a new window]   Fig. 1. Structure diagram showing common dealkylation pathways of atrazine, cyanazine, simazine, and propazine for the formation of deethylatrazine (DEA) and deisopropylatrazine (DIA).

View larger version (43K): [in a new window]   Fig. 2. (A) Temporal variation of the concentration of deethylatrazine (DEA) and deisopropylatrazine (DIA) in surface runoff. (B) Scatter plots showing the relationship of DIA to DEA for surface runoff from the cyanazine and atrazine field plots. (C) Temporal variation of the concentration ratio of DIA to DEA (D2R) for samples from the cyanazine and atrazine field plots.

View larger version (41K): [in a new window]   Fig. 3. Temporal variation of the concentration of atrazine, cyanazine, simazine, propazine, and stream flow for the Delaware River, KS and Iroquois River, IL, 1990.

View larger version (28K): [in a new window]   Fig. 4. (A, B) Shows the temporal variation of the concentration ratio of atrazine to cyanazine (ACR) among ACR categories for the Delaware River, KS and the Iroquois River, IL. (C, D) Discrimination diagram showing the influence of the ACR on the temporal variation of the concentration ratio of deethylatrazine to deisopropylatrazine (D2R) among discrimination fields for the Delaware River, KS and the Iroquois River, IL, 1990.

View larger version (24K): [in a new window]   Fig. 5. (A) Temporal variation of the concentration ratio of atrazine to cyanazine (ACR) among ACR categories. (B) Discrimination diagram showing the influence of the ACR on the temporal variation of the concentration ratio of deethylatrazine and deisopropylatrazine (D2R) among discrimination fields for the Mississippi River at Baton Rouge, LA, 1993.