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The Acetochlor Registration Partnership Surface Water Monitoring Program for Four Corn Herbicides

^a Monsanto Company, 800 North Lindbergh Boulevard, St. Louis, MO 63167
^b Syngenta Crop Protection, P.O. Box 18300, Greensboro, NC 27419-8300
^c Dow AgroSciences LLC, 9330 Zionsville Road, Indianapolis, IN 46268
^d Klein & Associates, 12917 Topping Estates Drive, Town & Country, MO 63131
^e Stone Environmental, 535 Stone Cutters Way, 3rd Floor, Montpelier, VT 05602

View larger version (54K): [in a new window]   Fig. 1. Corn herbicide use trends (1990–2001) in the United States (National Agricultural Statistics Service, 2004).

View larger version (12K): [in a new window]   Fig. 2. Herbicide structure.

View larger version (122K): [in a new window]   Fig. 3. Map showing the location of all monitored community water systems (CWSs). CI, corn intensity.

View larger version (33K): [in a new window]   Fig. 4. Box plot of annualized mean concentrations (AMCs) of parent herbicides in finished drinking water. The dashed line is the limit of quantitation (LOQ) for individual samples.

View larger version (13K): [in a new window]   Fig. 5. Frequency of drinking water detections by year for parent herbicides as a function of use.

View larger version (34K): [in a new window]   Fig. 6. Box plot of annualized mean concentrations (AMCs) of chloroacetanilide degradates in finished drinking water. The dashed line is the limit of quantitation (LOQ) for individual samples. ESA, ethanesulfonic acid; OXA, oxanilic acid.

View larger version (22K): [in a new window]   Fig. 7. Frequency of atrazine annualized mean concentrations (AMCs) > 3 µg L–1 by source type and sampling stratum. CI, corn intensity.

View larger version (36K): [in a new window]   Fig. 8. Frequency of drinking water detections by season for parent herbicides.

View larger version (37K): [in a new window]   Fig. 9. Frequency of drinking water detections by season for degradates. ESA, ethanesulfonic acid; OXA, oxanilic acid.