Long-Term Objectives

1. Determine residues of selected pesticides in surface waters of 5 watersheds in North Carolina over a 12-month period (Apr '95- Apr '96) (WRRI-funded research project)

2. Using current models, determine the compartmentalization of identified pesticides into air, soil and living systems.

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Short-Term Objectives

1. Determine residues of acetochlor, alachlor, aldicarb, atrazine, carbaryl, chlorothalonil, chlorpyrifos, 2,4-D and metolachlor on a monthly basis.

2. Based upon immunoassays, residues over 1.0 ppb will be extracted and analyzed by GC and GC/MS.

3. Based upon rainfall, sampling periods will be increased to twice a month at selected periods.

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Accomplishments

1. Have completed 6-months of sampling and analyses finding only 1QW levels (ca 0.1 to 4.0 ppb) of aldicarb, atrazine, carbaryl, 2,4-D and metolachlor (confirmed by GC/MS or CE).

2. Have obtained correlations between residues found at intake to those found in surface waters of watersheds.

3. Three samples of atrazine found above Drinking Water Standards.

From 6 months of sampling, we have found only low levels of pesticides in the 5 major watersheds in North Carolina. Atrazine has been the predominant herbicide found (55%) followed by metolachlor (499). Lawn care pesticides (e. g. chlorothalonil, chlorpyrifos and 2,4-D) have been found only in 5 samples and only 2,4-D was found above 1.0 ppb. The data indicate that there are residues of pesticides entering NC watersheds, but they are of low concentrations.

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Future Plans

1. Determine methodologies to trap selected pesticides in air which might enter NC surface waters.

2. Determine levels of these pesticides in rain and snow to determine their potential contribution to NC surface waters (Southeastern Regional Project, SRDC 94-07).

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