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Scientific Investigations Report 2007–5180

U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2007–5180

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Table 8. Pesticides detected in stream and drain samples during the October–November 2000 sampling and Koc values, Yakima River Basin, Washington.

[Pesticide concentrations were screened at 0.020 micrograms per liter (µg/L). Number of samples, 33. Abbreviations: Koc, organic carbon-water partitioning coefficient; mL/g, milliliters per gram; P, pesticide detected one or more times below screening level; >, greater than; <, less than]

Compound Number of
detections		 Koc
(mL/g)
Parent pesticides
Clopyralid P 2
2,4-D 1 20
Carbofuran 1 22
Dinoseb P 30
Bromacil 4 32
Bentazon 6 34
Metalaxyl P 50
Hexazinone P 54
Terbacil 1 55
Tebuthiuron P 80
Atrazine 5 100
Simazine 2 130
Prometon P 150
Alachlor P 170
EPTC P 200
Linuron P 400
Diuron 2 480
Myclobutanil P 500
Norflurazon 1 600
Oryzalin P 600
Pesticide degradates
2-(4-tert-butylphenoxy)-cyclohexanol P < 300
Deethylatrazine 9 < 300
Deisopropylatrazine 1 < 300
Didealkylatrazine 3 < 300
3,4-Dichloroaniline P > 300
2-Hydroxyatrazine P > 300
p,p´-DDE P 50000

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