Nebraska, ground water

D.A. Blum, J.A. Carr, R.K. Davis, and D.T. Pederson, Atrazine in a stream-aquifer system transport of atrazine and its environmental impact near Ashland, Nebraska Ground Water Monitor Remed. 13(2) 125, 1993. 

Although atrazine was regularly detected in Nebraska ground-water, 11 other pesticides were monitored, but not found (56). These included herbicides 2,4-D, EPTC, and silvex, and insecticides DDT, DDE, dieldrin, endrin, heptachlor, heptachlor epoxide, lindane, and methoxychlor. In this study, alachlor was found in 2 of 14 samples, 0.02 and 0.07 ppb similarly low residues of alachlor were found in 2 of 33 samples in another Nebraska study (55). 

D. W. Nelson and R. H. Dowdy, eds.. Methodsfor Ground Water Quality Studies, University of Nebraska, Lincoln, 1988. 

Weisenburger D (1993) Potential health consequences of ground-water contamination of nitrates in Nebraska. Nebr Med J 78 7-10... 

Atrazlne has been found in ground water in Nebraska (24,43, 56,57), Wisconsin (54), and Iowa (55). The concentrations in several dozen wells were typically 0.8 ppb. The four positives out of nine wells sampled in Iowa were associated with an adjacent river which was contaminated with atrazlne by runoff. In 1979 and 1980, positive correlations between atrazlne and nitrate in ground water were reported (56,24). It has been estimated that 0,07% of the atrazlne applied to the surface leached to a 1.5 m depth in Nebraska (57). 

Gormly J. R. and Spalding R. F. (1979) Sources and concentrations of nitrate-nitrogen in ground water of the Central Platte region, Nebraska. GroundWaterll, 291—301. 

Gardner, L.E., Diffendal, R.F. Williams, D.F. (1992) Stable isotope composition of calcareous paleosols and ground-water cements from the Ogallala Group (Neogene), western Nebraska. Contributions to Geology, University of Wyoming, 29(2), 97-109. 

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