The effect of ammonia on atrazine sorption and transport
1996
Clay, S.A. | Clay, D.E. | Liu, Z. | Harper, S.S.
Ammonia application increased soil solution pH and decreased atrazine sorption to soil. Kf values for atrazine were 5:2 in nonamended soil (pH = 5.7) and 2.9 and 2.2 for ammonia-amended soils at pH 7.8 and pH 8.9, respectively. Atrazine sorption was affected differentially by base treatments of KOH and NaOH compared to NH4OH. These results suggest that factors other than pH modification influenced atrazine sorption characteristics. Incubation of atrazine in NH4OH extracts from soil indicated that hydroxyatrazine (HA) could be formed, however, in the presence of soil, HA was not detected. Partition coefficients for HA at pH values of 5.7, 7.8, and 8.9 were 130, 0.7, and 0.1, respectively. Ammonia application increased the potential of atrazine to leach through soil.
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