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Effects of Surface Area, Exchange Capacity, and Organic Matter Content on Miscible Displacement of Atrazine in Soils 1
Author(s) -
Snelling K. W.,
Hobbs J. A.,
Powers W. L.
Publication year - 1969
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1969.00021962006100060014x
Subject(s) - loam , atrazine , organic matter , soil water , cation exchange capacity , chemistry , silt , water content , soil science , environmental chemistry , environmental science , agronomy , geology , geotechnical engineering , pesticide , paleontology , organic chemistry , biology
Miscible displacement techniques were used to determine the effects of surface area, cation exchange capacity, and organic matter content on the movement of atrazine through saturated soil columns. A 0.05N BaCl 2 water solution containing 5 ppm atrazine was added to separate lucite cylinders each containing either silica sand, a fine sandy loam, silt loam, silty clay loam, or a muck soil. Breakthrough and closeout curves were plotted for atrazine as well as for the chloride and barium ions. Linear regression curves for relationships between the surface area, the exchange capacity, and the organic matter content of the soil and the difference in volume of solution required for chloride and atrazine breakthrough were drawn. These curves showed that retention by the soil is significantly higher for soils with greater surface areas, exchange capacities, and organic matter content.