Chloropicrin

CAS RN:76-06-2

Soil Adsorption / Mobility

The Koc value in 4 soils has been reported as 81(1). According to a classification scheme(2), this Koc value suggests that chloropicrin is expected to have high mobility in soil. The Freundlich adsorption constant Kf and exponent 1/n were determined for chloropicrin in 3 organic soils, A, B, and C and Na-bentonite clay at 25 deg C(1). The Kf (ug/g-dry soil/ug/g-water) values were (soil (organic carbon), Kf): A (6.8%), 5.9; B (5.5%), 5.0; C (2.3%), 1.2; clay (0.2%), 560; exponent n was 1.2 for the organic soils and 1.0 for the clay. Its adsorption on Na-bentonite was higher than on kaolinite, which was negligible(1).

Chloropicrin is adsorbed more by mineral soil than by muck which has a higher organic content(1), indicating that adsorption to organic matter may not be the principle mechanism for adsorption. Also, chloropicrin adsorption was shown to increase with decreasing temperature(1). Chloropicrin readily penetrates sandy soil and diffuses horizontally along the soil surface when used as a soil fumigant in winter(2). An example of its ability to leach into soil is the contamination of a well by chloropicrin buried 35 meters away(3).

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