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Environmental fate & pathways

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Description of key information

Depending on the soil type the mobility of 2-{2-chloro-4-mesyl-3-[(tetrahydrofuran-2-ylmethoxy)methyl]benzoyl}cyclohexane-1,3-dione can be classified from mobile to low mobile in the tested soils.

Additional information

Adsorption/desorption:

The adsorption/desorption characteristics of 2-{2-chloro-4-mesyl-3-[(tetrahydrofuran-2-ylmethoxy)methyl]benzoyl}cyclohexane-1,3-dione were studied on sandy loam, silt loam, loam, and loamy sand soils in batch equilibrium experiments (M-442744-01-1; 2012) and (M-442744-02-1; 2012). The adsorption parameters were calculated using the Freundlich adsorption isotherm. In the definitive adsorption test 37.2 - 66.7% of the applied test material was adsorbed on the different soils used. The calculated adsorption constants KF(ads)of the FREUNDLICH isotherms for the five test soils ranged from 1.5 mL/g to 5.1 mL/g. The FREUNDLICH exponents 1/n were in the range of 0.8515 to 0.8740, indicating that the concentration of the test item did affect the adsorption behavior. At the end of one adsorption and one desorption phase, 13.6 - 46.9% of the initially adsorbed amount were desorbed on the different soils. The mean desorption KF(des)ranged from 1.7 - 6.1 mL/g and and the normalized KF,OC(des)ranged from 38.3 - 285.9 mL/g with a Mean KF,OC(ads) of 117 mL/g. The following table summarizes the key soil properties and results from the study:

Soil origin

#1

#2

#3

#4

#5

Soil type (USDA)

Sandy loam

Silt loam

Loam

Loamy sand

Silt loam

pH (0.01MCaCl2)

5.1

6.3

7.3

5.9

5.2

Organic carbon [%]

2.0

2.9

4.4

2.0

2.9

KF(ads)[mL/g]

4.9

1.9

1.5

1.8

5.1

1/n

0.8740

0.8700

0.8515

0.8678

0.8681

KF,OC(ads)[mL/g]

246.7

66.4

33.7

63.5

175.0

The test item can thus be classified as mobile or of low mobility depending on the tested soil type.