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EC number: 204-029-1 | CAS number: 113-48-4
- Life Cycle description
- Uses advised against
- Endpoint summary
- Appearance / physical state / colour
- Melting point / freezing point
- Boiling point
- Density
- Particle size distribution (Granulometry)
- Vapour pressure
- Partition coefficient
- Water solubility
- Solubility in organic solvents / fat solubility
- Surface tension
- Flash point
- Auto flammability
- Flammability
- Explosiveness
- Oxidising properties
- Oxidation reduction potential
- Stability in organic solvents and identity of relevant degradation products
- Storage stability and reactivity towards container material
- Stability: thermal, sunlight, metals
- pH
- Dissociation constant
- Viscosity
- Additional physico-chemical information
- Additional physico-chemical properties of nanomaterials
- Nanomaterial agglomeration / aggregation
- Nanomaterial crystalline phase
- Nanomaterial crystallite and grain size
- Nanomaterial aspect ratio / shape
- Nanomaterial specific surface area
- Nanomaterial Zeta potential
- Nanomaterial surface chemistry
- Nanomaterial dustiness
- Nanomaterial porosity
- Nanomaterial pour density
- Nanomaterial photocatalytic activity
- Nanomaterial radical formation potential
- Nanomaterial catalytic activity
- Endpoint summary
- Stability
- Biodegradation
- Bioaccumulation
- Transport and distribution
- Environmental data
- Additional information on environmental fate and behaviour
- Ecotoxicological Summary
- Aquatic toxicity
- Endpoint summary
- Short-term toxicity to fish
- Long-term toxicity to fish
- Short-term toxicity to aquatic invertebrates
- Long-term toxicity to aquatic invertebrates
- Toxicity to aquatic algae and cyanobacteria
- Toxicity to aquatic plants other than algae
- Toxicity to microorganisms
- Endocrine disrupter testing in aquatic vertebrates – in vivo
- Toxicity to other aquatic organisms
- Sediment toxicity
- Terrestrial toxicity
- Biological effects monitoring
- Biotransformation and kinetics
- Additional ecotoxological information
- Toxicological Summary
- Toxicokinetics, metabolism and distribution
- Acute Toxicity
- Irritation / corrosion
- Sensitisation
- Repeated dose toxicity
- Genetic toxicity
- Carcinogenicity
- Toxicity to reproduction
- Specific investigations
- Exposure related observations in humans
- Toxic effects on livestock and pets
- Additional toxicological data
Adsorption / desorption
Administrative data
Link to relevant study record(s)
- Endpoint:
- adsorption / desorption: screening
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 18 July 1991 to 17 Dec 1992
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- other: U.S. EPA FIFRA N-163-1 and 40 CFR, Sec. 158.130
- Qualifier:
- equivalent or similar to guideline
- Guideline:
- OECD Guideline 106 (Adsorption - Desorption Using a Batch Equilibrium Method)
- GLP compliance:
- yes
- Remarks:
- soil characterization data supplied by A&L Laboratories cannot be verified for complying with the current Good Laboratory Practice standards.
- Type of method:
- batch equilibrium method
- Media:
- soil
- Specific details on test material used for the study:
- [Hexyl-1-14C]-MGK264: Purity - 98%;
- Radiolabelling:
- yes
- Test temperature:
- 25 +/- 1 °C
- Analytical monitoring:
- yes
- Details on sampling:
- Nominal Concentrations for all 4 soils Definitive test: 0.1, 0.25, 0.5 and 1.0 ppm
Liquid scintillation counting analysis was used to measure the test material concentrations in the aqueous phases. The amount of 14C-test material remaining adsorbed on the soil was determined by combustion-radioanalysis. - Matrix no.:
- #1
- Matrix type:
- clay loam
- % Clay:
- ca. 38
- % Silt:
- ca. 40
- % Sand:
- ca. 22
- % Org. carbon:
- ca. 0.65
- pH:
- ca. 6.4
- CEC:
- ca. 19.6 meq/100 g soil d.w.
- Bulk density (g/cm³):
- ca. 1.38
- Matrix no.:
- #2
- Matrix type:
- silt loam
- % Clay:
- ca. 24
- % Silt:
- ca. 52
- % Sand:
- ca. 24
- % Org. carbon:
- ca. 2.1
- pH:
- ca. 7.4
- CEC:
- ca. 22.7 meq/100 g soil d.w.
- Bulk density (g/cm³):
- ca. 1.08
- Matrix no.:
- #3
- Matrix type:
- sand
- % Clay:
- ca. 4
- % Silt:
- ca. 4
- % Sand:
- ca. 92
- % Org. carbon:
- ca. 0.25
- pH:
- ca. 7.4
- CEC:
- ca. 0.3 meq/100 g soil d.w.
- Bulk density (g/cm³):
- ca. 1.64
- Matrix no.:
- #4
- Matrix type:
- sandy loam
- % Clay:
- ca. 13
- % Silt:
- ca. 28
- % Sand:
- ca. 59
- % Org. carbon:
- ca. 0.35
- pH:
- ca. 8.5
- CEC:
- ca. 19.8 meq/100 g soil d.w.
- Bulk density (g/cm³):
- ca. 1.16
- Details on matrix:
- Test Soils
ABC Laboratories, Inc., Columbia, Missouri, supplied the #1 clay loam, #2
silt loam, #3 sand, and #4 sandy loam. Representative subsamples of the #1
clay loam, #2 silt loam, and #3 sand were shipped to A & L Mid West
Agricultural Laboratories, Inc., 13611 B Street, Omaha, Nebraska, for
characterization. A representative subsample of the #4 sandy loam soil was
shipped to AGVISE, Highway 15, Northwoods, North Dakota, for
characterization - Details on test conditions:
- Preliminary: 1ppm concentration and 1:10 soil:solution ratio used for each soil
Duplicates of each soil sampled at 2, 4, 6, 24 and 48 hours. Kd values suggest 4 hr was optimum adsorption equilibrium for #3 and 6 hr for soils #1 #,2 and #4 - Computational methods:
- Adsorption properties can be characterized by the Freundlich isotherm:
x/m = k Ce^(1/n) or ln x/m = ln kd + 1/n ln Ce
where:
x = the amount of chemical adsorbed in μg
m = mass of adsorbent in grams, dry soil equivalent weight (l.000 g)
ln = natural logarithm
when in equilibrium with an aqueous solution, where:
Ce = concentration of chemical in aqueous solution in μg/mL
k = Freundlich adsorption coefficient
n = a constant
The Freundlich isotherm given as ln x/m = ln k + l/n ln Ce is in the
form of a line equation. Calculations were made of x/m, ln Ce, and ln
x/m. From these data, ln Ce was plotted versus ln x/m. The line
equations for the adsorption isotherm for each of the three sediment types
were determined by linear regression analysis (Table XV). The constants
k and n were determined for each sediment type from the slope (l/n) and
y-intercept (ln k) of the corresponding line equation. The adsorption
constant K0c for each sediment type was determined by using the equation:
Koc = (Kd / % OC) * 100
where:
% OC = the soil organic carbon content - Key result
- Sample No.:
- #1
- Type:
- Koc
- Value:
- ca. 3 106 dimensionless
- Temp.:
- 25 °C
- Matrix:
- Clay Loam
- % Org. carbon:
- ca. 0.65
- Key result
- Sample No.:
- #2
- Type:
- Koc
- Value:
- ca. 1 588 dimensionless
- Temp.:
- 25 °C
- Matrix:
- Silt Loam
- % Org. carbon:
- ca. 2.1
- Key result
- Sample No.:
- #3
- Type:
- Koc
- Value:
- ca. 636 dimensionless
- Temp.:
- 25 °C
- Matrix:
- Sand
- % Org. carbon:
- ca. 0.25
- Key result
- Sample No.:
- #4
- Type:
- Koc
- Value:
- ca. 1 555 dimensionless
- Temp.:
- 25 °C
- Matrix:
- Sandy Loam
- % Org. carbon:
- ca. 0.35
- Adsorption and desorption constants:
- % Organic
Carbon Adsorption Desorption
Soil Type Kd Koc -Kd Koc
Clay Loam 0.65 20.2 3106 9.2 1419
Silt Loam 2.1 33.3 1588 9.3 441
Sand 0.25 1.6 636 10.2 4099
Sandy Loam 0.35 5.4 1555 9.8 2797 - Recovery of test material:
- Mean Mass balance recoveries across 5 consentrations for each soil:
Clay Loam: 101.5 % with SD = 10.3
Silt Loam: 101.6 % with SD = 3.8
Sand: 100.3 % with SD = 4.0
Sandy Loam: 98.9 % with SD = 5.2 - Concentration of test substance at end of adsorption equilibration period:
- Adsorbed (%)
Nominal Test Clay Loam Silt loam Sand Sandy loam
Concentration
(ppm)
0.10 75.5 83.0 9.5 34.0
0.10 58.9 82.1 7.0 32.5
0.25 79.0 82.6 13.6 36.7
0.25 72.9 81.9 9.0 32.4
0.50 69.8 80.9 9.8 36.8
0.50 70.0 80.4 10.6 31.5
1.0 70.2 80.6 16.7 40.1
1.0 67.6 79.1 12.1 33.3 - Concentration of test substance at end of desorption equilibration period:
- Desorbed (%)
Nominal Test Clay Loam Silt loam Sand Sandy loam
Concentration
(ppm)
0.10 14.9 10.8 11.4 23.0
0.10 16.8 10.1 11.1 23.6
0.25 14.4 10.7 9.5 21.3
0.25 15.3 10.9 10.0 20.3
0.50 15.6 11.2 9.2 20.2
0.50 15.5 11.8 11.2 21.4
1.0 15.1 11.0 8.6 18.7
1.0 16.2 12.1 8.6 21.1 - Transformation products:
- no
- Remarks:
- HPLC was used to check stability of Test item. For all 4 four soils >98% stability observed.
- Details on results (Batch equilibrium method):
- Soil Type % Organic % Organic Stage of Kd Koc2 n
Matter carbon study
Clay Loam 1.3 0.65 AD 20.2 3106 1.1
DE 9.2 1419 1.0
Silt Loam 4.2 2.1 AD 33.3 1588 1.1
DE 9.3 441 1.0
Sand 0.5 0.25 AD 1.6 636 0.8
DE 10.2 4099 1.0
Sandy Loam 0.7 0.35 AD 5.4 1555 1.0
DE 9.8 2797 1.0 - Statistics:
- Adsorption properties can be characterized by the Freundlich isotherm:
x/m = k Ce^(1/n) or ln x/m = ln kd + 1/n ln Ce
where:
x = the amount of chemical adsorbed in μg
m = mass of adsorbent in grams, dry soil equivalent weight (l.000 g)
ln = natural logarithm
when in equilibrium with an aqueous solution, where:
Ce = concentration of chemical in aqueous solution in μg/mL
k = Freundlich adsorption coefficient
n = a constant
The Freundlich isotherm given as ln x/m = ln k + l/n ln Ce is in the
form of a line equation. Calculations were made of x/m, ln Ce, and ln
x/m. From these data, ln Ce was plotted versus ln x/m. The line
equations for the adsorption isotherm for each of the three sediment types
were determined by linear regression analysis (Table XV). The constants
k and n were determined for each sediment type from the slope (l/n) and
y-intercept (ln k) of the corresponding line equation. The adsorption
constant K0c for each sediment type was determined by using the equation:
Koc = (Kd / % OC) * 100
where:
% OC = the soil organic carbon content - Validity criteria fulfilled:
- yes
- Conclusions:
- Soil Type % Organic Stage of Kd Koc2 Mobility Class
carbon study
Clay Loam 0.65 AD 20.2 3106 Slight
DE 9.2 1419
Silt Loam 2.1 AD 33.3 1588 Low
DE 9.3 441
Sand 0.25 AD 1.6 636 Low
DE 10.2 4099
Sandy Loam 0.35 AD 5.4 1555 Low - Executive summary:
An OECD 106 (Adsorption/desorption using a batch equilibrium method) study is available for MGK 264 in clay loam, silt loam, sand and sandy loam soils.
Only two of the soils fell within the desired adsorption range of 20 to 80% for the Freundlich model. However, the adsorption isotherms for all soil types showed a high degree of linear correlation for a plot of ln (Ce) versus ln (x/m). Correlation coefficients for the adsorption isotherms of soils clay loam, silt loam, sand, and sandy loam were 0.958, 0.999, 0.983, and 0.994, respectively. The correlation coefficients for the adsorption isotherms imply that all of the soils adequately fit the Freundlich model for this compound.
Desorption isotherms were calculated for all soil types. The correlation coefficients for the desorption isotherms determined for soils clay loam, silt loam, sand, and sandy loam were 1.000, 1.000, 1.000, and 0.999, respectively. The correlation coefficients for the desorption isotherms also imply that all of the soils adequately fit the Freundlich model for this compound.
The mean 14C-mass balance of the test compound for clay loam, silt loam, sand, and sandy loam was 101.5, 101.6, 100.3, and 98.9%, respectively. High-performance liquid chromatography was used to test the stability of the test compound under study conditions. The percent of parent compound observed in the adsorption phase was 99.3, 100.0, 98.6, and 98.3% for clay loam, silt loam, sand, and sandy loam, respectively.
Mean Koc over the 4 soils was 1721.25 and 2189 for desorption.
Reference
Adsorption Isotherm Data of MGK264 with Clay Loam
|
µgin |
µgin Solution |
|
|
||||
Nominal |
|
|
Solution |
After |
µg of |
|||
Concentration(ppm) |
Replicate Number |
Ce(ppm)2 |
atInitiation |
AdsorptionPhase |
Compound Adsorbed |
x/m |
lnCe |
ln x/m |
0.10 |
I |
0.02 |
0.90 |
0.23 |
0.67 |
0.67 |
-3.73 |
-0.39 |
0.10 |
II |
0.04 |
0.90 |
0.37 |
0.53 |
0.53 |
-3.24 |
-0.63 |
0.25 |
I |
0.05 |
2.41 |
0.51 |
1.91 |
1.91 |
-2.94 |
0.65 |
0.25 |
II |
0.07 |
2.41 |
0.65 |
1.76 |
1.76 |
-2.68 |
0.56 |
0.50 |
I |
0.15 |
4.83 |
1.46 |
3.37 |
3.37 |
-1.88 |
1.22 |
0.50 |
II |
0.15 |
4.83 |
1.45 |
3.38 |
3.38 |
-1.87 |
1.22 |
1.0 |
I |
0.31 |
9.92 |
2.95 |
6.97 |
6.97 |
-1.16 |
1.94 |
1.0 |
II |
0.34 |
9.92 |
3.21 |
6.71 |
6.71 |
-1.09 |
1.90 |
Desorption Data of Clay Loam
Nominal |
|
|
Solution |
After |
Solution |
|
|
Concentration |
Replicate |
Ce |
at |
Adsorption |
AfterDesorption |
|
|
(ppm) |
Number |
(ppm)2 |
Initiation |
Phase |
Phase x/m |
ln Ce |
ln x/m |
0.10 |
I |
0.01 |
0.90 |
0.23 |
0.14 |
0.14 |
-4.24 |
-2.00 |
0.10 |
II |
0.02 |
0.90 |
0.37 |
0.15 |
0.15 |
-4.12 |
-1.89 |
0.25 |
I |
0.04 |
2.41 |
0.51 |
0.35 |
0.35 |
-3.28 |
-1.06 |
0.25 |
II |
0.04 |
2.41 |
0.65 |
0.37 |
0.37 |
-3.25 |
-1.00 |
0.50 |
I |
0.08 |
4.83 |
1.46 |
0.75 |
0.75 |
-2.51 |
-0.28 |
0.50 |
II |
0.08 |
4.83 |
1.45 |
0.75 |
0.75 |
-2.50 |
-0.29 |
1.0 |
I |
0.16 |
9.92 |
2.95 |
1.49 |
1.49 |
-1.83 |
0.40 |
1.0 |
II |
0.17 |
9.92 |
3.21 |
1.61 |
1.61 |
-1.76 |
0.48 |
Adsorption Isotherm Data of MGK264 with Silt Loam
|
µgin |
µginSolution |
|
|
||||
Nominal |
|
|
Solution |
After |
µgof |
|||
Concentration(ppm) |
ReplicateNumber |
Ce(ppm)2 |
atInitiation |
AdsorptionPhase |
CompoundAdsorbed |
x/m |
ln Ce |
lnx/m |
0.10 |
I |
0.02 |
0.90 |
0.15 |
0.75 |
0.75 |
-4.11 |
-0.29 |
0.10 |
II |
0.02 |
0.90 |
0.16 |
0.74 |
0.74 |
-4.07 |
-0.30 |
0.25 |
I |
0.04 |
2.41 |
0.42 |
1.99 |
1.99 |
-3.11 |
0.69 |
0.25 |
II |
0.05 |
2.41 |
0.44 |
1.97 |
1.97 |
-3.07 |
0.68 |
0.50 |
I |
0.10 |
4.83 |
0.92 |
3.91 |
3.91 |
-2.32 |
1.36 |
0.50 |
II |
0.10 |
4.83 |
0.95 |
3.88 |
3.88 |
-2.31 |
1.36 |
1.0 |
I |
0.20 |
9.92 |
1.93 |
7.99 |
7.99 |
-1.59 |
2.08 |
1.0 |
II |
0.22 |
9.92 |
2.07 |
7.85 |
7.85 |
-1.51 |
2.06 |
Desorption Data of Silt Loam
|
µgm |
µg Removed |
µg in Solution |
|
||||
Nominal Concentration |
Replicate |
|
Solutionat |
AfterAdsorption |
AfterDesorption |
|||
(ppm) |
Number |
Ce(ppm)2 |
Initiation |
Phase |
Phase |
x/m |
ln Ce |
lnx/m |
0.10 |
I |
0.01 |
0.90 |
0.15 |
0.10 |
0.10 |
-4.56 |
-2.33 |
0.10 |
II |
0.01 |
0.90 |
0.16 |
0.09 |
0.09 |
-4.64 |
-2.39 |
0.25 |
I |
0.03 |
2.41 |
0.42 |
0.26 |
0.26 |
-3.59 |
-1.36 |
0.25 |
II |
0.03 |
2.41 |
0.44 |
0.26 |
0.26 |
-3.56 |
-1.33 |
0.50 |
I |
0.06 |
4.83 |
0.92 |
0.54 |
0.54 |
-2.85 |
-0.62 |
0.50 |
II |
0.06 |
4.83 |
0.95 |
0.57 |
0.57 |
-2.80 |
-0.56 |
1.0 |
I |
0.12 |
9.92 |
1.93 |
1.09 |
1.09 |
-2.15 |
0.09 |
1.0 |
II |
0.13 |
9.92 |
2.07 |
1.20 |
1.20 |
-2.05 |
0.18 |
Adsorption Isotherm Data of MGK264 with Sand
|
µg in |
µg in Solution |
|
|
||||
Nominal Concentration |
Replicate |
|
Solution at |
After Adsorption |
µg of Compound |
|||
(ppm) |
Number |
Ce(ppm)b |
Initiation |
Phase |
Adsorbed |
x/m |
ln Ce |
ln x/m |
0.10 |
I |
0.08 |
0.90 |
0.82 |
0.09 |
0.09 |
-2.49 |
-2.46 |
0.10 |
II |
0.08 |
0.90 |
0.84 |
0.06 |
0.06 |
-2.47 |
-2.76 |
0.25 |
I |
0.21 |
2.41 |
2.08 |
0.33 |
0.33 |
-1.56 |
-1.12 |
0.25 |
II |
0.22 |
2.41 |
2.19 |
0.22 |
0.22 |
-1.51 |
-1.53 |
0.50 |
I |
0.44 |
4.83 |
4.36 |
0.47 |
0.47 |
-0.83 |
-0.75 |
0.50 |
II |
0.44 |
4.83 |
4.32 |
0.51 |
0.51 |
-0.83 |
-0.67 |
1.0 |
I |
0.83 |
9.92 |
8.26 |
1.66 |
1.66 |
-0.18 |
0.51 |
1.0 |
II |
0.88 |
9.92 |
8.72 |
1.20 |
1.20 |
-0.13 |
0.19 |
Desorption Data of Sand
Nominal Concentration (ppm) |
Replicate Number |
Ce (ppm)2 |
µg in Solution at Initiation |
µg Removed After Adsorption Phase |
µg in Solution After Desorption Phase |
x/m |
ln Ce |
ln x/m |
0.10 |
I |
0.01 |
0.90 |
0.82 |
0.10 |
0.10 |
-4.53 |
-2.27 |
0.10 |
II |
0.01 |
0.90 |
0.84 |
0.10 |
0.10 |
-4.59 |
-2.30 |
0.25 |
I |
0.02 |
2.41 |
2.08 |
0.23 |
0.23 |
-3.76 |
-1.47 |
0.25 |
II |
0.02 |
2.41 |
2.19 |
0.24 |
0.24 |
-3.72 |
-1.42 |
0.50 |
I |
0.04 |
4.83 |
4.36 |
0.44 |
0.44 |
-3.12 |
-0.81 |
0.50 |
II |
0.05 |
4.83 |
4.32 |
0.54 |
0.54 |
-2.90 |
-0.61 |
0.75 |
I |
0.09 |
9.92 |
8.26 |
0.85 |
0.85 |
-2.46 |
-0.17 |
0.75 |
II |
0.09 |
9.92 |
8.72 |
0.86 |
0.86 |
-2.46 |
-0.16 |
Adsorption Isotherm Data of MGK264 with Sandy Loam
|
µg in |
µg in Solution |
|
|
||||
Nominal |
|
|
Solution |
After |
µg of |
|||
Concentration (ppm) |
ReplicateNumber |
Ce(ppm)2 |
atInitiation |
AdsorptionPhase |
CompoundAdsorbed |
x/m |
1n Ce |
ln x/m |
0.10 |
I |
0.06 |
0.90 |
0.60 |
0.31 |
0.31 |
-2.79 |
-1.18 |
0.10 |
II |
0.06 |
0.90 |
0.61 |
0.29 |
0.29 |
-2.78 |
-1.22 |
0.25 |
I |
0.16 |
2.41 |
1.53 |
0.88 |
0.88 |
-1.86 |
-0.12 |
0.25 |
II |
0.16 |
2.41 |
1.63 |
0.78 |
0.78 |
-1.80 |
-0.25 |
0.50 |
I |
0.32 |
4.83 |
3.05 |
1.78 |
1.78 |
-1.14 |
0.58 |
0.50 |
II |
0.34 |
4.83 |
3.31 |
1.52 |
1.52 |
-1.08 |
0.42 |
1.0 |
I |
0.63 |
9.92 |
5.94 |
3.98 |
3.98 |
-0.46 |
1.38 |
1.0 |
II |
0.69 |
9.92 |
6.62 |
3.30 |
3.30 |
-0.38 |
1.19 |
Desorption Data of Sand
NominalConcentration |
Replicate |
|
µg in Solution at |
µg Removed After Adsorption |
µg in SolutionAfter Desorption |
|
||
(ppm) |
Number |
Ce(ppm)2 |
Initiation |
Phase |
Phase |
x/m |
lnCe |
ln x/m |
0.10 |
I |
0.02 |
0.90 |
0.60 |
0.21 |
0.21 |
-3.82 |
-1.57 |
0.10 |
II |
0.02 |
0.90 |
0.61 |
0.21 |
0.21 |
-3.81 |
-1.54 |
0.25 |
I |
0.05 |
2.41 |
1.53 |
0.51 |
0.51 |
-2.93 |
-0.67 |
0.25 |
II |
0.05 |
2.41 |
1.63 |
0.49 |
0.49 |
-2.97 |
-0.72 |
0.50 |
I |
0.10 |
4.83 |
3.05 |
0.97 |
0.97 |
-2.26 |
-0.03 |
0.50 |
II |
0.11 |
4.83 |
3.31 |
1.03 |
1.03 |
-2.23 |
0.03 |
1.0 |
I |
0.20 |
9.92 |
5.94 |
1.85 |
1.85 |
-1.60 |
0.62 |
1.0 |
II |
0.20 |
9.92 |
6.62 |
2.09 |
2.09 |
-1.61 |
0.74 |
Description of key information
An OECD 106 (Adsorption/desorption using a batch equilibrium method) study is available for MGK 264 in clay loam, silt loam, sand and sandy loam soils.
Only two of the soils fell within the desired adsorption range of 20 to 80% for the Freundlich model. However, the adsorption isotherms for all soil types showed a high degree of linear correlation for a plot of ln (Ce) versus ln (x/m). Correlation coefficients for the adsorption isotherms of soils clay loam, silt loam, sand, and sandy loam were 0.958, 0.999, 0.983, and 0.994, respectively. The correlation coefficients for the adsorption isotherms imply that all of the soils adequately fit the Freundlich model for this compound.
Desorption isotherms were calculated for all soil types. The correlation coefficients for the desorption isotherms determined for soils clay loam, silt loam, sand, and sandy loam were 1.000, 1.000, 1.000, and 0.999, respectively. The correlation coefficients for the desorption isotherms also imply that all of the soils adequately fit the Freundlich model for this compound.
The mean 14C-mass balance of the test compound for clay loam, silt loam, sand, and sandy loam was 101.5, 101.6, 100.3, and 98.9%, respectively. High-performance liquid chromatography was used to test the stability of the test compound under study conditions. The percent of parent compound observed in the adsorption phase was 99.3, 100.0, 98.6, and 98.3% for clay loam, silt loam, sand, and sandy loam, respectively.
Mean Koc over the 4 soils was 1721.25 and 2189 for desorption.
Key value for chemical safety assessment
- Koc at 20 °C:
- 1 721.25
Additional information
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