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Environmental fate & pathways

Adsorption / desorption

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Endpoint:
adsorption / desorption: screening
Type of information:
experimental study
Adequacy of study:
supporting study
Study period:
1995-09-13 - 1996-05-23
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
study well documented, meets generally accepted scientific principles, acceptable for assessment
Remarks:
only a range for kd available, limited data
Reason / purpose for cross-reference:
reference to same study
Qualifier:
according to guideline
Guideline:
other: DoE Toxicity Tests in Support of Enviornmental Quality Standards
Version / remarks:
Final Report DoE 3460(P), S Vine & M Crane
Deviations:
yes
GLP compliance:
yes
Type of method:
HPLC estimation method
Media:
sediment
Specific details on test material used for the study:
SOURCE OF TEST MATERIAL
- Source and lot/batch No.of test material: V840-413
- Expiration date of the lot/batch: July 1996
- Purity: 100.43%

RADIOLABELLING INFORMATION (if applicable)
- Radiochemical purity: 99.2%
- Specific activity: 26.85 MBq
- Locations of the label: 14C
- Expiration date of radiochemical substance: 29 May 1996

STABILITY AND STORAGE CONDITIONS OF TEST MATERIAL
- Storage condition of test material: radiolabelled test susbtance at approximately -20 °C
Radiolabelling:
yes
Analytical monitoring:
yes
Details on sampling:
SEDIMENT
- Concentrations: sediments were extracted using methanol (100 mL)
- Sampling interval: one day before the start (addition of the larvae) and days 0, 1, 4, 7, 14, 17 (test end)
- Sample storage before analysis: not indicated

OVERLYING WATER
- Concentrations: 1 mL aliquots of test medium were taken from the test vessels
- Sampling interval: daily
- Sample storage before analysis: not indicated
Matrix no.:
#1
Matrix type:
sandy loam
% Org. carbon:
2.3
Details on matrix:
COLLECTION AND STORAGE
- Geographic location: Millstream pond (a site known to be free of contamination)
- Collection procedures: the sediment was diluted with silversand to give an organic carbon content of approximately 3.76% (organic matter content of 6.48%)
- Storage conditions: complete darkness at approximately 4 °C
- Soil preparation (e.g.: 2 mm sieved; air dried etc.):

PROPERTIES
- Soil texture
- 11.2 % < 2µm
3.0%: 2-6 µm
4.0%: 6-20 µm
5.3%:20-63 µm
66.3%: 63-212 µm
9.7%: 212 and 600 µm
Sample No.:
#1
Phase system:
sediment-water
Type:
other: Kd
Remarks:
mean kd from two replicates
Value:
202 L/kg
Remarks on result:
other: nominal concentration added: 0.25 mg/L
Sample No.:
#2
Phase system:
sediment-water
Type:
other: Kd / mean from two replicates
Value:
158 L/kg
Remarks on result:
other: nominal concentration added: 2.5 mg/L
Sample No.:
#3
Phase system:
sediment-water
Type:
other: Kd / mean from two replicates
Value:
105 L/kg
Remarks on result:
other: nominal concentration added: 25 mg/L
Sample No.:
#4
Phase system:
sediment-water
Type:
other: Kd / mean from two replicates
Value:
66 L/kg
Remarks on result:
other: nominal concentration added: 250 mg/L
Transformation products:
not measured
Conclusions:
The Kd (sediment: water equilibrium constant) of imazalil was estimated using the HPLC method. A range of Kd values from 66 to 202 L/Kg was determined.
Endpoint:
adsorption / desorption: screening
Type of information:
calculation (if not (Q)SAR)
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)
Qualifier:
no guideline available
Principles of method if other than guideline:
Based on calculation method
Type of method:
other: calculation method
Matrix no.:
#1
Matrix type:
sand
% Org. carbon:
0.821
pH:
4
Matrix no.:
#2
Matrix type:
sandy loam
% Org. carbon:
4.35
pH:
6.7
Matrix no.:
#3
Matrix type:
silt loam
% Org. carbon:
1.914
pH:
5.1
Matrix no.:
#4
Matrix type:
silt loam
% Org. carbon:
2.436
pH:
7
Matrix no.:
#5
Matrix type:
sand
% Org. carbon:
0.07
pH:
4.1
Matrix no.:
#6
Matrix type:
loamy sand
% Org. carbon:
3.85
pH:
4.3
Matrix no.:
#7
Matrix type:
sandy loam
% Org. carbon:
4.39
pH:
6.7
Matrix no.:
#8
Matrix type:
loam
% Org. carbon:
2.71
pH:
7
Matrix no.:
#9
Matrix type:
silt loam
% Org. carbon:
2.7
pH:
5.8
Matrix no.:
#10
Matrix type:
Silt
% Org. carbon:
2.42
pH:
6.1
Matrix no.:
#11
Matrix type:
silty clay loam
% Org. carbon:
3.25
pH:
7.4
Matrix no.:
#12
Matrix type:
silt loam
% Org. carbon:
5.01
pH:
7.2
Sample No.:
#1
Type:
Koc
Value:
4 704 L/kg
pH:
4
Matrix:
sand
% Org. carbon:
0.821
Sample No.:
#2
Type:
Koc
Value:
3 543 L/kg
pH:
6.7
Matrix:
sandy loam
% Org. carbon:
4.35
Sample No.:
#3
Type:
Koc
Value:
8 150 L/kg
pH:
5.1
Matrix:
silt loam
% Org. carbon:
1.914
Sample No.:
#4
Type:
Koc
Value:
5 532 L/kg
pH:
7
Matrix:
silt loam
% Org. carbon:
2.436
Sample No.:
#5
Type:
Koc
Value:
4 152 L/kg
pH:
4.1
Matrix:
sand
% Org. carbon:
0.07
Sample No.:
#6
Type:
Koc
Value:
2 080 L/kg
pH:
4.3
Matrix:
loamy sand
% Org. carbon:
3.85
Sample No.:
#7
Type:
Koc
Value:
3 134 L/kg
pH:
6.7
Matrix:
sandy loam
% Org. carbon:
4.39
Sample No.:
#8
Type:
Koc
Value:
6 918 L/kg
pH:
7
Matrix:
loam
% Org. carbon:
2.71
Sample No.:
#9
Type:
Koc
Value:
6 951 L/kg
pH:
5.8
Matrix:
silt loam
% Org. carbon:
2.7
Sample No.:
#10
Type:
Koc
Value:
4 537 L/kg
pH:
6.1
Matrix:
silt
% Org. carbon:
2.41
Sample No.:
#11
Type:
Koc
Value:
3 436 L/kg
pH:
7.4
Matrix:
silty clay loam
% Org. carbon:
3.25
Sample No.:
#12
Type:
Koc
Value:
3 901 L/kg
pH:
7.2
Matrix:
silt loam
% Org. carbon:
5.01
Validity criteria fulfilled:
yes
Conclusions:
The mobility of imazalil in soil was evaluated and vere investigated in 12 soils. The resulting Koc werein range of 2080 to 8150 l/K with an arithm mean of 4753 l/kg, indicating a high immobility in soil.

Description of key information

The mobility of imazalil in soil was evaluated during the active substance renewal. Those Koc values can be taken over for imazalil sulphate. The resulting Kfoc values were in the range of 2080 to 8150 L/Kg, indicating a high immobility in soil.

In a sediment test, using imazalil sulphate, a range of Kd values were determined (66 -202 l/kg).

Key value for chemical safety assessment

Koc at 20 °C:
4 753

Other adsorption coefficients

Type:
log Kp (solids-water in sediment)
Value in L/kg:
1.8
at the temperature of:
20 °C

Additional information