Registration Dossier

Environmental fate & pathways

Adsorption / desorption

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Administrative data

Endpoint:
adsorption / desorption, other
Remarks:
monitoring data in water and sediment
Type of information:
other: Calculation of Kp values based on environmental field data
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: see 'Remark'
Remarks:
Kp-values are based on reliable field data of concentration levels in water and sediment; no standard guideline test was conducted to generate Kp-values. Kp-values are calculated based on the hypothesis that equilibrium exists between the baseline levels in water and in sediment.

Data source

Referenceopen allclose all

Reference Type:
publication
Title:
Unnamed
Year:
2005
Report Date:
2005
Reference Type:
study report
Title:
Unnamed
Year:
2018
Report Date:
2018

Materials and methods

Test guideline
Qualifier:
no guideline followed
Principles of method if other than guideline:
Evaluation of high quality environmental geochemical data for Europe, which is provided by the Forum of European Geological Surveys (FOREGS), with respect to cesium (Cs) concentrations in stream water and stream sediment. Baseline levels of cesium in water and sediment were determined in 728 paired sample locations. Assuming equilibrium between both environmental compartments, site-specific partitioning coefficients (Kp) were derived.
GLP compliance:
no
Type of method:
other: field data of baseline levels in water and sediment
Media:
sediment

Test material

Reference
Name:
Unnamed
Type:
Constituent
Details on test material:
naturally occuring cesium
Radiolabelling:
no

Study design

Test temperature:
environmental relevant temperatures

Batch equilibrium or other method

Analytical monitoring:
yes
Details on sampling:
FOREGS:
-The FOREGS sampling grid was based on GTN grid cells developed for Global Geochemical Baseline mapping. This grid divides the entire land surface into 160 km x 160 km cells covering an area of 4,500,000 km2.
- Sampling methodology, preparation and analysis are described by Salminen et al. (2005).
- A total of 807 stream water samples and 888 sediment samples were processed in the FOREGS-program, including 740 paired samples, i.e. samples with the same coordinates for the sampling location of stream water and sediment that are summarised below. However, Cs concentrations in 12 stream water samples (3 from Albania and 9 from Switzerland) were excluded from the analysis, resulting in a total of 728 paired samples summarised below.
- High quality and consistency of the obtained data were ensured by using standardised sampling methods and by treating and analysing all samples in the same laboratory of each country.

Results and discussion

Partition coefficients
Key result
Phase system:
sediment-water
Type:
log Kp
Value:
5.7 L/kg
Remarks on result:
other: European 50th percentile log Kp

Results: Batch equilibrium or other method

Adsorption and desorption constants:
The monitoring stream water and sediment data show that Cs concentrations of sediments range from 0.5 to 68 mg/kg, while dissolved Cs concentrations in the water column of European stream waters range from 0.001 to 24.30 µg/L, showing a comparable higher portion of cesium to be present in sediments under envionmental conditions. Regarding the partitioning of cesium in the water column, stream water/sediment partition coefficients range from 123.463 to 47,000,000 L/kg. Since FOREGS sampled on a grid aiming to equally represent geochemical baseline concentrations across Europe, the 50th percentile log Kp for cesium across Europe was determined to be 5.70 L/kg.

Any other information on results incl. tables

Table 1: Concentrations of cesium in sediment and water and resulting partition coefficients

 

Concentration

Concentration

Partitioning (Kp)

Log Kp

Parameter

Cs (sediment)

Cs (water)

Cs (sed / water)

Cs (sed / water)

#

740

728

740

 

740

728

740

728

mg/kg

µg/L

L/kg

L/kg

Min

0.50

0.001

123.46

2.09

Max

68.00

24.30

47,000,000.00

7.67

Mean

5.24

5.20

0.07

1,107,788.54

1,104,103.92

5.68

STD

6.26918881

6.22

0.94

0.95

2,380,009.74

2,380,688.15

0.61

5th percentile

2

2.00

0.001

43,478.26

43,816.43

4.64

Median

3

3.00

0.01

500,000.00

5.70

90 th percentile

10

10.00

0.05

2,333,333.33

2,255,555.56

6.37

6.35

95th percentile

15

15.00

0.09

3,341,666.67

3,000,000.00

6.52

6.48

1Values from Switzerland and Albania are not included.

Table 2: Country-specific stream water/sediment partition coefficients (given as log Kp in L/kg)

Country

# of data

Area (km2)

Min

Max

Mean

5th P

50th P

90th P

95th P

AL

3

28.75

5.70

6.85

6.44

5.81

6.78

6.83

6.84

AT

20

83.88

3.85

6.48

5.54

4.48

5.67

6.19

6.35

BE

5

32.55

4.96

6.12

5.65

5.07

5.70

6.04

6.08

CH

9

41.29

4.58

5.85

5.29

4.65

5.47

5.65

5.75

CZ

10

78.87

4.66

6.43

5.62

4.88

5.60

6.13

6.28

DE

66

357.12

3.87

7.13

5.60

4.58

5.70

6.30

6.30

DK

0

43.10

n.a.

n.a.

n.a.

n.a.

n.a.

n.a.

n.a.

EE

11

45.23

5.22

6.70

5.84

5.23

5.78

6.30

6.50

ES

83

504.65

4.47

7.34

5.93

4.67

6.00

6.78

6.97

FI

63

338.14

4.68

6.40

5.53

5.07

5.48

6.00

6.00

FR

118

543.97

4.33

6.59

5.62

4.83

5.61

6.31

6.43

GR

26

131.96

4.57

6.70

6.03

5.25

6.30

6.30

6.53

HR

10

56.54

5.52

6.90

6.36

5.77

6.30

6.85

6.88

IE

10

70.27

4.34

6.30

5.79

4.91

5.88

6.23

6.27

IT

45

301.34

2.09

6.60

5.31

3.86

5.52

6.14

6.44

LT

14

64.59

5.48

6.30

5.92

5.56

5.94

6.22

6.25

LV

7

65.30

5.82

6.00

5.90

5.82

5.82

6.00

6.00

NL

9

41.526

5.22

6.12

5.51

5.25

5.46

5.71

5.92

NO

58

323.76

4.26

6.78

5.38

4.61

5.34

6.00

6.30

PL

56

312.69

4.63

6.60

5.93

5.08

6.00

6.48

6.48

PT

19

92.35

5.05

7.67

6.17

5.29

6.20

6.82

7.07

SE

20

449.96

4.42

6.30

5.02

4.47

4.96

5.53

5.64

SK

15

49.03

4.18

6.40

5.79

4.81

6.00

6.22

6.27

SL

4

20.25

6.22

6.54

6.34

6.23

6.30

6.47

6.51

UK

59

219.33

3.54

6.56

5.69

4.89

5.82

6.18

6.30

Applicant's summary and conclusion

Conclusions:
Reliable baseline levels of cesium in pristine water/sediment samples were determined in 728 samples. Sampling and analytical procedures are considered adequate and resulted in reliable data. Assuming equilibrium between the typical concentration in water and sediment, relevant log Kp-values were generated. Data are therefore considered useful for the determination of a relevant log Kp for the sediment compartment. Since FOREGS sampled on a grid aiming to equally represent geochemical baseline concentrations across Europe, the 50th percentile concentrations of cesium across Europe were 3 mg/kg sediment and 0.01 mg/L stream water, respectively, yielding a log Kp for cesium across Europe of 5.70.