Barium oxide, obtained by calcining witherite

Adsorption / desorption

Administrative data

Endpoint:

adsorption / desorption

Remarks:

adsorption/desorption

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: Information contained i a peer-reviewed publication edited by a National Public Institute

Data source

Reference

Reference 1

Reference Type:

review article or handbook

Title:

Unnamed

Year:

1997

Reference 2

Reference Type:

publication

Title:

Unnamed

Year:

1992

Reference 3

Reference Type:

publication

Title:

Trace metal transport and partitioning in the suspended sediments of the Rio Grande and tributaries in Central New Mexico

Author:

Popp and Laquer

Year:

1980

Bibliographic source:

Chemosphere, 9: 89-98, 1980

Reference 4

Reference Type:

publication

Title:

Desorption and coagulation of trace elements during estuarine mixing

Author:

Li et al.

Year:

1984

Bibliographic source:

Geochimica et Cosmochimica Acta, 48: 1879-1884 (1984)

Materials and methods

Principles of method if other than guideline:

Partition coefficients between particulate matter and water derived using measurements in 4 location in the Netherlands. Partition coefficients between soil and water based on batch experiments. Partition coefficients between sediment and water estimated on the basis of partition coefficients between particulate matter and water.

GLP compliance:

not specified

Test material

Test material information

Constituent 1

Reference substance name:

Barium

EC Number:

231-149-1

EC Name:

Barium

Cas Number:

7440-39-3

IUPAC Name:

barium

Results and discussion

Partition coefficients

Partition coefficients 1

Phase system:

suspended matter-water

Type:

log Kp

Value:

3.13

Remarks on result:

other: Value derived by Bockting et al. (1992) using measurements in fresh surface water samples of 4 locations in the Netherlands from 1983-1986 and data from Popp and Laquer (1980) and Li et al. (1984), in North American rivers

Partition coefficients 2

Phase system:

soil-water

Type:

log Kp

Value:

1.78

Remarks on result:

other: Value based on literature study using batch experiments (Bockting et al., 1992)

Partition coefficients 3

Phase system:

sediment-water

Type:

log Kp

Value:

3

Remarks on result:

other: Estimated value on the basis of partition coefficientsbetween particulate matter and water (Stortelder et al., 1989)

Any other information on results incl. tables

All log-values are based on the Kp in L/kg. The values for soil and sediment are expressed as a value in standard soil/sediment (containing 10% organic matter and 25% of clay).