Registration Dossier
Registration Dossier
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EC number: 231-970-5 | CAS number: 7782-91-4
Endpoint summary
Administrative data
Description of key information
Additional information
Sediment compartment:
The amount of (high quality) data that are represented by the FOREGS-dataset, was much larger than the information given in the other studies that were consideed relevant (see Table below). Moreover, the relevance of the Kd-values presented in these studies is questionable. Therefore a Mo-Kd of 1,778 L/kg is proposed for the sediment compartment
Overview of partition coefficient between the water and sediment compartment
Reference
|
Kd-value |
RIVM-reports (Crommentuyn et al, 1997; Lijzen et al, 2001) |
850 (log Kd: 2.93) |
Cook, 2002 |
3,020 (log Kd: 3.48) |
FOREGS-dataset |
1,778 (log Kd: 3.25) |
Suspended particulate material compartment:
An overview of the different relevant Kd,SPM-values that were selected for the derivation of a typical SPM-partition coefficient is given hereunder.
Overview of partition coefficient between the water and suspended particulate material; values in bold were used for the derivation of a typical Kd-value for particulate suspended material
| Reference | Kd,SPM-value (L/kg) | ||
| RIVM-report (Crommentuyn et al, 1997) | 1,122 (log Kd: 3.05) | ||
| Popp and Laquer, 1980 – Rio Grande | 1,738 (log Kd: 3.24) | ||
| Popp and Laquer, 1980 – Rio Puerco | 269 (log Kd: 2.43) | ||
| Popp and Laquer, 1980 – Rio Salado | 155 (log Kd: 2.19) | ||
| Magyar,1993 | 2,000 (log Kd: 3.30) and 2,568 (log Kd: 3.41) ; Average: 2,284 (log Kd: 3.36) | ||
| Neal et al (2000) | 7,918 (log Kd: 3.90) | ||
| Average: | 2,248 (log Kd: 3.35) | ||
As each of these data points represents a specific location, it was decided that the average of these values could be put forward as the typical Kd for suspended particulate material.
Consequently, the derived value of 2,248 L/kg (log Kd of 3.35) is proposed as a typical Mo-Kd for suspended particulate material
Soil compartment:
The log Kd of 2.94 (i.e., 871 L/kg) - as proposed by Crommentuyn et al (1997) - is proposed as a typical Kd for the terrestrial compartment.
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