Registration Dossier
Registration Dossier
Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.
The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.
Use of this information is subject to copyright laws and may require the permission of the owner of the information, as described in the ECHA Legal Notice.
EC number: 233-267-9 | CAS number: 10102-18-8
Endpoint summary
Administrative data
Description of key information
Additional information
An overview of background and ambient selenium concentrations in the environment was made based on monitoring data in order to determine the typical background and reasonable worst case ambient concentration of selenium in water, sediment, soil and air for the EU-27 and Norway (see attached report for details). Only data from high quality international monitoring programs (FOREGS Geochemical Baseline Mapping Program and GEMAS, EuroGeoSurveys geochemical mapping of agricultural and grazing soils) were included and no specific search for Se monitoring data in from other datasets was carried out.
The natural background concentration is the natural concentration of an element in the environment that reflects the situation before any human activity disturbed the natural equilibrium (e.g., the situation a few thousands year ago). Because of historical and current anthropogenic input from diffuse sources, the direct measurement of natural background concentrations is not feasible in the European environment. As an alternative, baseline background concentration are measured. This is the concentration of an element in the present or past corresponding to very low anthropogenic pressure (i.e., close to the natural background). Ambient concentrations are defined as the sum of the natural background of an element with diffuse anthropogenic input in the past or present (i.e., influence of point sources not included). Reasonable worst-case (RWC) ambient concentration levels are used for the regional risk assessment (regional PEC).
| Compartment | Unit | Typical median baseline background concentration | Reasonable worst case ambient concentration |
| Fresh surface water | µg Se/L | 0.32 | 0.85a |
| Marine water | µg Se/L | 0.085 | no data |
| Freshwater sediment | mg Se/kg dw | 0.1b | 0.27b |
| Agricultural soil (0 -20 cm) | mg Se/kg dw | 0.35 | 0.59c |
| Grazing land (0 -10 cm) | mg Se/kg dw | 0.40 | 0.71c |
| Air | ng Se/m3 | no data | no data |
a based on the median of country-specific 90th percentile of baseline selenium concentrations in surface water (data from FOREGS)
b based on the data for surface water and the equilibrium partitioning approach
c based on the median of country-specifc 90th percentiles for EU-27 and Norway (data from GEMAS)
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
