Registration Dossier
Registration Dossier
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EC number: 220-971-6 | CAS number: 2950-43-8
Adsorption / desorption
Administrative data
Link to relevant study record(s)
Description of key information
Adsorption to solid soil phase is not expected.
Key value for chemical safety assessment
Additional information
Summary according the adsorption potential as given in EU-RAR draft, 14. May 2008
Since data for the test substance hydroxylamine-O-sulphonic acid (CAS 2950-43-8) are not available, information on the surrogate substance bis(hydroxylammonium) sulfate (CAS 10039-54-0) are used in a reliable read-across approach to evaluate the test substance.
Due to the specific properties of the surrogate substance it can be expected that the adsorption to organic matter is negligible.
Although the QSARs for adsorption estimation are not valid for inorganic substances, an approximate estimation was carried out using the QSAR for Nonhydrophobics from the TGD and the measured partition coefficient octanol/water. Using this correlation, a Koc of 0.141 l kg-1 was estimated indicating a very low adsorption to organic matter. Further partition coefficients (Kp) where derived from this Koc for various compartments by using the generic values given in the TGD for organic carbon contents of soils and sediments.
Table. Estimation of partition coefficients
| Compartments | Partition coefficients (l/kg) |
| soil-water | Kp _soil = 2.812 x 10-3 |
| sediment-water | Kp _sed = x 10-3 |
| suspended matter-water | Kp _susp = 0.014 |
| activated sludge-water | Kp _sludge = 0.052 |
Reference:
ECB (2008). EU-RAR Draft, Bis-(hydroxylammonium)sulphate, CAS: 10039 -54 -0,14. May 2008
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