Registration Dossier
Registration Dossier
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EC number: 201-782-8 | CAS number: 87-90-1
Adsorption / desorption
Administrative data
Link to relevant study record(s)
- Endpoint:
- adsorption / desorption
- Remarks:
- adsorption
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- study well documented, meets generally accepted scientific principles, acceptable for assessment
- Principles of method if other than guideline:
- The purpose of the study was to characterize the adsorption of cyanuric acid (CYA) on soils. The soil adsorption experiments followed the procedure in Method ES-79-M-19 (PR Michael and RG Kaley 'A method for the determination of soil/water partition coefficients' ES-79-M-19.
- GLP compliance:
- no
- Media:
- soil
- Radiolabelling:
- yes
- Type:
- Koc
- Value:
- ca. 51
- Adsorption and desorption constants:
- Results are provided in table 1
- Validity criteria fulfilled:
- not applicable
- Conclusions:
- The cyanuric acid soil/water partition coefficient, K, was less than 1 for all soils, indicating that cyanuric acid is weakly adsorbed and highly mobile in soils.
- Endpoint:
- adsorption / desorption: screening
- Data waiving:
- other justification
- Justification for data waiving:
- other:
- Endpoint:
- adsorption / desorption: screening
- Data waiving:
- other justification
- Justification for data waiving:
- other:
Referenceopen allclose all
Table 1: Soil partition coefficient of cyanuric acid
Koc* |
% relative standard deviation |
Soil |
% Organic carbon |
Classification |
20 |
3.6 |
Ray |
0.70 |
1 |
150 |
9.2 |
Lintonia |
0.41 |
2 |
8 |
13 |
Spinks |
1.39 |
1 |
24 |
9.8 |
Drummer |
1.97 |
1 |
*Koc is not an appropriate partition coefficient for cyanuric acid because it is ionizable under environmental conditions and has a relatively high aqueous solubility. Cyanuric acid should be considered highly mobile in soils and not strongly adsorbed.
Description of key information
An adsorption study conducted in 4 soil types.
Key value for chemical safety assessment
- Koc at 20 °C:
- 51
Additional information
The adsorption of cyanuric acid in 4 different soil types was studied (Michael and Cummings 1982) The soil / water coefficient, K was determined to be <1 for all soils, therefore, cyanuric acid is weakly adsorbed and highly mobile in all soils. Cyanuric acid also has a Log Kow = - 1.31 and therefore, has a low potential for adsorption.
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