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EC number: 231-838-7 | CAS number: 7758-29-4
Adsorption / desorption
Administrative data
Link to relevant study record(s)
Description of key information
Key study: Blanchar RW and Hossner LR (1969)
The data show that sodium tripolyphosphate was strongly adsorbed. An estimate of the extent of hydrolysis during the sorption study was made by determining the phosphate content of the solution phase of the most concentrate sample.
Although considerable hydrolysis of TPP had taken place, an approximation of the sorption capacities were determined from the Langmuir adsorption isotherm.
The sorption capacity was 706 µg P/g soil
Key value for chemical safety assessment
- Koc at 20 °C:
- 142.44
Additional information
The sorption capacity is equal to the amount of test substance (µg) adsorbed/amount of sorbent (g) at equilibrium
The Freundlich adsorption coefficient (Kf) is the log of this value
Koc=Kf/foc(µg/g)
Sorption capacity = 706
Kf = 2.85
focsoil = 0.02
Koc=2.85/0.02
Therefore Koc = 142.44 µg/g
Log Koc = 2.15Information 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.
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