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EC number: 947-369-2 | CAS number: -
No study of ready biodegradation of potassium salts of HMDTMP are available. 0% removal (based on BOD) was observed in a reliable study conducted using an analogous sodium salt of HMDTMP.
This result is supported by findings in a further reliable test of ready biodegradability, measured with the acid form, showing extremely low levels of biodegradation over 28 days.
Two studies of inherent biodegradation are also available for the acid form. Both show significant but highly variable levels of removal over the test period, probably due to adsorption combined with slow abiotic and biotic degradation mechanisms.
In dilute aqueous conditions of defined pH, a salt will behave no differently to the parent acid, at identical concentration of the particular speciated form present, and will be fully dissociated to yield HMDTMP phosphonate anion and Na+(or K+). Binding behaviour is not affected by acid or alkali metal salt form. Hence some properties (measured or expressed in aqueous media) for a salt can be directly read across (with suitable mass correction) to the parent acid and vice versa, or from one salt form to another (here, sodium salt to potassium salt) (see CSR section 1 for mass correction values). In the present context the effect of the alkaline metal counter-ion (sodium/potassium) will not be significant and has been extensively discussed in the public literature. In biological systems and the environment, polyvalent metal ions will be present, and the phosphonate ions show very strong affinity to them.
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