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EC number: 701-216-4 | CAS number: -
There are no long-term data on the toxicity of DTPMP to terrestrial (soil-dwelling) organisms.
DTPMP and its salts are highly adsorbing to soil and soil mineral substrates. The nature of the adsorption is believed to be primarily due to interaction with inorganic substrate or generalised surface interactions. High adsorption is consistent with similar behaviour seen for the analogues ATMP and HEDP, and other common complexing agents such as EDTA. By reference to findings with other similar substances, the binding occurs very rapidly and is effectively irreversible. For environmental fate purposes in exposure assessment this is assessed as a removal process.
The available evidence for DTPMP and its salts in respect of terrestrial hazard has been considered in the context of the 'soil hazard category' defined in ECHA Guidance (on Information requirements and chemical safety assessment) part R.7c. DTPMP and its salts are considered to be soil Hazard Category 3 due to their high adsorption values and low toxicity to aquatic organisms properties.
According to the soil hazard category 3 approach for screening assessment, the PNECsoil has been calculated from PNECfreshwater on the basis of the equilibrium partitioning method and a confirmatory long term toxicity to terrestrial organisms has been proposed for the DTPMP category:
The study is proposed to be read-across from the analogous substance ATMP sodium salt, a neutralised form of ATMP, and read-across to the DTPMP category members in terms of active acid content. Both substances are aminomethylenephosphonic acids, see Sections 7.0 and 1.4 of the CSR for read-across justifications and category hypothesis. The study is proposed with ATMP instead of DTPMP because:
o ATMP adsorbs slightly more strongly to soil, the soil-water adsorption coefficient (Ksoil-water) is slightly higher for ATMP (~900 m3/m3) than DTPMP (570 m3/m3). This means that in the test there would be a slightly higher fraction in the solid phase than the pore water for ATMP than DTPMP, and
o ATMP has a higher purity profile.
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.
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