Use of this information is subject to copyright laws and may require the permission of the owner of the information, as described in the ECHA Legal Notice.
EC number: 701-216-4 | CAS number: -
Photodegradation in water (DTPMP-H, CAS 15827-60-8): 4 - 91% transformation (phosphonate to orthophosphate) after 17 days under a range of conditions.
Two studies are available focussing on stability in water due to photodegradation mechanisms. Whilst this is not a conventional pathway for study it brings useful evidence for environmental fate in the real environment.
Photodegradation of DTPMP-H (15827-60-8) in water was examined (Saeger, Monsanto (undated, believed to be 1979), reliability 2). 14% transformation (phosphonate to orthophosphate) was measured after 17 days at pH 7 (4% at pH 4 and 10). Levels of degradation in the presence of ferric nitrate were higher, with 36% transformation by day 3 in the presence of ferric nitrate at pH 7 (by day 17: 70% at pH 7, 91% at pH 4 and 47% at pH 10). The effect of other metals (chromic, zinc and cupric ions) was insignificant.
In a separate test, half-lives less than 1 hour were measured in water at pH 3, pH 5-6 and at pH 10, irradiated by a middle pressure mercury lamp emitting between 190 and 600 nm. Half-lives were found to be shorter in the presence of iron ions at environmentally relevant concentrations.
Degradation in the presence of ferric (Fe III) ions reflects the ability of that ion to absorb light, and because it can be strongly complexed by DTPMP, that energy can be transferred to the complexing anion, resulting in degradation. It is possible that ferrous (Fe II) ions would be formed in this process, and, due to the presence of oxygen, ferric ions would be regenerated.
The degradation product identified in this study is orthophosphate. No specific reaction pathway is proposed by the study authors.
Discussion of trends in the DTPMP category
Photodegradation in the presence of common metal ions has been observed. Based on evidence from a number of studies members of this group are considered to be partially degradable over short time periods, and with evidence of mineralisation, particularly in the light, over longer periods.
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.
Welcome to the ECHA website. This site is not fully supported in Internet Explorer 7 (and earlier versions). Please upgrade your Internet Explorer to a newer version.
Close Do not show this message again