Registration Dossier

Data platform availability banner - registered substances factsheets

Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Environmental fate & pathways

Phototransformation in water

Currently viewing:

Administrative data

Endpoint:
phototransformation in water
Type of information:
migrated information: read-across based on grouping of substances (category approach)
Adequacy of study:
weight of evidence
Reliability:
2 (reliable with restrictions)

Data source

Reference
Reference Type:
other: Master Thesis
Title:
Unnamed
Year:
2010
Report date:
2010

Materials and methods

Study type:
other: both direct and sensitised photolysis were studied
Principles of method if other than guideline:
Study of photodegradation (5-hr duration) with UV light and catalyst Mn and H2O2 (at 1%). The degradation products phosphate (PO4), ammonium (NH4) and total organic carbon (TOC) were analyzed in order to indirectly verify the cleavage efficiency of the C-P bond and C-N bond.
Also, the influence of the concentration of the catalyst Mn was tested for HDTMP.
GLP compliance:
no

Test material

Constituent 1
Chemical structure
Reference substance name:
[hexane-1,6-diylbis[nitrilobis(methylene)]]tetrakisphosphonic acid
EC Number:
245-781-0
EC Name:
[hexane-1,6-diylbis[nitrilobis(methylene)]]tetrakisphosphonic acid
Cas Number:
23605-74-5
Molecular formula:
C10H28N2O12P4
IUPAC Name:
[hexane-1,6-diylbis[nitrilobis(methylene)]]tetrakisphosphonic acid
Test material form:
not specified

Study design

Analytical method:
other: spectrophotometry
Details on sampling:
The samples were collected after initial 10 minutes, then after 30 minutes and subsequently in an interval of 30 minutes until the end of the study (full duration 5 hours).
Light source:
other: lamp
Light spectrum: wavelength in nm:
200
Relative light intensity:
600
Details on light source:
450 W lamp with wavelength from 200 to 600 nm (Heraeus Noblelight, Germany)
Details on test conditions:
The liquid volume of 350 ml containing phosphonates were exposed to UV light in a reactor with quartz cooling jacket and a 450 W lamp with wavelength from 200 to 600 nm. Concentrations: 100 mg/L, 0.20 mmol of HDTMP were used.

The degradation products phosphate (PO4), ammonium (NH4) and total organic carbon (TOC) were analyzed in order to indirectly verify the cleavage efficiency of the C-P bond and C-N bond.

Also, the influence of the concentration of the catalyst Mn was tested for HDTMP. 40 ml of phosphonate (100 mg/L) were treated with Mn at concentrations, 0.5%, 1%, 2%, 3%, 4%. The solutions were left continuously stirred for 24 hours and NH4 was measured after 1 h, 2 h, 4 h, 8 h and 24 h.
Duration of test at given test condition
Duration:
5 h

Results and discussion

% Degradationopen allclose all
% Degr.:
10.7
Sampling time:
10 min
Test condition:
UV only
% Degr.:
52.7
Sampling time:
300 min
Test condition:
UV only
% Degr.:
58.8
Sampling time:
10 min
Test condition:
UV with Mn
% Degr.:
63.5
Sampling time:
300 min
Test condition:
UV with Mn
% Degr.:
55.8
Sampling time:
10 min
Test condition:
UV with H2O2
% Degr.:
92.5
Sampling time:
300 min
Test condition:
UV with H2O2
% Degr.:
38.2
Sampling time:
10 min
Test condition:
UV with Mn and H2O2
% Degr.:
79.6
Sampling time:
300 min
Test condition:
UV with Mn and H2O2
Dissipation half-life of parent compoundopen allclose all
DT50:
293.3 min
Test condition:
UV only
DT50:
14.9 min
Test condition:
UV in presence of Mn
DT50:
6.7
Test condition:
UV in presence of H2O2
DT50:
18.3
Test condition:
UV in presence of Mn and H2O2

Applicant's summary and conclusion

Validity criteria fulfilled:
not applicable