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Environmental fate & pathways

Phototransformation in water

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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 photodegration (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

Reference
Name:
Unnamed
Type:
Constituent
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