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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:
supporting study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
test procedure in accordance with national standard methods with acceptable restrictions

Data source

Referenceopen allclose all

Reference Type:
study report
Title:
Unnamed
Year:
1979
Reference Type:
other company data
Title:
Unnamed

Materials and methods

Principles of method if other than guideline:
Photodegradation was measured for 17-day sunlight exposure to the phosphonate test substance in combination with specific metal ions in purified water.
GLP compliance:
no

Test material

Reference
Name:
Unnamed
Type:
Constituent
Test material form:
not specified

Study design

Light source:
sunlight
Sensitiser (for indirect photolysis)
Type of sensitiser:
water with additives
Details on sensitiser:
ferric, chromic, zinc and cupric nitrate salts

Results and discussion

% Degradationopen allclose all
% Degr.:
7
Sampling time:
17 d
Test condition:
pH 7; test material without sensitisers
Remarks on result:
other: equivalent dark control: 4% degradation
% Degr.:
78
Sampling time:
17 d
Test condition:
pH 7; test material with ferric nitrate. 55% degradation reached by day 3.
Remarks on result:
other: equivalent dark control: 2% degradation.
% Degr.:
70
Sampling time:
17 d
Test condition:
pH 7; test material with cupric nitrate. 55% degradation reached by day 3.
Remarks on result:
other: equivalent dark control: 37% degradation.
% Degr.:
6
Sampling time:
17 d
Test condition:
pH7; test material wtih zinc nitrate or with chromic nitrate.
Remarks on result:
other: equivalent dark control: 0% degradation (both sensitisers).
Transformation products:
yes

Any other information on results incl. tables

% Transformation (Phosphonate to Orthophosphate)

pH;  Day 3; Day 9; Day 17;

HEDP (Light)
 4; 16; 33; 44;
 7;  4;  5;  7;
10;  2;  2;  3;

HEDP (Dark)
 4;  -;  -;  3;
 7;  -;  -;  4;
10;  -;  -;  0;

HEDP/Ferric Nitrate
(Light)
 4; 60; 57; 55;
 7; 55; 75; 78;
10; 61; 76; 78;

HEDP/Ferric Nitrate
(Dark)
 4;   ;   ; 6;
 7;   ;   ; 2;
10;   ;   ; 1;

HEDP/Chromic Nitrate
(Light)
 4;  3;  7; 16;
 7;  2;  3;  6;
10;  2;  4;  6;

HEDP/Chromic Nitrate
(Dark)
 4;   ;   ; 0;
 7;   ;   ; 0;
10;   ;   ; 0;

HEDP/Zinc Nitrate
(Light)
 4; 11; 22; 41;
 7;  2;  4;  6;
10;  2;  4;  6;

HEDP/Zinc Nitrate
(Dark)
 4;   ;   ; 0;
 7;   ;   ; 0;
10;   ;   ; 0;

HEDP/Cupric Nitrate
(Light)
 4; 49; 62; 77;
 7; 55; 68; 70;
10; 62; 70; 67;

HEDP/Cupric Nitrate
(Dark)
 4;   ;   ; 10;
 7;   ;   ; 37;
10;   ;   ;  2;

Applicant's summary and conclusion

Conclusions:
Direct photolysis of Dequest 2001 is not significant.
Sensitised photolysis was observed in the presence of ferric
nitrate and cupric nitrate.