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Environmental fate & pathways

Phototransformation in water

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Reference
Endpoint:
phototransformation in water
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
study well documented, meets generally accepted scientific principles, acceptable for assessment
Remarks:
Test was not performed under GLP and not according to standard guidelines.
Study type:
direct photolysis
Principles of method if other than guideline:
Method: other (measured)
GLP compliance:
no
Radiolabelling:
no
Analytical method:
other: Dr. Lange LCK 310/343 cuvette test kit
Details on sampling:
Samples were taken on day: 0, 1, 2, 3, 6, 7, 13, 17, 24, 50 and 70
Buffers:
No buffers sued
Light source:
sunlight
Details on test conditions:
Test solutions were prepared in:
- demineralised water (demi water) (ex-pilot plant) pH 6.9 (carbon dioxide free)
- tap water, drinking water from the community system obtained via the intermediate storage tank. pH 7.9.
- river water, water taken from the river Schipbeek about 500 m before the entrance in the river IJssel. Filtered before use. pH 7.6.

A known amount of Halamid was dissolved in demi water in such a way that a stock solution of 1500 mg/l was obtained. Using this stock solutions the test solutions were prepared.
Test solution D.D.
10.0 ml of stock solution was transferred quantitatively into a 1000 ml volumetric flask. The solution was made up to mark with demi water and mixed. The flask was completely covered with aluminum foil and placed in a cup-board at room temperature. pH at T0 was 9.3.
Test solution D.L.
Same procedure as for D.D. The flask as such was placed on a bench before the window. It was standing in direct day light during the whole day. pH at T0 was 9.3.
Test solution T.L.
Same procedure and conditions as D.L. However tap water was used to make up the solution. pH at T0 was 7.9.
Test solution R.L.
Same procedure and conditions as D.L. However river water was used to make up the solution. pH at T0 was 7.6.
Duration:
70 d
Temp.:
20 °C
Initial conc. measured:
15 mg/L
Reference substance:
no
Dark controls:
yes
Remarks:
in demineralized water
% Degr.:
72.7
Sampling time:
70 d
Test condition:
Direct photolysis, demineralized water
% Degr.:
92
Sampling time:
70 d
Test condition:
Direct photolysis, tap water
% Degr.:
98.7
Sampling time:
70 d
Test condition:
Direct photolysis, river water
DT50:
2 mo
Transformation products:
not measured

Demin-water dark : 15 mg/l in demin-water in the dark
remains stable for a long period. 1.5 mg/l activity loss in
two month period. Test performance was static.
Demin-water light : 15 mg/l in direct sunlight was not
stable, and a loss of 11 mg/l in two month period was
evident.

Validity criteria fulfilled:
not applicable
Conclusions:
Chloramine T is stable in the dark, but not in sunlight.
Executive summary:

Solutions of Tosylchloramide sodium  in river water, tap-water and demi water were prepared, The change in substance content in time was followed using the Dr. Lange LCK 310/343 cuvette test kit. The influence of sunlight on the stability was also tested.

Description of key information

The stability of Tosylchloramide sodium at 15 mg/l was determined in river water, tap-water and demi water for a period of 70 days at 20 degrees celsius. Measurements were based on Dr. Lange cuvette tests (Dr.Lange, Kesteren, The Netherlands). Total chlorine and combined chlorine were measured. The influence of sunlight on the stability was also tested. Tosylchloramide sodium at 15 mg/l was determined in demi water, in the dark and in direct sunlight (natural) at room temperature. Flasks in the dark were covered with alumium foil. Biodegradation of Tosylchloramide sodium in river water, tap-water and demi water were 98.7, 92 and 72.7% respectively. The latter result is considered to be more reliable due to a loss of product in tap and river water most likely due to (dissolved) organic matter and not to photolysis. Under direct sunlight Tosylchloramide sodium was not stable, and a loss of 11 mg/l during a two month period was observed.

Key value for chemical safety assessment

Half-life in water:
2 mo

Additional information