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Diss Factsheets

Environmental fate & pathways

Additional information on environmental fate and behaviour

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Administrative data

Endpoint:
additional information on environmental fate and behaviour
Type of information:
experimental study
Adequacy of study:
supporting study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
study well documented, meets generally accepted scientific principles, acceptable for assessment

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2010
Report date:
2010

Materials and methods

Principles of method if other than guideline:
Two sampling sites close to Leverkusen City (Germany) were selected to take the surface water samples. The hydrazine concentration in these natural surface waters over time were observed.
GLP compliance:
no
Type of study / information:
stability of hydrazine in surface waters

Test material

Constituent 1
Chemical structure
Reference substance name:
Hydrazine
EC Number:
206-114-9
EC Name:
Hydrazine
Cas Number:
302-01-2
Molecular formula:
H4N2
IUPAC Name:
hydrazine
Details on test material:
hydrazine hydrate, Purity: 100% (according to data of the sponsor)

Results and discussion

Any other information on results incl. tables

Abiotic parameters:

 Parameter   Wet gravel pit   Rhine river
 pH value  8.2* /8.2**  8.1*/8.2**
 O2 [mg/L]  9.7 8.8 
 t [°C]  20.8 20.4 
 [°dH]  7.0 10.3 
 DOC value [mg/L]  2.58 3.00 

* Original pH of surface water, ** pH value after application of test item

- Analysis (mean values of two determinations); nominal hydrazine concentration: 0.025 mg/L

Time [h]  Gravel pit  River Rhine
0  0.0240  0.270
1.5  0.0150  0.0220
 0.0100  0.0185
6  < 0.0100  0.0155
24  < 0.0100  0.0120
48  < 0.0100  < 0.0100

Comments: Limit of quantification of Hydrazine: 0.01 mg/L

- the following DT50 values for the dissipation of hydrazine hydrate in surface water can be derived:

Gravel pit: approximately 2.7 h

River Rhine: approximately 23 h

Applicant's summary and conclusion

Executive summary:

Investigating the stability of hydrazine in two natural surface waters, DT50 values of approximately 2.7 h and 23 h can be observed, respectively (Currenta, 2010).