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Sediment toxicity

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Endpoint:
sediment toxicity: long-term
Type of information:
experimental study
Adequacy of study:
supporting study
Study period:
October 02 - November 12, 1992
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: GLP Guideline study
Principles of method if other than guideline:
other: proposed method for Sediment Toxicity Test developed by BBA/IVA ad hoc Working Group "Sediment Toxicity Tests" (Jan. 1992)
GLP compliance:
yes
Analytical monitoring:
yes
Details on sediment and application:
The spiking of the water was set up as follows:
From a stock solution the calculated volume for each concentration were applied to the water column of the test vessels just below the water surface by using a pipette and gently mixing to ensure homogeneous distribution without disturbing the sediment.
Test organisms (species):
Chironomus riparius
Study type:
laboratory study
Test type:
static
Water media type:
freshwater
Type of sediment:
natural sediment
Duration:
41 d
Exposure phase:
total exposure duration
Duration:
41 d
Dose descriptor:
NOEC
Effect conc.:
> 4 mg/L
Nominal / measured:
nominal
Conc. based on:
act. ingr.
Basis for effect:
emergence rate
Endpoint:
sediment toxicity: long-term
Type of information:
experimental study
Adequacy of study:
key study
Study period:
March 17 - April 7, 1993
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: GLP Guideline study
Qualifier:
according to guideline
Guideline:
ASTM E1383 (Sediment Toxicity Test (Media: Sediment-freshwater))
Version / remarks:
94
GLP compliance:
yes
Analytical monitoring:
yes
Details on sediment and application:
The spiking of the water was set up as follows:
From a stock solution the calculated volume for each concentration were applied to the water column of the test vessels just below the water surface by using a glass pipet or microliter syringe. The compound was mixed into the water column by the gentle aeration in all vessels.
Test organisms (species):
Hyalella azteca
Study type:
laboratory study
Test type:
static
Water media type:
freshwater
Type of sediment:
natural sediment
Duration:
21 d
Exposure phase:
total exposure duration
Duration:
21 d
Dose descriptor:
LC50
Effect conc.:
0.42 mg/L
Nominal / measured:
meas. (initial)
Conc. based on:
act. ingr.
Basis for effect:
mortality
Remarks on result:
other: 95% CL: 0.29 - 0.61, calculated value from mean concentration
Duration:
21 d
Dose descriptor:
NOEC
Effect conc.:
0.06 mg/L
Nominal / measured:
meas. (initial)
Conc. based on:
act. ingr.
Basis for effect:
mortality
Remarks on result:
other: mean concentration
Duration:
21 d
Dose descriptor:
LOEC
Effect conc.:
0.56 other: mg/L
Nominal / measured:
meas. (initial)
Conc. based on:
act. ingr.
Basis for effect:
mortality
Remarks on result:
other: mean concentration
Reported statistics and error estimates:
LC50: The Statistical Method was "Moving Average" (Stephen et al.)

Description of key information

Hyallella azteca: NOEC (mortality) = 0.06 mg a.i./L

Key value for chemical safety assessment

Additional information

Two reliable chronic sediment toxicity tests with two different species with different living and feeding conditions using spiked water are available for diuron. The study with the midge Chironomus riparius (Heimbach, 1993) was carried out according to a proposed method for a Sediment Toxicity Test developed by BBA/IVA ad hoc Working Group "Sediment Toxicity Tests" (Januar 1992). The resulting NOEC (emergence) value for this water/sediment-system was >4 mg a.i./L diuron. Gagliano & Bowers (1993) performed a Sediment Toxicity Test with Hyalella azteca according to ASTM E1383 -94 and found a NOEC (mortality) of 0.06 mg a.i./L (initial mean measured concentration) based upon no statistically significant difference in survivability and growth at this concentration compared to the control.