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Sediment toxicity

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Endpoint:
sediment toxicity: long-term
Type of information:
(Q)SAR
Adequacy of study:
weight of evidence
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
results derived from a valid (Q)SAR model and falling into its applicability domain, with adequate and reliable documentation / justification
Justification for type of information:
QSAR prediction: US EPA accepted QSAR method for chemicals properties assessment.
Qualifier:
according to
Guideline:
other: QSAR model
Principles of method if other than guideline:
EPI Suite v 4.1/ECOSARv1.00
GLP compliance:
no
Remarks:
not applicable. QSAR model
Analytical monitoring:
not required
Vehicle:
no
Test organisms (species):
other: Earthworm
Details on test organisms:
no further information
Study type:
other: QSAR model
Test type:
other: QSAR model
Water media type:
freshwater
Type of sediment:
not specified
Limit test:
no
Duration:
14 d
Exposure phase:
total exposure duration
Hardness:
not applicable to QSAR models
Test temperature:
not applicable to QSAR models
pH:
not applicable to QSAR models
Dissolved oxygen:
not applicable to QSAR models
Salinity:
not applicable to QSAR models
Ammonia:
not applicable to QSAR models
Details on test conditions:
-Name of test material (as cited in study report:Potassium oxide
CAS Number: 12136-45-7
SMILES : KOK
CHEM : Potash (potassium oxide)
MOL FOR: O1 K2
MOL WT : 94.20
Wat Sol: 1E+006 (mg/L, EPISuite WSKowwin v1.43 Estimate)
Reference substance (positive control):
no
Duration:
14 d
Dose descriptor:
LC50
Effect conc.:
887.517 mg/kg sediment dw
Nominal / measured:
not specified
Conc. based on:
not specified
Basis for effect:
other: QSAR model
Details on results:
LC50 (14-day, earthworm)= 887.517 mg/L (ppm)
1 kg of water has a volume of 1 L and the mg/kg and mg/L are the same.
LC50 (14-day, earthworm)= 887.517 mg/kg soil dw

Overview of QSARs estimations on sediment toxicity of  Dipotassium oxide/Potassium oxide

Method

 

Results

Remarks

Reference

QSAR

estimate

LC50 (14-day, earthworm)=887.517 mg/L (ppm)

 

Reliable with restrictions,

QSAR estimated data

ECOSAR Program (v1.00)

 

  

LC50 (14-day, earthworm)= 887.517 mg/L (ppm)

 

Validity criteria fulfilled:
yes
Remarks:
US EPA accepted QSAR method for chemicals properties assessment.
Conclusions:
LC50 (14-day, earthworm)= 887.517 mg/L (ppm)
1 kg of water has a volume of 1 L and the mg/kg and mg/L are the same.
LC50 (14-day, earthworm)= 887.517 mg/kg soil dw
Executive summary:

The ECOSAR QSAR model predicts that 14 -day LC50 value would to be 887.517 mg/L (ppm) for freshwater sediment.

Endpoint:
sediment toxicity: long-term
Data waiving:
other justification
Justification for data waiving:
other:

Description of key information

The ECOSAR QSAR model predicts that 14 -day LC50 value would to be 887.517 mg/L (ppm) for freshwater sediment.
 
The available data for marine water sediment are limited and to obtaine the value for PNECs for saltwaters is taken account a assesment factor 10 to extrapolate to LC50 following the “Guidance on Information Requirement and Chemical Safety Assessment R.10: Characterisation of dose [concentration]- response for environment”and “Table R.10-5 Assessment factors proposed for deriving PNEC water for saltwater for different data sets”, to account for the possibility that greater taxonomic diversity in the marine environment makes it likely that some marine taxa may be more sensitive than the most sensitive freshwater taxa.

Key value for chemical safety assessment

EC50 or LC50 for freshwater sediment:
887.517 mg/kg sediment dw
EC50 or LC50 for marine water sediment:
88.75 mg/kg sediment dw
EC10, LC10 or NOEC for freshwater sediment:
177.5 mg/kg sediment dw
EC10, LC10 or NOEC for marine water sediment:
17.75 mg/kg sediment dw

Additional information

The ECOSAR QSAR model predicts that 14 -day LC50 value would to be 887.517 mg/L (ppm) for freshwater sediment.

 

The available data for marine water sediment are limited and to obtaine the value for PNECs for saltwaters is taken account a assesment factor 10 to extrapolate to LC50 following the “Guidance on Information Requirement and Chemical Safety Assessment R.10: Characterisation of dose [concentration]- response for environment”and “Table R.10-5 Assessment factors proposed for deriving PNEC water for saltwater for different data sets”, to account for the possibility that greater taxonomic diversity in the marine environment makes it likely that some marine taxa may be more sensitive than the most sensitive freshwater taxa.