(4-carboxybutyl)triphenylphosphonium bromide

Biodegradation in water: screening tests

Administrative data

Endpoint:

biodegradation in water: ready biodegradability

Type of information:

(Q)SAR

Adequacy of study:

key study

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:

1. SOFTWARE
- Calculation based on BIOWIN v4.10, Estimation Programs Interface Suite™ for Microsoft® Windows v 4.10. US EPA, United States Environmental Protection Agency, Washington, DC, USA.
2. MODEL (incl. version number)
- BIOWIN v4.10
3. SMILES OR OTHER IDENTIFIERS USED AS INPUT FOR THE MODEL
- CAS: 17814-85-6
4. SCIENTIFIC VALIDITY OF THE (Q)SAR MODEL
- see "Any other information on materials and methods incl tables"
5. APPLICABILITY DOMAIN
- Descriptor domain:
The substance has a molecular weight of 443.32 and is therefore in the molecular weight range of the compounds in the training set.
- Structural and mechanistic domains:
The number of each fragment found in the substance does not exceed the maximum number of this fragment that occurs in any individual compound of the training set.
6. ADEQUACY OF THE RESULT
The substance fits in the applicability domain of the model. The prediction is valid and can be used for classification and risk assessment.

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2019

Report date:

2019

Materials and methods

Principles of method if other than guideline:

Calculation based on BIOWIN v4.10, Estimation Programs Interface Suite™ for Microsoft® Windows v 4.10. US EPA, United States Environmental Protection Agency, Washington, DC, USA.

GLP compliance:

no

Test material

Test material information

Constituent 1

Reference substance name:

(4-carboxybutyl)triphenylphosphonium bromide

EC Number:

241-782-5

EC Name:

(4-carboxybutyl)triphenylphosphonium bromide

Cas Number:

17814-85-6

Molecular formula:

C23H24BrO2P

IUPAC Name:

(4-carboxybutyl)triphenylphosphonium bromide

Study design

Oxygen conditions:

aerobic

Inoculum or test system:

activated sludge (adaptation not specified)

Results and discussion

% Degradation

Parameter:

probability of ready biodegradability (QSAR/QSPR)

Remarks on result:

not readily biodegradable based on QSAR/QSPR prediction

Details on results:

For detailed description on the model and its applicability, see "Any other information on materials and methods incl. tables".

Any other information on results incl. tables

Table 1. Ready biodegradability prediction using BIOWIN v4.1

Biowin1 (Linear Model Prediction)	0.9935	biodegrade fast
Biowin2 (Non-Linear Model Prediction):	0.9401	biodegrade fast
Biowin3 (Ultimate Biodegradation Timeframe):	2.6501	weeks-months
Biowin4 (Primary Biodegradation Timeframe):	3.6084	days-weeks
Biowin5 (MITI Linear Model Prediction) :	-0.1047	not readily degradable
Biowin6 (MITI Non-Linear Model Prediction):	0.0036	not readily degradable
Biowin7 (Anaerobic Model Prediction):	0.3499	does not biodegrade fast
Ready Biodegradability Prediction:		no

The substance fits in the applicability domain of the model as:

- the molecular weight of the test substance (443.32 g/mol) is within the molecular weight range of the training set compounds

The prediction is further supported by the results for similar structures.

The similar substance ethyltriphenylphosphonium bromid (CAS 1530 -32 -1) is predicted to be not readily biodegradable by BIOWIN. For ethyltriphenylphosphonium bromid experimental data is available at the respective dissiminated REACH dossier confirming that the substance is not readily biodegradable. Also the similar substance (methoxymethyl)triphenylphosphonium chloride is predicted to be not readily biodegradable by BIOWIN.

The similar substance (methoxymethyl)triphenylphosphonium chloride (CAS 4009 -98 -7) is predicted to be not readily biodegradable by BIOWIN. Also for (methoxymethyl)triphenylphosphonium chloride experimental data is available at the respective dissiminated REACH dossier confirming that the substance is not readily biodegradable.

This supports the use of the model for the structural class alkyltriphenylphosphoium salts and therefore, the prediction for (4-carboxybutyl)triphenylphosphonium bromide is considered to be valid and can be used for classification and risk assessment.

Applicant's summary and conclusion

Validity criteria fulfilled:

not applicable

Interpretation of results:

not readily biodegradable

Conclusions:

The outcome of the BIOWIN program results in the conclusion that the substance is not readily degradable. This is supported by results for similar substances.