Potassium dodecyl sulphate

Biodegradation in water: screening tests

Link to relevant study record(s)

Reference

Endpoint:

biodegradation in water: screening tests

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 limited documentation / justification

Justification for type of information:

The supporting QMRF report has been attached

Qualifier:

according to guideline

Guideline:

OECD Guideline 301 C (Ready Biodegradability: Modified MITI Test (I))

Principles of method if other than guideline:

The data is predicted using the OECD QSAR toolbox version 3.3 with logKow as the primary descriptor.

GLP compliance:

not specified

Specific details on test material used for the study:

- Name of test material : Potassium dodecyl sulfate
- Molecular formula : C12H25KO4S
- Molecular weight : 304.49 g/mol
- Smiles notation : S(OCCCCCCCCCCCC)(=O)([O-])=O.[K+]
- InChl : 1S/C12H26O4S.K/c1-2-3-4-5-6-7-8-9-10-11-12-16-17(13,14)15;/h2-12H2,1H3,(H,13,14,15);/q;+1/p-1
- Substance type: Organic
- Physical state: Solid

Oxygen conditions:

aerobic

Inoculum or test system:

other: Microorganisms

Duration of test (contact time):

28 d

Based on:

not specified

Parameter followed for biodegradation estimation:

other: BOD

Key result

Parameter:

other: BOD

Value:

73.82

Sampling time:

28 d

Remarks on result:

other: Other details not known

Details on results:

Test substance undergoes 73.81% degradation by BOD in 28 days.

The prediction was based on dataset comprised from the following descriptors: BOD
Estimation method: Takes average value from the 5 nearest neighbours
Domain  logical expression:Result: In Domain

(((("a" or "b" or "c" or "d" or "e" or "f" )  and "g" )  and "h" )  and ("i" and "j" )  )

Domain logical expression index: "a"

Referential boundary: The target chemical should be classified as Alkyl sulfates by OECD HPV Chemical Categories

Domain logical expression index: "b"

Referential boundary: The target chemical should be classified as Anionic Surfactants by US-EPA New Chemical Categories

Domain logical expression index: "c"

Referential boundary: The target chemical should be classified as Alkoxy OR Sulfate by Organic Functional groups ONLY

Domain logical expression index: "d"

Referential boundary: The target chemical should be classified as Alkoxy OR Overlapping groups OR Sulfate by Organic Functional groups (nested) ONLY

Domain logical expression index: "e"

Referential boundary: The target chemical should be classified as Aliphatic Carbon [CH] OR Aliphatic Carbon [-CH2-] OR Aliphatic Carbon [-CH3] OR Miscellaneous sulfide (=S) or oxide (=O) OR Suflur {v+4} or {v+6} OR Sulfate, linear [-O-SO2-O-] OR Sulfite, linear [-OS(=O)O-] by Organic functional groups (US EPA) ONLY

Domain logical expression index: "f"

Referential boundary: The target chemical should be classified as Anion OR Cation OR Sulfuric acid derivative by Organic functional groups, Norbert Haider (checkmol) ONLY

Domain logical expression index: "g"

Referential boundary: The target chemical should be classified as Biodegrades Fast by Biodeg probability (Biowin 7) ONLY

Domain logical expression index: "h"

Referential boundary: The target chemical should be classified as Does NOT Biodegrade Fast by Biodeg probability (Biowin 6) ONLY

Domain logical expression index: "i"

Parametric boundary:The target chemical should have a value of Molecular weight which is >= 154 Da

Domain logical expression index: "j"

Parametric boundary:The target chemical should have a value of Molecular weight which is <= 345 Da

Validity criteria fulfilled:

not specified

Interpretation of results:

readily biodegradable

Conclusions:

The test chemical Potassium dodecyl sulfate was estimated to be readily biodegradable in water.

Executive summary:

Biodegradability of Potassium dodecyl sulfate (CAS no. 4706 -78 -9) is predicted using OECD QSAR toolbox version 3.3 with logKow as the primary descriptor. Test substance undergoes 73.81% degradation by BOD in 28 days.Thus, based on percentage degradation, the test chemical Potassium dodecyl sulfate was estimated to be readily biodegradable in water.

Description of key information

Biodegradability of Potassium dodecyl sulfate (CAS no. 4706 -78 -9) is predicted using OECD QSAR toolbox version 3.3 (2017) with logKow as the primary descriptor. Test substance undergoes 73.81% degradation by BOD in 28 days.Thus, based on percentage degradation, the test chemical Potassium dodecyl sulfate was estimated to be readily biodegradable in water.

Key value for chemical safety assessment

Biodegradation in water:

readily biodegradable

Additional information

Predicted data for the target compound Potassium dodecyl sulfate(CAS No. 4706-78-9) and various supporting weight of evidence studies for its read across substance were reviewed for the biodegradation end point which are summarized as below:

 

In a prediction done by SSS (2017) using OECD QSAR toolbox version 3.3 with logKow as the primary descriptor, percentage biodegradability of test chemicalPotassium dodecyl sulfate(CAS No. 4706-78-9) was estimated.Test substance undergoes 73.81% degradation by BOD in 28 days. Thus, based on percentage degradation, the test chemical Potassium dodecyl sulfate was estimated to be readily biodegradable in water.

 

In a supporting weight of evidence study from authoritative database (J-CHECK, HSDB, 2017 and Envichem, 2014) for the read across chemical Sodium dodecyl sulfate (CAS no. 151-21-3),biodegradation experiment was conducted for 14 days for evaluating the percentage biodegradability of read across substance Sodium dodecyl sulfate under aerobic conditions. The study was performed according to OECD Guideline 301 C (Ready Biodegradability: Modified MITI Test (I)). Concentration of inoculum i.e, sludge used was 30 mg/l and initial test substance conc. used in the study was 100 mg/l, respectively. The percentage degradation of substance Sodium dodecyl sulfate was determined to be 85 and 99.3% by BOD, O2 consumption, TOC removal, Test mat. analysis and UV-VIs parameter in 14 days. Thus, based on percentage degradation, Sodium dodecyl sulfate is considered to be readily biodegradable in nature.

 

For the same read across chemical Sodium dodecyl sulfate (CAS no. 151-21-3),biodegradation experiment was conducted for 28 days for evaluating the percentage biodegradability of read across substance Sodium dodecyl sulfate (GSBL database, 2017). The study was performed according to OECD Guideline 301 A (Ready Biodegradability: DOC Die Away Test). Mixed culture was used as a test inoculum obtained from sewage treatment plant, drain. Initial test substance conc. used in the study was 40 mg DOC/l. The percentage degradation of substance Sodium dodecyl sulfate was determined to be >90% by DOC removal parameter in 28 days. Thus, based on percentage degradation, Sodium dodecyl sulfate is considered to be readily biodegradable in nature.

 

Another biodegradation study from authoritative database (HSDB, 2017) was conducted for 14 days for evaluating the percentage biodegradability of read across substance (dodecyloxy)sulfonic acid (CAS no. 151 -41 -7). The study was performed according to OECD Guideline 301 C (Ready Biodegradability: Modified MITI Test (I)) under aerobic conditions. Concentration of inoculum i.e, sludge used was 30 mg/l and initial test substance conc. used in the study was 50 mg/l, respectively. The percentage degradation of substance (dodecyloxy)sulfonic acid was determined to be 70 and 93% by BOD and DOC removal parameter in 14 days. Thus, based on percentage degradation, (dodecyloxy)sulfonic acid is considered to be readily biodegradable in nature.

 

In a supporting weight of evidence study from secondary source (OECD SIDS, 2007) for the read across chemical Sodium decyl sulfate (CAS no. 142-87-0), biodegradation experiment was conducted for 30 days for evaluating the percentage biodegradability of read across substance Sodium decyl sulfate (CAS no. 142-87-0). The study was performed according to OECD Guideline 301 D (Ready Biodegradability: Closed Bottle Test). Test substance undergoes 98% degradation by O2 consumption parameter in 30 days. The pass level for ready biodegradability was reached within 14 days. Thus, based on percentage degradation, Sodium decyl sulfate is considered to be readily biodegradable in nature.

 

On the basis of above results for target chemicalPotassium dodecyl sulfate(from OECD QSAR toolbox version 3.3, 2017) and for its read across substance (from authoritative database J-CHECK, HSDB, Envichem, GSBL database and secondary source), it can be concluded that the test substancePotassium dodecyl sulfatecan be expected to be readily biodegradable in nature.