Benzenesulfonic acid, 4-C10-13-sec-alkyl derivs., compds. with 2-propanamine

Long-term toxicity to fish

Administrative data

Endpoint:

fish life cycle toxicity

Type of information:

experimental study

Adequacy of study:

weight of evidence

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 1

Reference Type:

publication

Title:

Unnamed

Year:

1970

Reference 2

Reference Type:

publication

Title:

Predicted no-effect concentrations and risk characterization of four surfactants: Linear alkylbenzene sulfonate, alcohol ethoxylates, alcohol ethoxylated sulfates, and soap.

Author:

van de Plassche, E.J., de Bruijn, J.H.M., Stephenson, R.R., Marshall, S.J., Feijtel, T.C.J. and Belanger, S.E.

Year:

1999

Bibliographic source:

Environmental Toxicology and Chemistry. 18:2653-2663.

Materials and methods

Principles of method if other than guideline:

During the first four months a serial-dilution unit was used to maintain the LAS at the desired concentration in System I and a proportional dilution unit was used in System II, both to provide continuous exposures to fathead minnows. During the latter part of the test, the flows from a new proportional dilution unit were divided to supply both exposure systems and a fry exposure system.

GLP compliance:

not specified

Test material

Test material information

Constituent 1

Reference substance name:

Benzenesulfonic acid, C10-13-alkyl derivs., sodium salts

EC Number:

270-115-0

EC Name:

Benzenesulfonic acid, C10-13-alkyl derivs., sodium salts

Cas Number:

68411-30-3

Molecular formula:

Not applicable for UVCB

IUPAC Name:

sodium 4-undecylbenzenesulfonate

Details on test material:

LAS, activity: 60.8%; equivalent MW = 348

Sampling and analysis

Analytical monitoring:

yes

Test solutions

Vehicle:

not specified

Test organisms

Test organisms (species):

Pimephales promelas

Details on test organisms:

Fish were obtained from the ponds at the Newtown Fish Farm, Ohio Division of Wildlife. The small young-of-the-year fish were collected in late September and held in cold water. During the last week of December, 25 fish were placed randomly into each exposure chamber where they were maintained in a continuous flow of dilution water similar to that used during the test. The four largest and eight smallest fish from each aquarium were selected in order to reduce the number of fish and to try to get a more equal distribution of sexes. The exposure to LAS was started during the last week of February.

Study design

Test type:

other: other, open-system

Water media type:

freshwater

Limit test:

no

Total exposure duration:

196 d

Test conditions

Hardness:

water hardness ranged from 194-214 mg/L CaCO3

pH:

pH ranged from 7.50-7.95

Dissolved oxygen:

Mean dissolved oxygen 5.84-6.42 mg/L

Nominal and measured concentrations:

Test concentrations were 0.34, 0.63, 1.2 and 2.7 mg/L.

Reference substance (positive control):

not specified

Results and discussion

Effect concentrations

Effect concentrations 1

Key result

Duration:

196 d

Dose descriptor:

NOEC

Effect conc.:

0.63 mg/L

Nominal / measured:

meas. (geom. mean)

Basis for effect:

other: fry survival

Effect concentrations 2

Duration:

196 d

Dose descriptor:

LOEC

Effect conc.:

1.2 mg/L

Nominal / measured:

meas. (geom. mean)

Basis for effect:

other: fry survival

Details on results:

Hatchability and growth were not significantly affected. This study was on C12-LAS and when normalized to C11.6, the value is 0.90 mg/L (van de Plassche et al., 1999).

Applicant's summary and conclusion

Validity criteria fulfilled:

yes

Conclusions:

The 196 day NOEC level was 0.63 mg/L. The LOEC was 1.2 mg/L.

Executive summary:

Fathead minnows were exposed to LAS in continuous flow systems for a total of 196 days. Results indicate that lethality of LAS to newly hatched fry was the most critical factor found.