LINEAR ALKYLBENZENE SULFONATE (LAS) - UNEP Chemicals

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OECD SIDS LINEAR ALKYLBENZENE SULFONATE (LAS) gallon glass aquaria for each of five concentrations plus controls. Ten snails were placed in each of two replicate chambers per concentration. The frequency of snails crawling on the test chamber walls was recorded throughout the tests. Mean measured LAS concentrations were 0.2, 0.4, 1.0, 1.9, and 4.4 mg/L. GLP: Yes [ ] No [X] ? [ ] Test substance: Commercial LAS formulation containing 14% LAS, 2.3% alcohol ethoxylate oxide condensate, 2.5% sodium soap, 48% sodium tripolyphosphate, 9.7% sodium silicate, 15.4% sodium sulphate, and 8.1% moisture and miscellaneous. Remarks: Survival of C. decisum was affected only in the highest test concentration (4.4 mg/L). Mobility and feeding responses were altered in LAS concentrations of 1.9 and 1.0 mg/L, respectively. Reference: Arthur, J.W. 1970. Chronic effects on linear alkylbenzene sulfonate detergent on Gammarus pseudolimnaeus, Campeloma decisum and Physa integra. Water Res. 4:251-257. Reliability: 4 Not assignable. Test substance is a formulation containing a mixture of materials, of which only 14% is LAS. The contribution of each component cannot be separately assigned. (k) Type of test: static [ ]; semi-static [ ]; flow-through [X]; open-system [X]; closed-system [ ] Species: Physa integra (freshwater mollusc; pulmonate snail) Endpoint: Mortality [X]; Reproduction rate [ ]; Other [X] mobility and feeding response Exposure period: 6 weeks Results: NOEC = 4.4 mg/L LOEC = >4.4 mg/L Analytical monitoring: Yes [ ] No [X] ? [ ] Method: Two 6-week chronic studies were performed in which an amphipod, a pulmonate snail, and an operculate snail were tested together. A serial diluter was used to provide continuous flow conditions into duplicate 4gallon glass aquaria for each of five concentrations plus controls. The frequency of snails crawling on the test chamber walls was recorded throughout the tests. Mean measured LAS concentrations were 0.2, 0.4, 1.0, 1.9, and 4.4 mg/L. GLP: Yes [ ] No [ ] ? [X] Test substance: Commercial LAS formulation containing 14% LAS, 2.3% alcohol ethoxylate oxide condensate, 2.5% sodium soap, 48% sodium tripolyphosphate, 9.7% sodium silicate, 15.4% sodium sulphate, and 8.1% moisture and miscellaneous. Remarks: No significant effects on survival, mobility, or feeding responses was observed in P. integra at any LAS concentration tested. Reference: Arthur, J.W. 1970. Chronic effects on linear alkylbenzene sulfonate detergent on Gammarus pseudolimnaeus, Campeloma decisum and Physa integra. Water Res. 4:251-257. Reliability: 4 Not assignable. Test substance is a formulation containing a mixture of materials, of which only 14% is LAS. The contribution of each component cannot be separately assigned. (l) Type of test: static [ ]; semi-static [ ]; flow-through [X]; open-system [X]; closed-system [ ] Species: Gammarus pseudolimnaeus (freshwater amphipod) UNEP PUBLICATIONS 214
OECD SIDS LINEAR ALKYLBENZENE SULFONATE (LAS) Endpoint: Mortality [X]; Reproduction rate [ ]; Other [X] mobility and feeding responses Exposure period: 6 weeks Results: For adult survival: NOEC = 0.2 mg/L, LOEC = 0.4 mg/L For reproduction: NOEC < 0.2 mg/L, LOEC = 0.2 mg/L Analytical monitoring: Yes [X] No [ ] ? [ ] Method: Two 6-week chronic studies were performed in which an amphipod, a pulmonate snail, and an operculate snail were tested together. A serial diluter was used to provide continuous flow conditions into duplicate 4gallon glass aquaria for each of five concentrations plus controls. Ten snails were placed in each of two replicate chambers per concentration. Complete immobilization was taken as a sign of death for the amphipods. Mean measured LAS concentrations were 0.2, 0.4, 1.0, 1.9, and 4.4 mg/L. Only adult amphipods were started in each 6-week test. Following the termination of the second 6-week test, however, the newly hatched Gammarus were counted and allowed to remain in each respective test chamber for 15 weeks of additional exposure. GLP: Yes [ ] No [X] ? [ ] Test substance: Commercial LAS formulation containing 14% LAS, 2.3% alcohol ethoxylate oxide condensate, 2.5% sodium soap, 48% sodium tripolyphosphate, 9.7% sodium silicate, 15.4% sodium sulphate, and 8.1% moisture and miscellaneous. Remarks: Adult survival was affected at all concentrations after 6-weeks in a somewhat dose-responsive manner, as shown in the following table. Based on adult survival, the NOEC is 0.2 mg/L and the LOEC is 0.4 mg/L. Mean LAS Concentration (mg/L) 4.4 1.9 1.0 0.4 0.2 Control Duplicate Chambers A B A B A B A B A B A B Trial 1 Trial 2 0 0 10 10 40 30 30 40 70 40 80 70 0 0 0 0 20 30 20 40 50 50 60 40 Newly hatched amphipods were not produced in the highest concentration (4.4 mg/L). The results on survival of F1 Gammarus from the second 6-week study, and the final numbers of gravid F1 females and F2 young produced after 15 weeks of exposure are shown below. Control F1 females were the first to release F2 young, and this occurred after 9 weeks. Females began liberation of F2 young at 13 and 13.5 weeks for the 0.2 and 0.4 mg/L chambers, respectively. Based on variability and apparent reproductive effects at the lowest concetration, no NOEC value could be determined. The LOEC is 0.2 mg/L. UNEP PUBLICATIONS 215
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LINEAR ALKYLBENZENE SULFONATE (LAS) - UNEP Chemicals

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