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Description of key information

NOECreproduction = 250 mg/kg dw

Additional information

No short-term terrestrial test data is available for Naphthalenesulfonic acid, methyl, butyl, sodium salt (CAS no.: 68909-83-1). The result of the long-term terrestrial test as performed with Naphthalenesulfonic acid, bis(1-methylethyl)-, methyl dervis., sodium salt (CAS no.: 68909 -82 -0) is read across to the structural analogue Naphthalenesulfonic acid, methyl, butyl, sodium salt

The effects of Naphthalenesulfonic acid, bis(1-methylethyl)-, methyl dervis., sodium salt on mortality, biomass and reproduction of Eisenia fetida was tested according to OECD 222..

The study was conducted under static conditions over 8 weeks with the test item concentrations 15.625 – 31.25 – 62.5 – 125 – 250 – 500 mg Naphthalenesulfonic acid, bis(1-methylethyl)-, methyl dervis., sodium salt /kg SDW. Each application rate was mixed into artificial soil containing 5 % peat. In addition tests using control were performed.

The test is valid without restrictions and the results are reliable.

After 28 days of exposure in soil, neither evident earthworm mortalities (< 10%) nor pathological symptoms or changes in the behaviour of adult earthworms were observed in the control or all test item concentrations. There were no statistically significant differences in earthworm body weight gains in the test item concentrations 15.625 to 250 mg Naphthalenesulfonic acid, bis(1-methylethyl)-, methyl dervis., sodium salt/kg soil dry weight compared to the control. At the test concentration of 500 mg Naphthalenesulfonic acid, bis(1-methylethyl)-, methyl dervis., sodium salt/kg the earthworm body weight gain was statistically significantly reduced. After a further four weeks, the reproduction rate (average number of juveniles produced) was 127 in the control and ranged from 28 to 139 in the test item treatment rates. There were no statistically significant differences in earthworm reproduction in the treatment rates 15.625 to 250 mg Naphthalenesulfonic acid, bis(1-methylethyl)-, methyl dervis., sodium salt /kg SDW compared to the control. At the test concentration of 500 mg Naphthalenesulfonic acid, bis(1-methylethyl)-, methyl dervis., sodium salt /kg the earthworm reproduction was statistically significantly reduced. Overall, the NOEC of the test item concerning mortality, biomass and reproduction was determined to be 250 mg Naphthalenesulfonic acid, bis(1-methylethyl)-, methyl dervis., sodium salt /kg SDW. The EC50-value for reproduction was determined to be 398 mg Naphthalenesulfonic acid, bis(1-methylethyl)-, methyl dervis., sodium salt/kg SDW.