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Ecotoxicological information

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The terrestrial toxicity data of Reaction product of naphthalene, butanol, sulfonated and neutralized by caustic soda have been determined by a read-across approach based on analogue substance Reaction product of naphthalene, propan-2-ol, sulfonated and neutralized by caustic soda.

The terrestrial toxicity data of Reaction product of naphthalene, butanol, sulfonated and neutralized by caustic soda are summarized below:

Toxicity to soil macroorganisms:

Sodium diisopropylnaphthalenesulphonate did not reduce the reproduction of Eisenia fetida at a nominal concentration of 6.0 mg a.i./kg d.s. after 56 days of exposure (NOEC). The 56-day EC50 for reproduction exceeded the highest concentration tested, i.e. was above 162 mg a.i./kg d.s.

Based on the results of this study, by analogy (Read across approach) Reaction product of naphthalene, butanol, sulfonated and neutralized by caustic soda has no effect on soil macroorganisms.

 

Toxicity to soil microorganisms:

Supragil WP (sodium diisopropylnaphthalenesulphonate) tested at 1.00, 10.0, 100, 500 and 1000 mg/kg dry soil, showed a statistically significant effect on soil nitrogen mineralisation compared to the control treatment at 100, 500 and 1000 mg product/kg dry soil on the rate of transformation at the end of the 28 day test period (Dunnett’s two tail, p=0.05). The concentration of nitrate in the soil at the end of the test period was statistically different from the control treatment in all treatements except the lowest at 1.00 mg product/kg. For the Day 0 to 28 period, the EC10 , EC25 and EC50 for the rate of nitrate production (net mineralisation) were estimated at 164, 260 and 420 mg Supragil WP/kg dry soil, respectively. As there is a difference in the rate of nitrate production between the control replicates and the higher treatment rates was greater than 25% from Day 0 to Day 28, Supragil WP can be assessed as having a long-term influence on the nitrogen transformation in soils at concentrations ≥100 mg product/kg dry soil.

 

Based on the results of this study, by analogy (Read across approach) Reaction product of naphthalene, butanol, sulfonated and neutralized by caustic soda has no effect on soil microorganisms.