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For barium 4-dodecylphenolate, aquatic toxicity studies are not vailable. Read-across to the assessment entities soluble barium substances and dodecylphenolate is applied for the assessment of barium 4-dodecylphenolate since the ions of barium 4-dodecylphenolate determine its fate and toxicity in the environment. Reliable data available for soluble barium substances and dodecylphenolate indicate that the moiety of ecotoloxicological concern are dodecylphenolate anions.

Acute (short-term) toxicity data: EC/LC50 values of 3 trophic levels (algae, invertebrates and fish) range for barium from > 1.15 mg Ba/L to 14.5 mg Ba/L. According to QSAR-based predictions, dodecylphenolate has a potential for acute toxicity to fish and aquatic invertebrates since EC/LC50 values available for 2 trophic levels range from 0.038 mg/L to 0.112 mg/L.

Chronic (long-term) toxicity: NOEC/EC10 values of 3 trophic levels (algae, invertebrates and fish) range from ≥ 1.15 mg Ba/L to 2.9 mg Ba/L. According to QSAR-based predictions, dodecylphenolate has a potential for chronic toxicity to fish, aquatic invertebrates and algae since the chronic ChV values range from 0.0057 mg/L to 0.026 mg/L.

The potential of barium cations for toxicity to aquatic microorganisms is low since the 3-h NOEC for respiration inhibition is >= 1000 mg/L BaCl2. Adverse effects of dodecylphenolate on bacterial respiration were also not observed at and above the water solubility limit. .

In sum, barium 4 -dodecylphenolate is expected to be toxic to aquatic organisms except for microorganisms.

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