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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Ecotoxicological information

Endpoint summary

Administrative data

Description of key information

For the assessment of 1H-Benzotriazole a complete dataset for the aquatic environment is available. In total, 10 short-term studies with fish, invertebrates and algae as well as 5 studies on long-term effects on all three trophic levels are reported. in addition, the toxicity to microorganisms was investigated in three studies.
The calculation of the PNECs is based on the long-term effect value of an OECD 211 study exposing D. galeata and an OECD 209 study exposing activated sludge. Potential endocrine disrupting effects were examined in a sexual development study with fish. In the study no endocrine effect was observed up to the maximal test concentration of 11.0 mg/L.

Additional information

The effect concentrations in the short-term fish studies (OECD 203 and 236) are in the range of 170-180 mg/L with one FET study showing significantly less effect concentrations. This study could not be fully evaluated due to missing information. The initial phase of the OECD 234 long-term fish study convers the endpoints of a standard OECD 210 long-term fish test. From the observations a NOEC of 1.07 mg/L based on the post-hatch survival was calculated.
In the short term tests with aquatic invertebrates effect concentrations in the range of 91-137 mg/L were observed for tests exposing D. magna. In one study D. galeata was exposed to BTA showing an effect concentration of 15.8 mg/L. As this species is significantly smaller than D. magna this difference is considered as reason for the lower effect concentration. A similar situation can be seen in the long-term studies with invertebrates. The calculated effect concentration for D. magna is about 25 mg/L (second study showed no effects due to lower selected concentration range), and the effect concnetration in D. galeata is calculated at 0.97 mg/L.
In studies with algae the short-term values range from 97-231 mg/L and the long-term values were observed in the range of 1.18 to 58 mg/L. In addition, a study with higher aquatic plants (L. minor) is available showing an EC10 (7d) of 3.94 mg/L.
Based on the available effect concentrations all trophic levels are considered to be similar sensitive to 1H-Benzotriazole, respectively no specific mode of action was identified. The short-term effects are above 10 mg/L (D. galeata), respectively in the range of 100 mg/L or above (fish, D. magna, algae). The long term effects value are in the range of 1 mg/L. In conclusion, 1H-Benzotriazole is considered moderately toxic for aquatic organisms. The same conclusion can be made for microorganisms in STPs considering the results from the available tests.