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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Additional information

1,2 -dichlorobenzene is very toxic to daphnids and toxic to fish and algae.

Publications for all trophic levels are available. For fish, several acute tests have been published. The most sensitive species was the Rainbow trout (Oncorynchus mykiss) for which a LC50 of 1.52 mg/L has been calculated. For the chronic exposure, no reliable NOEC is available. According to the Regulation EC No 1907/2006 (REACH) Annex IX 9.1.6 column 2, the study is not needed due to exposure considerations as the predicted environmental concentration in surface water is below the PNEC based on the endpoints of the available aquatic studies (see chapter 9 and 10 of the chemical safety report for 1,2-dichlorobenzene). Aquatic invertebrates were found to be the most sensitive organisms when they are exposed to 1,2 -dichlorobenzene which is demonstrated by an EC50 (48 h) of 0.66 mg/L obtained for Ceriodaphnia dubia. In publications of long-term tests with Daphnia magna, the lowest endpoint was an EC16 of 0.37 mg/L. This value is viewed by the authors of the publication as being the NOEC in view of the fact that a 10 -20% reduction in reproduction lies within the range of natural variability. For algae, an ErC50 (96 h) of 2.2 mg/L was published. The exact NOEC could not be determined (< 0.88 mg/L).

For aquatic microorganisms, an IC50 (24 h) of 47 mg/L was obtained in a nitrification inhibition test with Nitrosomonas conducted according to ISO Guideline 9509. Thus, 1,2 -dichlorobenzene is considered to have harmful effects on microorganisms in sewage treatment plants.