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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Toxicity to aquatic algae and cyanobacteria

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Administrative data

Link to relevant study record(s)

Description of key information

This study was designed to determine the effects of the test item on the growth of Pseudokirchneriella subcapitata in a 72-hour test according to the OECD 201 Guideline. The tests solutions were prepared from dilutions of a stock solution. Tested concentrations were 9.5 ; 17.1 ; 30.9 ; 55.6 ; 100 mg/l nominal. pH was adjusted where relevant to fall within pH 7-8 range. Test concentrations were analytically monitored.

The results are reported as growth rate. The concentrations that result in a 10 and 50% reduction in growth rate (72h-ErC10 and 72h-ErC50, respectively) were determined.

Chemical analysis of test samples taken indicated that measured concentrations of the test item remained within 80-120% of the nominal concentrations and were maintained over the 72h test period (i.e. deviation <20%). Based on these results, the exposure concentrations were based on nominal concentrations:

72h-ErC10 = 16.8 mg/L

72h-ErC50 = 35.0 mg/L

Key value for chemical safety assessment

EC50 for freshwater algae:
35 mg/L
EC10 or NOEC for freshwater algae:
16.8 mg/L

Additional information