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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

The influence of the test item Paradimethoxybenzene on the growth of the freshwater green algal species Pseudokirchneriella subcapitatawas investigated in a 72H static test according to OECD Guideline 201 and GLP. The EC50 for yield and growth rate were determined to be 24.9 and 50.5 mg/L, respectively (based on the mean measured test item concentrations, calculated as the geometric mean over all measurements per test concentration during the test period). The 72-hour NOEC and LOEC for yield were determined to be 1.95 and 6.8, respectively. The 72-hour NOEC and LOEC for growth rate were determined to be 6.8 and 21.6 mg/L, respectively.

Key value for chemical safety assessment

EC50 for freshwater algae:
50.5 mg/L
EC10 or NOEC for freshwater algae:
6.8 mg/L

Additional information

Three studies were available, but only one (RCC, 2006) was of reliability 1 according to Klimisch and was selected as key study.

The two other studies were of reliability 3, they were poorly described, so were not taken into account for the assessment.

In the key study, (RCC, 2006),