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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

Psuedokirchenerialla quadricauda, 72hr, EC50 (biomass) 12,000mg/l, NOEC(biomass)=4100mg/l (protocol ISO8692)
Scenedesmus quadricauda. 8 day EC3 >10,000mg/l (protocol: no data)
Green algae. 96hr EC50 =1043mg/l NOEC=245 (protocol: QSAR)

Key value for chemical safety assessment

EC50 for freshwater algae:
12 000 mg/L
EC10 or NOEC for freshwater algae:
4 100 mg/L

Additional information

There is limited data available on the toxicity of methoxyethanol to algae. One of the two experimental studies available has significant limitations which suggests it could underestimate toxicity. The second study is to a more modern protocola and is reliable, although the available publication is not particularly detailed. QSAR modelling also predicts that methoxyethanol is of low toxicity to algae, which supports the experimental data available, even if the QSAR suggests higher toxicity than the experimental data. These results together, along with the other aquatic toxicity data, are sufficient to judge with confidence that methoxyethanol is of very low toxicity to algae. In this case, the most recent experimental study is used to derive the acute EC50.