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Ecotoxicological information

Short-term toxicity to aquatic invertebrates

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Description of key information

Lithium hydroxide (55.2 %) was tested for short term aquatic toxicity in Daphnia in an 48-hour static test according to EU Method C.2 and OECD Guideline 202. Without pH-adjustment the 48 hour EC 50-value was 19.1 mg/L. With  pH-adjustment the 48-hour EC 50-value 34.3 mg/L for lithium hydroxide anhydrous. Based on these data, the calculated EC50 without pH-adjustment for lithium hydroxide monohydrate was 33.5 mg/L and with pH-adjustment 60.1 mg/L. 

Key value for chemical safety assessment

Fresh water invertebrates

Fresh water invertebrates
Effect concentration:
34.3 mg/L

Additional information

The acute toxicity of the test substance lithium hydroxide (55.2 %, i.e. test material was lithium hydroxide monohydrate but for the results the purity was considered, thus they refer to lithium hydroxide anhydrous) to Daphnia magna was determined in a 48-hour static test according to the EU method Annex Part C.2 and the OECD Guideline No. 202. The nominal concentrations tested were 4.6, 10, 21, 46 and 100 mg test substance/L, and in parallel a control. At one series of test media the pH was adjusted to approximately pH 8 by HCl, at the other series not. This allowed to differentiate if a toxic effect is caused due to a pH-effect of the test substance with a strong basic pH, or if it is a real toxic effect of lithium(-hydroxide). The analytical determined test substance concentrations in the analysed test media varied in the range from 93.5 % to 103.2 % of the nominal values. In the test media the test substance concentrations were constant during the test period of 48 hours. Therefore, all reported biological results are related to the nominal concentrations of the test substance.

Without pH-adjustment the 48 hour EC50-value was 19.1 mg/L and with pH-adjustment the 48-hour EC50-value 34.3 mg/L for lithium hydroxide anhydrous. Based on these data, the calculated EC50 without pH-adjustment for lithium hydroxide monohydrate was 33.5 mg/L and with pH-adjustment 60.1 mg/L. Consequently the LC50 values of 34.3 mg/L and 60.1 mg/L represent the relevant figures for lithium hydroxide anhydrous and lithium hydroxide monohydrate, respectively. It is obvious that lithium hydroxide monohydrate was the test material (due to the indicated purity: 55.2%) but the study results and study title refer to lithium hydroxide anhydrous.