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Ecotoxicological information

Short-term toxicity to fish

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Description of key information

LC50 (48 h) 700 mg/L Leuciscus idus melanotus (r-a)

Key value for chemical safety assessment

LC50 for freshwater fish:
700 mg/L

Additional information

No reliable toxicity to freshwater fish data are available for tripotassium citrate, CAS 866-84-2. A fish short term toxicity study is, however, available for the parent acid of tripotassium citrate, citric acid (CAS 77-92-9). It is considered appropriate to read across the short term toxicity to fish results for tripotassium citrate, 866-84-2, because under conditions relevant to ecotoxicity assessment, the potassium salt and citric acid are expected to be fully dissociated. Potassium is not expected contribute to the toxicity of the substance being a ubiquitous element.

The test reported (48 h) LC50 values corresponding to 440 mg/L and 760 mg/L determined in two laboratories conducting tests in parallel for the effects of citric acid, CAS 77-92-9 on mortality of the freshwater fish Leuciscus idus melanotus.

Calculations of the LC50 for tripotassium citrate:

The lowest (48 h) LC50 for citric acid is 440 mg/L, which is equivalent to 440 * 1.59 = 700 mg/L of tripotassium citrate 866-84-2

(using MW(tripotassium citrate)/MW(citric acid) = 306.4/ 192.9 = 1.59)