Caesium chloride

Endpoint summary

Additional information

Short-term toxicity to fish:

A short-term toxicity study to fish with cesium chloride is not available. Consequently, read-across was applied using data from cesium hydroxide monohydrate. Under the conditions of this acute fish toxicity study the observed endpoints for the effect of cesium hydroxide monohydrate were the followings: 96h NOEC value: ≥ 100 mg test item/L; 96h LOEC value: > 100 mg test item/L and 96h LC50 value: > 100 mg test item/L. Based on these data the calculated values of 96h-LC50, 96h-LOEC and 96h-NOEC for cesium are greater than 79 mg/L and for cesium chloride are greater than 100 mg/L.

Long-term toxicity to fish:

A long-term toxicity study to fish with cesium chloride is not available. Consequently, read-across was applied using data from cesium hydroxide monohydrate. Under the conditions of this early life stage toxicity study, the test item had no significant lethal or sub-lethal effects on early life stages of Zebrafish (Danio rerio). The calculated endpoints (35 days LOEC and NOEC) were the following in this test: The 35 d LOEC> 43 mg test item/L The 35 d NOEC = 43 mg test item/L Based on these data, the calculated NOEC for cesium was 34 mg/L and the LOEC was greater than 34 mg/L and for cesium chloride the calculated NOEC was 43 mg/L and the LOEC was greater than 43 mg/L.

Short-term toxicity to aquatic invertebrates:

In this 48-hour semi-static acute toxicity test with Daphnia magna the 48 h EC50 value of cesium chloride was determined as 37.4 mg/L, and the 48 h NOEC was determined to be 23.4 mg/L. The results are based on the nominal test item concentrations.

Long-term toxicity to aquatic invertebrates:

A long-term toxicity study to aquatic invertebrates with cesium chloride is not available. Consequently, read-across was applied using data from cesium hydroxide monohydrate. Under the conditions of this chronic daphnia toxicity study the observed endpoints related to reproduction for the effect of cesium hydroxide monohydrate were the following: 21d NOEC: 15.8 mg/L; 21d LOEC: 30.0 mg/L; 21d EC50: > 15.8 mg/L. All reported biological results are related to the nominal concentration. Based on these data, the calculated 21d-NOEC for cesium was 12.5 mg/L, the 21d-EC50 > 12.5 mg/L and the LOEC > 23.7 mg/L and for cesium chloride the calculated 21d-NOEC was 15.8 mg/L, the 21d-EC50>15.8 mg/L and the LOEC = 30.1 mg/L.

Toxicity to aquatic algae:

A toxicity study to aquatic algae and cyanobacteria with cesium chloride is not available. Consequently, read-across was applied using data from cesium hydroxide monohydrate. Under the conditions of this acute algal growth inhibition test on Pseudokirchneriella subcapitata the observed endpoints for the effect of cesium hydroxide monohydrate based on the growth rate were the following: 72h EC50 value: 133.99 mg test item/L; 72h NOEC value: 12.5 mg test item/L and 72h LOEC value: 25 mg test item/L. Based on these data the 72h-EC50 calculated for cesium was 106.1 mg/L., the 72h-LOEC was 19.8 mg/L and the 72h NOEC was 9.9 mg/L and for cesium chloride the calculated 72h-EC50 value was 134.3 mg/L, the 72h-LOEC was 25.1 mg/L and the 72h NOEC was 12.5 mg/L. All reported biological results are related to the nominal concentrations.

Toxicity to microorganisms:

A toxicity study to microorganisms with cesium chloride is not available. Consequently, read-across was applied using study from cesium hydroxide. Under the conditions of the performed Activated Sludge Respiration Inhibition Test, the EC10 and EC50 values of cesium hydroxide monohydrate were determined as higher than 1000 mg/L. Based on the statistical evaluation in this test the NOEC was 1000 mg/L for cesium hydroxide monohydrate. Based on these data, the calculated EC10 and EC50 values of cesium were greater than 792 mg/L and the NOEC was 792 mg/L and for cesium chloride the calculated values were as follows: EC10 and EC 50 >1003 mg/L and NOEC 1003 mg/L.

Please refer to IUCLID section 13 for read-across justification.