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EC number: 233-332-1 | CAS number: 10124-37-5
The acute toxicity of Potassium sodium nitrate to rainbow trout was investigated in a test according to OECD203 and GLP.
Test concentrations were confirmed by chemical analysis (nitrate measurements).
The nominal 96h-LC50 > 100 mg/L and the NOEC is 100 mg/L.
LC50= 191 mg N/L (1378 mg KNO3/L; 845 mg NO3/L)
Additional studies with ammonia alone and mixtures of ammonia and potassium nitrate indicated that the toxicities were simply additive except at very low ammonia to nitrate ratios.
In a static study with potassium nitrate performed equivalent to OECD 203, only with fry stage fish (younger fish, considered to be a worst case) were exposed to a series of concentrations of potassium nitrate and nitrate concentrations were measured. Based on the measured concentration of nitrate the LC50 of potassium nitrate was calculated to be 1378 mg/L.
No reliable study with calcium nitrate is available. Based on reliable studies with potassium nitrate, potassium sodium nitrate and ammonium nitrate, the 96h-LC50 is >100 mg/L for fish. The read-across rationale can be found in the document attached in the appropriate target records.
No reliable study with calcium nitrate is available. In a reliable OECD 203 study in Oncorhynchus mykiss with potassium sodium nitrate, the nominal 96h-LC50 was determined to be >100 mg/L (confirmed by chemical analysis). No lethal or sublethal effects were noted at the highest concentration tested. Potassium sodium nitrate concentrations were calculated from total nitrate measurements. This is confirmed in a study with potassium nitrate itself, in a static study performed equivalent to OECD 203, only with fry stage fish (younger fish, considered to be a worst case). They were exposed to a series of concentrations of potassium nitrate and nitrate concentrations were measured. Based on the measured concentration of nitrate, the 96h-LC50 of potassium nitrate was calculated to be 1378 mg/L. In addition a study with ammonium nitrate in carp is available. The 48h-LC50 of ammonium nitrate was calculated to be 447 mg/L.
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