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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Ecotoxicological information

Short-term toxicity to fish

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Administrative data

Link to relevant study record(s)

Description of key information

96 h LC50 = > 1000 mg/L, 96 h NOEC = 1000 mg/L; Oncorhynchus mykiss; EPA OTS 797.1300; Collins (1993a)

Key value for chemical safety assessment

Fresh water fish

Fresh water fish
Effect concentration:
1 000 mg/L

Additional information

In the aquatic environment, boron is expected to be the active species of orthoboric acid, potassium salt. Boron is not considered toxic to fish as established by numerous acute toxicity studies. Additionally, orthoboric acid, potassium salt was tested as manufactured (45% w/w in highly refined mineral oil) in Oncorhynchus mykiss (rainbow trout) in accordance with standardised guideline EPA OTS 797.1400. During the test the fish were exposed to the test material at nominal concentrations of 0, 130, 220, 360, 600 and 1000 mg/L under semi-static renewal conditions; all tests conducted using water soluble fractions. Under the conditions of the study, no mortality or sub-lethal effects were observed at any of the treatment levels tested. The 96 hour LC50 was subsequently determined to be >1000 mg/kg. The NOEC was determined to be 1000 mg/kg. The study was performed in line with GLP and an accepted standardised guideline with a high standard of reporting and assigned a reliability score of 1.