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EC number: 203-312-7
CAS number: 105-59-9
With high probability acutely not harmful to fish
Two acute fish studies were performed
according to German Industrial Standards DIN 38412, part 15 using
Leuciscus idus as test species (BASF AG, 1990, report no.
10F0990/885214; BASF AG, 1987, report no. 10F0333/875143). The results
indicate that the test substance is probably acutely not harmful to
fish. The 96-hour LC50 was determined to be >1000 and <2200
mg/L for not neutralized test solutions. In pelagic toxicity testing a
pH of 6.5 to 9.0 is generally accepted (REACH Guidance, R.7B). This
value was exceeded in the initial phase of all test item solutions. The
pH remained above the critical value of pH 9.0 in the test item
solutions of >= 2150 mg/L, which could have caused the high mortality in
these test solutions. It should be noted that the mortality was not
reduced after pH-adjustment of the highest concentration level (10000
mg/l). However, mortality was delayed. The observed mortalities were at
least partly due to the pH-shift in the higher test item concentrations.
An additional acute toxicity study using
juvenile sheepshead minnows in a semi-static approach resulted in a 96-h
LC50 of >1000 mg/L, therefore demonstrating comparable
endpoints between freshwater and marine fish species. The test solutions
were not neutralised prior to use (BASF AG, 2002; report no. V2489/03).
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