4,4'-methylenedicyclohexyl diisocyanate

Short-term toxicity to fish

Link to relevant study record(s)

Reference

Endpoint:

short-term toxicity to fish

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

guideline study with acceptable restrictions

Qualifier:

according to guideline

Guideline:

EU Method C.1 (Acute Toxicity for Fish)

Version / remarks:

Cited as Directive 92/69/EEC, C.1

GLP compliance:

yes

Analytical monitoring:

yes

Vehicle:

no

Details on test solutions:

To accelerate the solution procedure a five fold amount (30 mg/1) of the maximum water solubility of the test substance in the
preliminary test (6 mg/1) was weighed into water, treated for 60 seconds at 8000 rpm.with an ultra-turrax and afterwards stirred
an a magnetic stirrer for 24 hours. To remove undissolved particles, the resulting emulsion was filtered using a folded filter of the
pore size 7-12 gm.

Test organisms (species):

Danio rerio (previous name: Brachydanio rerio)

Details on test organisms:

TEST ORGANISM:
- supplier: Bio International B.V. (Netherlands)
- body length: 2.5 - 3.5 cm
- medication: none
- mortalities during acclimatization: < 2 %
- keeping water: synthetic fresh water in accordance with ISO

Test type:

static

Water media type:

freshwater

Limit test:

yes

Total exposure duration:

96 h

Hardness:

total hardness 14.1 °dH (251.5 mg/l CaCO3)

Test temperature:

The temperature varied between 21.3 – 21.8 °C (daily monitoring)

pH:

pH-values varied betweeen 7.8 – 8.0 (daily monitoring)

Dissolved oxygen:

Oxygen concentration varied between 8.1 – 8.6 mg/l (daily monitoring)

Salinity:

No data

Nominal and measured concentrations:

Nominal concentration of test substance : 6 mg/l (Analytical value after 0 h: 4 mg/l, after 96 h: 6 mg/l, resp.)

Details on test conditions:

TEST SYSTEM:
- keeping water: synthetic fresh water according to ISO 7346
- photoperiod: 16 hours light, 8 hours dark
- temperature: 20 - 24 °C
- ventilated
- no feeding during test
- test vessel: glass aquarium, 5 l test media
- number of fish per test vessel: 10
- method of administration: direct weighing
- solubilizer or other auxiliaries: ultra-Turrax, magnetic stirrer, folded filter
- test concentration: 6 mg/l plus one control
- test parameter: mortality (recorded daily)

Duration:

96 h

Dose descriptor:

LC0

Effect conc.:

>= 8.1 mg/L

Nominal / measured:

meas. (arithm. mean)

Conc. based on:

other: determined as TOC and back-calculated to the parent compound

Basis for effect:

mortality (fish)

Remarks on result:

other: Arithmetic mean of analytical values

Details on results:

The above test result refers to a concentration of the test substance which was calculated directly from analytically determined TOC values.

Executive summary:

For fish (Danio rerio) a LC0 of >= 8.1 mg/l after 96 h was obtained for 4,4-methylenedicyclohexyl diisocyanate. The study was conducted according to Directive 92/69/EEC, C1 (Bayer AG, 2000). The result relates to the arithmetic mean of analytical values.

Description of key information

Acute toxicity to fish (Danio rerio) has been investigated in a limit test under static conditions according to Directive 92/69/EEC, C.1. A concentration of 30 mg/l 4,4’-methylenedicyclohexyl diisocyanate was pretreated before start as described above. A 96 h-LC50 of > 8.1 mg/l was observed (Bayer AG, 2000b). At this concentration level 10 % mortality was detected, however, in a range finding test no mortality occurred at the highest concentration tested of 6 mg/l (nominal).

Key value for chemical safety assessment

Fresh water fish

Fresh water fish

Dose descriptor:

LC50

Effect concentration:

8.1 mg/L

Additional information

Should read >8.1 mg/L