L-arginine phosphate

Short-term toxicity to fish

Administrative data

Endpoint:

short-term toxicity to fish

Type of information:

experimental study

Adequacy of study:

key study

Study period:

1991-09-30 to 1992-05-20

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: GLP guidline study whit acceptable restrictions

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

1992

Report date:

1992

Materials and methods

Test guideline

Qualifier:

according to guideline

Guideline:

OECD Guideline 203 (Fish, Acute Toxicity Test)

Deviations:

no

GLP compliance:

yes

Test material

Test material information

Constituent 1

Reference substance name:

Arginine

EC Number:

200-811-1

EC Name:

Arginine

Cas Number:

74-79-3

Molecular formula:

C6H14N4O2

IUPAC Name:

arginine

Test material form:

not specified

Sampling and analysis

Analytical monitoring:

no

Test solutions

Vehicle:

no

Details on test solutions:

PREPARATION AND APPLICATION OF TEST SOLUTION
- Method: The test substance was weighed out and each portion was dissolved in 1l dilution water.
- Eluate: the dilution water used was DSWL, prepared from groundwater.
- Controls: DSWL (negative control).
- Evidence of undissolved material (e.g. precipitate, surface film, etc) visually.

Test organisms

Test organisms (species):

Danio rerio (previous name: Brachydanio rerio)

Details on test organisms:

- Common name: zebrafish
- Source: M.B. Ruysbroek B.V., Noordvliet 159, NL-Maassluis
- Length at initiation (length definition, mean, range and SD): 2.2 +/- 0.1 cm (SD)
- Weight at study initiation (mean and range, SD): 0.09 +/- 0.02 g (SD)
- Feeding during test: no

Study design

Test type:

semi-static

Water media type:

freshwater

Limit test:

no

Total exposure duration:

96 h

Test conditions

Hardness:

Hardness, expressed as CaCO3: 204 mg/l

Test temperature:

24.2 to 24.6 °C

pH:

Control medium: Begining of test: 7.8 to 8.0 End of test 7.6 to 7.9
1 g/l test substance: Begining of test: 9.3 to 9.5 End of test 8.6 to 8.8
1.8 g/l test substance: Begining of test: 9.5 to 9.7 End of test 8.8 to 9.0
3.2 g/l test substance: Begining of test: 9.7 to 9.9 End of test 9.1 to 9.2
5.6 g/l test substance: Begining of test: 9.9. End of test 9.5
10 g/l test substance: Begining of test: 10.1 End of test 9.7

Dissolved oxygen:

Control medium: Begining of test: 7.8 to 8.4 mg/l. End of test 7.2 to 8.3 mg/l.
1 g/l test substance: Begining of test: 7.8 to 8.4 mg/l. End of test 7.2 to 9.1 mg/l.
1.8 g/l test substance: Begining of test: 7.9 to 8.3 mg/l. End of test 7.3 to 8.2 mg/l.
3.2 g/l test substance: Begining of test: 7.9 to 8.3 mg/l. End of test 7.2 to 8.2 mg/l.
5.6 g/l test substance: Begining of test: 8.1 mg/l. End of test 8.3 mg/l.
10 g/l test substance: Begining of test: 8.3 mg/l. End of test 8.4 mg/l.

Salinity:

Not applicable

Nominal and measured concentrations:

Nominal concentrations of testsubstance: 1.0, 1.8, 3.2, 5.6, 10 g/l

Details on test conditions:

TEST SYSTEM
- Test vessel: all-glass beakers
- Type: open
- Material, size, headspace, fill volume: glass, 2000 ml
- Aeration: slightly aerated
- Renewal rate of test solution (frequency/flow rate): daily
- No. of organisms per vessel: 10
- No. of vessels per concentration (replicates): 1
- No. of vessels per control (replicates): 1

TEST MEDIUM / WATER PARAMETERS
- Source/preparation of dilution water: Groundwater from Linschoten (the Netherlands). The medium is prepared by adding several salts.
- Total organic carbon: 1.5 mg/l
- Metals: << 1 mg/l
- Chlorine: 2.71 mml/l
- Na+: 1.19 mmol/l
- K+: 0.22 mmol/l
- Ca 2+: 1.30 mmol/l
- Mg2+. 0.74 mmol/l
- SO42-: 0.69 mmol/l
- Ca/Mmg ratio: 1.76
- Culture medium different from test medium: yes
- Intervals of water quality measurement: Once prior to beginning for the above paramters

OTHER TEST CONDITIONS
- Adjustment of pH: no
- Photoperiod: 16 h light - 8 h dark, with transition periods of 30 minutes

EFFECT PARAMETERS MEASURED (with observation intervals if applicable) : LC50, LC 100, NOEC (mortality = 96h LC0), NOEC (condition after 96 h).
Condition: Swimming behaviour, colour, respiratory function, any other morphological or visual behavioural criterion after 24 h, 48 h, 72 h and 96 h.

TEST CONCENTRATIONS
- Test concentrations: 1.0, 1.8, 3.2, 5.6, 10 g/l

Reference substance (positive control):

no

Results and discussion

Effect concentrations

Effect concentrations 1

Duration:

96 h

Dose descriptor:

NOEC

Effect conc.:

1 g/L

Nominal / measured:

nominal

Conc. based on:

test mat.

Basis for effect:

behaviour

Remarks:

: Swimming behaviour, colour, respiratory function, any other morphological or visual behavioural criterion

Remarks on result:

other: NOEC (condition)

Effect concentrations 2

Duration:

96 h

Dose descriptor:

NOEC

Effect conc.:

1.8 g/L

Nominal / measured:

nominal

Conc. based on:

test mat.

Basis for effect:

mortality (fish)

Remarks:

(= 96h LC0)

Remarks on result:

other: One animal was dead at 1.8 g/l, but because mortality (in the control) is allowed according to OECD 203, this concentration is recorded as the 96h NOEC, with regard to mortality as criterion.

Effect concentrations 3

Duration:

96 h

Dose descriptor:

LC100

Effect conc.:

5.6 g/L

Nominal / measured:

nominal

Conc. based on:

test mat.

Basis for effect:

mortality (fish)

Effect concentrations 4

Duration:

96 h

Dose descriptor:

LC50

Effect conc.:

2.8 g/L

Nominal / measured:

nominal

Conc. based on:

test mat.

Basis for effect:

mortality (fish)

Remarks on result:

other: 95% confidence interval: 2.3 - 3.3 g/l

Details on results:

It is likely that the results of the test are seriously affected by the high pH value.

- Behavioural abnormalities: At concentrations of 1.8 g/l and 3.2 g/l L-arginine slow swimming fishes, fishes with disturbed equilibrium, fishes swimming near the surface of the test vessel, fishes with a darker colour and fishes making nervous movements were observed.
- Observations on body length and weight: none
- Other biological observations: none
- Mortality of control: no
- Other adverse effects control: no
- Abnormal responses: no
- Any observations (e.g. precipitation) that might cause a difference between measured and nominal values: The test substance appeared to be completely dissolved at all concentrations tested at the beginning of the test (visually assesed). After 24 h undissolved material was observed on the bottom of the vessel at all concentrations tested; the amount of undissolved material increased with the concentration.
- Effect concentrations exceeding solubility of substance in test medium: see above

Applicant's summary and conclusion

Validity criteria fulfilled:

yes

Conclusions:

The acute toxicity of L-arginine to fish was determined according to OECD guideline 203.
The test results were: LC50 = 2.8 g/l; LC 100 = 5.6 g/l; NOEC (mortality) = 1.8 g/l; NOEC (condition) = 1.0 g/l.