Sodium methanesulphonate

Short-term toxicity to aquatic invertebrates

Link to relevant study record(s)

Reference

Endpoint:

short-term toxicity to aquatic invertebrates

Type of information:

experimental study

Adequacy of study:

key study

Study period:

1997

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 202 (Daphnia sp. Acute Immobilisation Test)

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Specific details on test material used for the study:

None.

Analytical monitoring:

yes

Details on sampling:

One water sampled was removed from both replicate solutions of each treatment and control at 0 and 48 hours for analysis of methane sulfonic acid concentrations. Each exposure solution was collected from the approximate midpoint of the test vessel with a volumetric pipet.

Vehicle:

no

Details on test solutions:

The dilution water used during this study was from the same source as the water used in the daphnid cultures and had a total hardness and alkalinity as CaCo3 of 170 mg/L and 120 mg/L, respectively, a pH of 8.3 and a specific conductivity of 470 µmhos/cm. Representative samples of the dilution water source were analysed periodically for the presence of pesticides, PCBs and toxic metals. None of these compounds have detected as concentrations that are considered toxic in any of the water samples analyzed, in agreement with ASTM (1993) standard practice. In addition, representative samples of the dilution water source were analyzed monthly for total organic carbon (TOC) concentration. The TOC concenrations of the dilution water sources was 0.57 mg/L for the month of October 1997. Several species of daphnids are maintained in water from the same source as the dilution water used in the present study and have successfully survived and reproduced over several generations. The excellent performance of the cultured daphnids, in combination with the previously mentioned analyses, confirmed the acceptability of this dilution water for bioassays.

Test organisms (species):

Daphnia magna

Details on test organisms:

TEST ORGANISM
- Common name: Daphnia magna
- Strain/clone: Unknown
- Source: household at Springborn for generations
- Age of parental stock (mean and range, SD): Unknown
- Feeding during test: none

Test type:

static

Water media type:

freshwater

Limit test:

no

Total exposure duration:

48 h

Remarks on exposure duration:

Classic.

Post exposure observation period:

None.

Hardness:

Not measured

Test temperature:

19°C - 21°C (min - max)

pH:

6.4 - 8.1 (min - max)

Dissolved oxygen:

8.0 - 8.2 (min - max)

Salinity:

Freshwater

Conductivity:

Not measured

Nominal and measured concentrations:

Nominal concentrations: 0 ; 120 ; 210 ; 330 ; 570 ; 890 mg/L (active substance)
Measured concentrations were within [80;120]% of the nominal concentrations. The nominal concentrations were used for determination of the EC50.

Details on test conditions:

TEST SYSTEM
- Test vessel: 1-L glass beakers
- Fill volume: 500 mL
- Aeration: None
- Type of test: Static
- No. of organisms per vessel: 10
- No. of vessels per concentration (replicates): 2
- No. of vessels per control (replicates): 2

OTHER TEST CONDITIONS
- Adjustment of pH: Adjustment in the two highest concentrations
- Photoperiod: 16L:8D
- Light intensity: 60 footcandles at water surface

EFFECT PARAMETERS MEASURED (with observation intervals if applicable) : Mobility after 48 hours exposure.

Reference substance (positive control):

not specified

Key result

Duration:

48 h

Dose descriptor:

EC50

Effect conc.:

260 mg/L

Nominal / measured:

nominal

Conc. based on:

act. ingr.

Basis for effect:

mobility

Details on results:

The mean measured concentrations tested and the corresponding mortality data at 48 hours were used to estimate the 48h-EC50. EC50 was 260 mg/L

Results with reference substance (positive control):

None.

Reported statistics and error estimates:

Results were analysed with a probit regression method.

Validity criteria fulfilled:

yes

Conclusions:

The toxicity of methane sulfonic acid was tested against Daphnia magna in a GLP compliant OECD 202 guideline study. 48h-EC50 was 260 mg/L.

Executive summary:

The toxicity of methane sulfonic acid was tested against Daphnia magna in a GLP compliant OECD 202 guideline study. The experiment was performed in 1 -L glass beakers filled with 500 mL test solution. Tested nominal concentrations of methane sulfonic acid were 0 ; 120 ; 210 ; 330 ; 570 ; 890 mg/L (active substance). Each concentration was tested in duplicate. Ten daphnids (less than 24 hours old) were introduced in each of the two beakers. Exposure lasted 48 hours under static conditions. Test concentrations remained within 80% and 120% of nominal concentrations in all treatments at both 0 and 48 hours. 48h-EC50 was 260 mg/L.

Description of key information

A read-across was done for sodium methanesulphonate from methanesulphonic acid (see read-across justification). The toxicity of methane sulfonic acid was tested against Daphnia magna in a GLP compliant OECD 202 guideline study. The experiment was performed in 1 -L glass beakers filled with 500 mL test solution. Tested nominal concentrations of methane sulfonic acid were 0 ; 120 ; 210 ; 330 ; 570 ; 890 mg/L (active substance). Each concentration was tested in duplicate. Ten daphnids (less than 24 hours old) were introduced in each of the two beakers. Exposure lasted 48 hours under static conditions. Test concentrations remained within 80% and 120% of nominal concentrations in all treatments at both 0 and 48 hours. 48h-EC50 was 260 mg/L for methanesulphonic acid. The same toxicity value is considered for sodium methanesulphonate.

Key value for chemical safety assessment

Fresh water invertebrates

Fresh water invertebrates

Effect concentration:

260 mg/L