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EC number: 233-469-7 | CAS number: 10192-30-0
- Life Cycle description
- Uses advised against
- Endpoint summary
- Appearance / physical state / colour
- Melting point / freezing point
- Boiling point
- Density
- Particle size distribution (Granulometry)
- Vapour pressure
- Partition coefficient
- Water solubility
- Solubility in organic solvents / fat solubility
- Surface tension
- Flash point
- Auto flammability
- Flammability
- Explosiveness
- Oxidising properties
- Oxidation reduction potential
- Stability in organic solvents and identity of relevant degradation products
- Storage stability and reactivity towards container material
- Stability: thermal, sunlight, metals
- pH
- Dissociation constant
- Viscosity
- Additional physico-chemical information
- Additional physico-chemical properties of nanomaterials
- Nanomaterial agglomeration / aggregation
- Nanomaterial crystalline phase
- Nanomaterial crystallite and grain size
- Nanomaterial aspect ratio / shape
- Nanomaterial specific surface area
- Nanomaterial Zeta potential
- Nanomaterial surface chemistry
- Nanomaterial dustiness
- Nanomaterial porosity
- Nanomaterial pour density
- Nanomaterial photocatalytic activity
- Nanomaterial radical formation potential
- Nanomaterial catalytic activity
- Endpoint summary
- Stability
- Biodegradation
- Bioaccumulation
- Transport and distribution
- Environmental data
- Additional information on environmental fate and behaviour
- Ecotoxicological Summary
- Aquatic toxicity
- Endpoint summary
- Short-term toxicity to fish
- Long-term toxicity to fish
- Short-term toxicity to aquatic invertebrates
- Long-term toxicity to aquatic invertebrates
- Toxicity to aquatic algae and cyanobacteria
- Toxicity to aquatic plants other than algae
- Toxicity to microorganisms
- Endocrine disrupter testing in aquatic vertebrates – in vivo
- Toxicity to other aquatic organisms
- Sediment toxicity
- Terrestrial toxicity
- Biological effects monitoring
- Biotransformation and kinetics
- Additional ecotoxological information
- Toxicological Summary
- Toxicokinetics, metabolism and distribution
- Acute Toxicity
- Irritation / corrosion
- Sensitisation
- Repeated dose toxicity
- Genetic toxicity
- Carcinogenicity
- Toxicity to reproduction
- Specific investigations
- Exposure related observations in humans
- Toxic effects on livestock and pets
- Additional toxicological data
![](https://poisoncentres.echa.europa.eu/o/diss-blank-theme/images/factsheets/A-REACH/factsheet/print_toxicological-information.png)
Skin sensitisation
Administrative data
- Endpoint:
- skin sensitisation: in vivo (LLNA)
- Type of information:
- read-across based on grouping of substances (category approach)
- Adequacy of study:
- key study
- Study period:
- 2010-05-19 to 2010-07-08
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Justification for type of information:
- see attachment “Read-across concept – Human Health/Environment - Category approach for Inorganic sulfites/thiosulfates/dithionite" in section 13.
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 010
- Report date:
- 2010
Materials and methods
Test guideline
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 429 (Skin Sensitisation: Local Lymph Node Assay)
- Version / remarks:
- 2002-04-24
- Deviations:
- yes
- Remarks:
- , modified OECD 429, method according to Ehlings et al. 2005
- Principles of method if other than guideline:
- The test was performed in accordance with the method according to Ehling et al (2005): An european inter-laboratory validation of alternative endpoints of the murine local lymph node assay: first round, Toxicology 212 (2005) 60-68 and Ehling et al (2005): An european inter-laboratory validation of alternative endpoints of the murine local lymph node assay: 2nd round, Toxicology 212 (2005) 69-79.
Threshold values of the stimulation indices of lymph node cell count and ear weight were calculated by dividing the average values per group of the test item treated animals by the vehicle treated ones. Values above 1.4 (cell count) or 1.1 (ear weight) are considered positive
(these values were fixed empirically during the inter-laboratory validation of this method). In addition, the lymph node weights were determined for concentration related properties. - GLP compliance:
- yes (incl. QA statement)
- Remarks:
- signed 2009-11-12
- Type of study:
- mouse local lymph node assay (LLNA)
Test material
- Reference substance name:
- Disodium disulphite
- EC Number:
- 231-673-0
- EC Name:
- Disodium disulphite
- Cas Number:
- 7681-57-4
- Molecular formula:
- Na2S2O5
- IUPAC Name:
- disodium disulphite
- Test material form:
- solid: particulate/powder
- Details on test material:
- - Name of test material (as cited in study report): Sodium metabisulfite (Sodium pyrosulfite)
- Molecular formula: Na2S2O5
- Molecular weight: 190.11 g/mol
- Physical state: Solid, white powder
- Decomposition: ≥ 150°C [MSDS]
Constituent 1
- Specific details on test material used for the study:
- STABILITY AND STORAGE CONDITIONS OF TEST MATERIAL
- Storage condition of test material: Cool and dry, well ventilated place
In vivo test system
Test animals
- Species:
- mouse
- Strain:
- NMRI
- Sex:
- female
- Details on test animals and environmental conditions:
- TEST ANIMALS
- Source: Charles River Laboratories, Research Models and Services Germany GmbH, Sandhofer Weg 7, 97633 Sulzfeld, Germany
- Age at study initiation: approx. 9 weeks
- Weight at study initiation: 25 - 30 g
- Housing: The animals were kept singly in MAKROLON cages (type III) with a basal surface of approx. 39 cm x 23 cm and a height of approx. 15 cm. Granulated textured wood (Granulat A2, J. Brandenburg, 49424 Goldenstedt, Germany) was used as bedding material for the cages.
- Diet (ad libitum): Commercial diet ssniff® R/M-H V1534 (ssniff Spezialdiäten GmbH, 59494 Soest, Germany)
- Water (ad libitum): Tap water
- Acclimation period: At least 5 days
ENVIRONMENTAL CONDITIONS
- Temperature: 22°C +/- 3°C (maximum range)
- Relative humidity: 55% +/- 15% (maximum range)
- Air changes: 12 - 18 times per hour
- Photoperiod (hrs dark / hrs light): 12/12
Study design: in vivo (LLNA)
- Vehicle:
- other: aqua ad iniectabilia
- Concentration:
- 10 % w/w, 25 % w/w, and 50 % w/w of sodium metabisulfite
- No. of animals per dose:
- 6 female mice
- Details on study design:
- RANGE FINDING TESTS:
A preliminary experiment was carried out in 3 animals to examine the irritating potential and handling/application of the test item in order to select the appropriate concentrations. Three concentrations of 10, 25 and 50% of sodium metabisulfite in aqua ad iniectabilia were examined.
Results:
In the preliminary experiment, concentrations of 10%, 25% and 50%, employing 1 animal per concentration, were examined. No pronounced irritating properties were observed in this preliminary experiment at concentrations of 10%, 25% or 50%, no differences in ear weight and ear thickness were noted.
MAIN STUDY
The test item had to be dissolved in aqua ad iniectabilia (Batch no. 911728; Delta Select, 63303 Dreieich, Germany). Due to the chemical properties of sodium metabisulfite no suitable homogeneous dosage form could be obtained with less polar, aprotic solvents.
The test item solution was administered to the dorsum of both animal's ears at an application volume of 25 µL/ear.
The experimental schedule of the assay was as follows:
Day 1:
The weight of each animal was individually identified and recorded. In addition, ear swelling measurements were carried out at the helical edge of both ears using an Oditest micrometer.
Open application of 25 µL of the appropriate dilution of the test item, the vehicle alone or the positive control (as appropriate) were administered to the dorsum of each ear.
Days 2 and 3:
The application procedure carried out on day 1 was repeated.
Day 4 (24 hours after the last application the animals were sacrificed under ether anaesthesia by cutting the aorta abdominalis):
Ear swelling measurements (immediately before sacrificing the mice) were carried out at the helical edge of both ears using an Oditest micrometer.
Punch biopsies of 8 mm in diameter of the apical area of both ears were prepared and immediately weighed on an analytical balance.
Lateral pairs of auricular lymph nodes draining the ear tissue were excised, carefully separated from remaining fatty tissue and weighed on an analytical balance immediately following preparation. The lymph nodes were then stored on ice in PBS/0.5% BSA and subjected to the preparation of single cell suspensions by mechanical tissue disaggregation. The cells were counted automatically in a cell counter.
OBSERVATIONS.
The following observations were made during the course of the study:
Clinical signs: Animals were observed once daily for any clinical signs of local systemic irritation at the application site or of systemic toxicity. Observations were recorded for each individual animal. Cageside observations included skin/fur, eyes, mucous membranes, respiratory and circulatory systems, somatomotor activity and behaviour patterns. The onset, intensity and duration of any signs observed were recorded.
In addition, animals were checked regularly throughout the working day from 7:30 a.m. to 4:30 p.m. On Saturdays and Sundays animals were checked regularly from 8:00 a.m. to 12:00 noon with a final check performed at approximately 4:00 p.m., if applicable.
Body weight: The weight of each mouse was recorded at the time of allocation of animals to groups (test day 1) and at the time of necropsy (test day 4).
ANALYSIS OF RESULTS:
The so-called stimulation (or LLN-) indices to determine the sensitising potential were calculated by dividing the average absolute lymph node weight or lymph node cell counts per group of the test item treated animals by the vehicle treated ones.
Thus, in case of no stimulating effect the index for the lymph node cell count is always below 1.4 (cut-off value). An index above 1.4 is considered positive.
For lymph node weight significance at p ≤ 0.01 is considered positive (U-test according to MANN and WHITNEY). A possible concentration-response-relationship for the lymph node weight in order to determine a possible sensitising potential was examined by linear regression analysis employing PEARSON's correlation coefficient. Outliers were determined according to the NALIMOV test.
In addition, the acute inflammatory skin reaction (irritating potential) was measured by ear weight determination of circular biopsies of the ears and ear thickness measurements on test day 1 and test day 4 to identify skin irritation properties of the test item employing the U-test according to MANN and WHITNEY by comparing the test groups to the vehicle control.
The stimulation indices were calculated by dividing the average ear weight and average ear thickness on test day 4 per group of the test item treated animals by the vehicle treated ones. The cut-off threshold value for ear weight was set at 1.1. - Positive control substance(s):
- hexyl cinnamic aldehyde (CAS No 101-86-0)
- Statistics:
- Please refer to "Details on study design".
Results and discussion
- Positive control results:
- The positive control group caused the expected increases in lymph node cell count (S.I.: 2.427) and lymph node weight (S.I.: 2.160) (statistically significant at p ≤ 0.01). Therefore, the study is regarded as valid. The stimulation index for ear weight was 1.033.
In vivo (LLNA)
Resultsopen allclose all
- Key result
- Parameter:
- SI
- Remarks:
- lymph node cell count
- Value:
- 0.854
- Test group / Remarks:
- 10 % w/w test item
- Remarks on result:
- other: SI: 0.800 (lymph node weight)
- Key result
- Parameter:
- SI
- Remarks:
- ear weight
- Value:
- 0.934
- Test group / Remarks:
- 10 % w/w test item
- Remarks on result:
- other: SI: 1.009 (ear thickness)
- Key result
- Parameter:
- SI
- Remarks:
- lymph node cell count
- Value:
- 0.97
- Test group / Remarks:
- 25 % w/w test item
- Remarks on result:
- other: SI: 1.200 (lymph node weight)
- Key result
- Parameter:
- SI
- Remarks:
- ear weight
- Value:
- 1.086
- Test group / Remarks:
- 25 % w/w test item
- Remarks on result:
- other: SI: 1.000 (ear thickness)
- Key result
- Parameter:
- SI
- Remarks:
- lymph node cell count
- Value:
- 0.878
- Test group / Remarks:
- 50 % w/w test item
- Remarks on result:
- other: SI: 1.171 (lymph node weight)
- Key result
- Parameter:
- SI
- Remarks:
- ear weight
- Value:
- 1.02
- Test group / Remarks:
- 50 % w/w test item
- Remarks on result:
- other: SI: 1.027 (ear thickness)
- Cellular proliferation data / Observations:
- DETAILS ON STIMULATION INDEX CALCULATION
Threshold values of the stimulation indices of lymph node cell count and ear weight were calculated by dividing the average values per group of the test item treated animals by the vehicle treated ones. Values above 1.4 (cell count) or 1.1 (ear weight) are considered positive (these values were fixed empirically during the inter-laboratory validation of this method)
RESULTS ON SKIN SENSITISATION
Treatment with sodium metabisulfite at concentrations of 10%, 25% or 50% did not reveal statistical significantly increased values for lymph node cell count, all stimulation indices for the lymph node cell count were beneath the threshold value of 1.4. In addition, the lymph node weight was not increased. Hence, the test item is classified as not sensitising.
The threshold level for the ear weight of 1.1 was not exceeded, i.e. no irritating properties were noted.
(Please refer to "Attached background material" for the raw data on stimulation indices.)
CLINICAL OBSERVATIONS
No signs of local or systemic intolerance were recorded.
BODY WEIGHTS
The animal body weight was not affected by the treatment.
Applicant's summary and conclusion
- Interpretation of results:
- GHS criteria not met
- Conclusions:
- The substance is not a skin sensitiser.
According to Regulation (EC) No 1272/2008 and subsequent adaptations, the substance does not require classification as skin sensitiser.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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