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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
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Additional information on environmental fate and behaviour
Administrative data
- Endpoint:
- additional information on environmental fate and behaviour
- Type of information:
- experimental study
- Adequacy of study:
- supporting study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- study well documented, meets generally accepted scientific principles, acceptable for assessment
Data source
Reference
- Reference Type:
- publication
- Title:
- The sulfur cycle of freshwater sediments: Role of thiosulfate
- Author:
- Jørgensen, BB
- Year:
- 1 990
- Bibliographic source:
- Limnol. Oceanogr., 35(6), 1990, 1329-1342
Materials and methods
Test guideline
- Qualifier:
- no guideline followed
- Principles of method if other than guideline:
- The study investigated the fate of thiosulfate (S2O32-) in anoxic river and lake sediments using radio isotopic labelling with focus on the metabolic process of S2O32-/ sulfite disproportionation by sulfate-reducing bacteria.
- GLP compliance:
- no
Test material
- Specific details on test material used for the study:
- Radiotracers: H235S was prepared from 35S elemental S (Amersham) by Cr reduction just before the experiments. S2O32- tracer was obtained from Amersham with either the inner or outer S atom labelled with 35S. The radiochemical purity was 99% for the outer label and 96-98% for the inner label. Carrier-free 35SO42- was obtained from the Isotope Laboratory, Risø, Denmark.
Results and discussion
Any other information on results incl. tables
SO42-concentrations on Odder River and Brabrand Lake water at the time of sampling amounted to approx. 450 µM with a maximum (>550 µM) at a depth of 1-2 cm, indicating a zone of intense sulfide oxidation, presumably caused by microbial activity. At deeper levels, i.e. at a depth of 4-10 cm, SO42-was gradually depleted, presumably due to SO42-reduction. Neither S2O32-nor free sulfide was detected in pore water (< 1 µM).
In both sediments investigated, S2O32-was consumed at a constant rate and depleted after 5-6 h.
- Odder river experiments:
In river sediments, S2O32-was consumed at a constant rate and depleted after 5-6 h, however with minor contribution of oxidative processes (approx. 7%). About 50% of the consumed S2O32-got reduced to SO42-, presumably by SO42-- reducing bacteria. Upon S2O32-depletion, the SO42-pool started to decrease again due toSO42-reduction. SO42-reduction processes, however, were relatively slow.
Regarding the H235S tracer addition, rapid conversion into both SO42-and S2O32-occurred by immediate oxidation after addition of the tracer. However, a total of only 10% of the added H235S tracer appeared in oxidized pools, whereas the rest was bound iron as FeS/FeS2.
- Lake Brabrand:
In lake Brabrand sediments, S2O32-was consumed at a constant rate and depleted after 2 h, again with minor contribution of oxidative processes (approx. 6%). During S2O32-consumption, the labelled sulphur was equally distributed between SO42-and reduced sulphur, with about 50% of the inner (oxidized) S atom of S2O32-truly being reduced to sulphide. Regarding SO42-, reduction proceeded at a constant, however relatively slow rate as seen in sediments of the Odder river.
Total conversion percentages of S2O32-and SO42-were further calculated as the sum of all relevevant processes, including oxidative and reductive processes as well as disproportionation:
S2O32- -> 72% H2S + 28% SO42-
H2S -> 47.5% recycled + 52.5% oxidized (i.e. SO42-), with “recycled” referring t H2S that was converted to S2O32-and then recycled to H2S by reduction and disproportionation.
It is hypothesized that continuous cycling of new and regenerated H2S will ultimately lead to oxidation to SO42-percentages of >28%. Regarding the H235S tracer addition, rapid conversion of H235S into both SO42-(34%) and S2O32-(66%) occurred.
Applicant's summary and conclusion
- Conclusions:
- The fate of different sulphur compounds, i.e. H2S, S2O32- and SO42- was monitored in freshwater sediments using radiotracers. Regarding the H235S tracer addition, rapid conversion of H235S into both SO42- (34%) and S2O32- (66%) occurred. In addition, thiosulfates were converted into 72% H2S and 28% SO42- with the resulting 72% H2S again being subject to oxidation into SO42- in subsequent reactions. It is therefore hypothesized that continuous cycling of new and regenerated H2S will ultimately lead to SO42- oxidation percentages of >>28% and an ultimate transformation to sulphate is likely to occur in freshwater sediments under anoxic conditions. The study however only focussed on the turnover to SO42-, S2O32- and total reduced sulphur pools (reduced sulphur = H2S, FeS, FeS2, S0), therefore ignoring potential other products such as sulphites or polythionates.
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