Registration Dossier
Registration Dossier
Diss Factsheets
Use of this information is subject to copyright laws and may require the permission of the owner of the information, as described in the ECHA Legal Notice.
EC number: 934-716-8 | CAS number: -
- 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

Long-term toxicity to fish
Administrative data
Link to relevant study record(s)
Description of key information
For H2S toxicity, several studies yielded reliable NOEC values for freshwater fish. For marine fish, no reliable studies were identified. The study of Smith et al. (1976a) was considered as the key study. This study yielded a 826-d NOEC of 0.0046 mg H2S/L based on mortality data for juvenile bluegill (Lepomis macrochirus). No long-term data were identified for sulfate toxicity.
Key value for chemical safety assessment
Fresh water fish
Fresh water fish
- Effect concentration:
- 0.005 mg/L
Additional information
Toxicity studies investigating the toxicity of Na2S or NaHS to aquatic organisms have focused in most cases on the toxicity of H2S, which is the most toxic sulfur species that can be formed upon dissolution of Na2S and NaHS. Among the available studies using either Na2S, NaHS (or its respective hydrates) or H2S as test substance, the study of Smith et al. (1976a) yielded the lowest unbound NOEC, i.e. a 826-d NOEC of 0.0046 mg H2S/L based on mortality data for juvenile bluegill (Lepomis macrochirus). Next to a series of long-term studies, several studies have been identified reporting reliable LC50, EC50 or NOEC values obtained in short-term toxicity tests on embryo and sac-fry stages. Most of the effect concentrations reported were higher than the key NOEC reported by Smith et al. (1976a), except for a slightly lower 96-h EC50 value of 0.0028 mg H2S/L reported by Yusoff et al. (1998) for hatching rate of Javanese carp eggs (Puntius gonionotus). However, because such short-term studies should not be given as much weight as the long-term studies, and the lowest effect concentration is only slightly lower than the NOEC of Smith et al. (1976a), the latter will be used for the aquatic hazard assessment. No reliable information was identified for marine fish. No reliable long-term data were identified for sulfate toxicity.
No reliable long-term data were found for the toxicity of NaOH or Na2CO3, although one NaOH study, Rustamova (1977), with guppy (Lebistes reticulatus) reporting "significant changes in the biology of the fish" at 25 -100 mg/L is included in the dossier.
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.
Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
