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EC number: 215-158-8 | CAS number: 1308-14-1
- 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
Endpoint summary
Administrative data
Description of key information
Additional information
Chromium(III) hydroxide is insoluble between pH 6.8 and 11.5 (see section 4.8). The main toxic principle of Chromium(III) hydroxide is dissolved Cr(III). Therefore significant aquatic toxicity is not expected in this pH range, because Cr(III) is not available. There are a number of studies available for water soluble Cr(III) salts, that cover the pH range < pH 6.8 and > pH11.5. In general aquatic toxicity of soluble Chromium(III) varies with water hardness.
Acute toxicity for fish varies between 96h LC50 = 2 mg/Chromium(III)/L (Rainbow trout, Chromium(III)nitrate) to 72 mg Chromium(III)/L (Bluegill, Chromium(III) potassium sulphate). The result for the marine fish Yellow eye mullet fits well with 96h LC50 = 31.5 mg Chromium(III)/L (Chromium(III) chloride).
72 d Chronic toxicity to fish was NOEC 0.05 mg Chromium(III)/L for survival of newly fertilized eggs to 30-day post-swim-up of rainbow trouts.
48h acute toxicity for Daphnia magna ranges between EC50 = 17 – 59 mg Chromium(III)/L (Chromium(III)nitrate) depending on water hardness. For a variety of freshwater and marine invertebrates 96h LC50 is 2 – 442 mg Chromium(III) /L (Chromium(III) chloride).
Chronic toxicity of for Daphnia magna is reported to be 21d NOEC 0.7 mg Chromium(III) /L for reproduction. In another study the 21 d LC50 was 2 mg Chromium(III)/L mortality and the 21 d EC50 reproductive impairment 0.6 mg Chromium(III) /L Chromium(III) chloride (Daphnia magna). For the stone fly a 7 d LC50 of 32 mg Chromium(III) /L based on mortality is reported. For the Polychaete Neanthes arenaceodentata the 293 d NOEC for behaviour and reproduction was 50.4 mg Chromium(III) /L. All studies were performed with Chromium(III)chloride.
For freshwater algae and marine diatoms 96 h EC50 data for are 0.3 - 0.4 mg Chromium(III)/L (Pseudokirchnerella subcapitata) and 96 h EC50 2 mg Chromium(III) /L (Ditylum brightwellii) (Chromium(III)chloride)
The 9 h IC50 is 50 mg Chromium(III)/L for Tetrahymena pyriformis (growth inhibition) (Chromium(III)chloride). In another study large decreases in Cr(III) concentrations at pH 6.5 occurred because of the low solubility of Cr(III) at that pH. Significantly growth rate inhibition of mixed bacterial population was observed in two of four samples at the 100 mg/L level in the non-aerated samples. Higher growth rates were found at 10mg/L in the aerated samples.
Based on the available information it was concluded that chromium(III)hydroxide is not acute toxic for the aquatic environment, since all soluble chromium(III)-compounds show a toxicity of > 1 mg/l to aquatic organisms.
Further assessment is needed to conclude on the chronic toxicity of chromium(III)hydroxide for aquatic organisms
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