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EC number: 241-543-5 | CAS number: 17572-97-3
- 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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Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
Description of key information
The biodegradability of K3HEDTA is driven by the EDTA component of the substance. Several tests on EDTA have been conducted and varying rates of biodegradation were observed. Ultimately, EDTA is biodegradable by adapted organisms and or a change in pH.
It could be shown in three different experiments that a change of the pH-value can result in a biodegradation of EDTA. In a SCAS facility which had been inoculated with activated sludge from a municipal wastewater treatment plant, a removal by biodegradation of EDTA (65 mg/L) added to domestic wastewater could be observed at pH of 8.0 to 9.0. With a pH of 6.5 no biodegradation could be obtained. The removal at pH 8.5 started 3 weeks after inoculation with a result up to 100 % degradation after 28 days. The SCAS unit ran with sludge retention times > 12 days. A maximum EDTA removal rate of 0.2 kg/m3/day was achieved. In order to confirm the biodegradation of EDTA, closed bottle tests were carried out with sludge originating from the SCAS unit. The tests were conducted at a pH range from 8.0 to 8.5. The lag period was only few days. The time to reach a BOD/ThOD ratio of 0.6 was 3 weeks after initiation of detectable biodegradation. EDTA was not biodegraded at pH 7.0. The removal of EDTA was investigated in a full-scale activated sludge plant operated at pH values between 7.5 and 8.5 with dairy wastewater containing ca. 30 mg/l EDTA. The dairy wastewater was treated at a hydraulic residence time of one day and a sludge retention time of 20 days. The analysis of influent, effluent and sludge concentration resulted in approximately 90 % removal. At a pH of 6.7 no biodegradation took place.
Key value for chemical safety assessment
- Biodegradation in water:
- inherently biodegradable
Additional information
Based on read-across from the disodium salt of EDTA, K3HEDTA is consdisered to be inherently biodegeradable. Sodium and potassium are both members of the 1a group of metals in the periodic table. Due to their low electronegativity they form ionic bonds and highly water soluble salts with inorganic and organic acids. The solution of these salts is therefore dominated by the property of the acid anion. This justifies reading across biodegradation from the sodium to the potassium salt and additional justification for basing the expected degradation on the EDTA anion.
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.
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