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Diss Factsheets
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EC number: 932-833-9 | 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
Adsorption / desorption
Administrative data
Link to relevant study record(s)
Description of key information
Key value for chemical safety assessment
Additional information
Iron (III)
Adsorption/desorption as a partitioning process associated with organic carbon is not a relevant endpoint for iron. Environmental fate is dominated by abiotic and physico-chemical processes, including precipitation and settling. Sufficient information for the assessment of the environmental fate of iron is available in the public domain and is discussed in Section 4.2.4.
Citrate
Based on the low log Kow of citric acid, it is not expected to absorb strongly to the organic matter in soil. However, it’s ionic nature and its ability to complex metal ions means that it could absorb strongly via other mechanisms.
A study is not required according to column 2 of REACH Annex VIII because citrate is readily biodegradable and decomposes rapidly in the environment.
Citrates form stable complexes with metal ions due to its multiple-binding capacities; pH will affect the number of binding sites by altering the ionisation state of the substance.
Citrate may form specific complexes with mineral surface functional groups, affecting surface charge characteristics, enhancing metal cation adsorption, competing with other specifically retained substances for surface sites and inhibiting mineral crystallisation and affecting mineral precipitation and dissolution directly. In soils can reside almost completely in the adsorbed phase (Essington 2008).
The log Kocvalue of citric acid may be read across from EDTA on the principle that they are both complexing agents. EDTA is a stronger complexing agent than citric acid and so the read-across represents a worst case scenario.
The Kocvalue of citric acid was determined from the Kp-susp of Ethylene Diamine Tetra Acetic Acid (EDTA) by the following equations
Kpsusp = 75
Kpsusp = Foc * Koc= 0.05 *Koc
75 = 0.05 *Koc => Koc= 1500
The Kocand Kpsusp values of 1500 and 75 were used for the exposure calculation of citrate respectively.
Where:
Kpsusp = partition coefficient solid-water in suspended matter
Foc = weight fraction of organic carbon in water compartment
0.05 = weight fraction organic carbon sediment solids
Ammonium
Adsorption/desorption as a partitioning process associated with organic carbon is not a relevant endpoint for this inorganic ion.
Ammonium will enter the nitrogen cycle in soil, where it is an important intermediate in the assimilation of nitrogen from the soil by plants.
Ammonium is bound in soil by the attraction of the positive charge on the ammonium ion to the negatively charged soil micelles. In soil, ammonium is adsorbed primarily by four mechanisms: chemical (exchangeable), fixation (non-exchangeable), reaction with organic matter and physical attractive forces (Environment Canada 2001). It is poorly mobile in soil (OECD 2004).
Sulfate
Adsorption/desorption as a partitioning process associated with organic carbon is not a relevant endpoint for this inorganic ion.
Sulfate is ubiquitous in the environment and is not of concern.
The ability of soils to retain sulfate by adsorption or mineral formation is well recognised. The mechanisms are chemically complex and may be non-specific ion-ion interactions or "irreversible" interactions which can involve the accompanying cations and bridging due to SO42-being divalent. Mineral formation may also play some role in sulfate retention in soils, particularly if pH is low and aluminium levels high (Chesworth 2008).
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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