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EC number: 231-203-4 | CAS number: 7446-26-6
- 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)
- Endpoint:
- adsorption / desorption: screening
- Data waiving:
- other justification
- Justification for data waiving:
- other:
Reference
Description of key information
Key value for chemical safety assessment
- Koc at 20 °C:
- 1 100 000
Other adsorption coefficients
- Type:
- log Kp (solids-water in suspended matter)
- Value in L/kg:
- 5
Other adsorption coefficients
- Type:
- log Kp (solids-water in soil)
- Value in L/kg:
- 2.2
Additional information
The mobility of zinc in soil depends on soil properties like organic matter content, clay content, hydroxides and also factors like on soil pH and redox potential. The soil pH is an important factor influencing the adsorption and thus the mobility of zinc. The amount of zinc in solution increases with decreasing pH (WHO 2001). Data on the adsorption behaviour of zinc has been comprehensively reviewed EU Risk Assessment Report for zinc metal (ECB, 2008). In the report Kp values of 110,000 (logKpsusp=5.04) and 73,000 (logKpsed=4.86) L/kg were identified for zinc. The Kp values were adopted for the risk assessment for dizinc pyrophosphate.
Phosphate adsorption is affected by numerous factors, e.g. pH, type and concentration of electrolytes, clay content, Al and Fe oxides, and organic matter content (Razaq, 1989). At normal soil pH values of 4.5 - 6.2 the dominant species are H2PO4 - and HPO4 -2. These ions can be present in soil water and also absorb onto the surface (or adsorb into) solid matter in soil. Two types of inorganic reactions control the concentration of phosphate ions in solution; these are precipitation-dissolution and sorption-desorption processes. Precipitation-dissolution reactions involve the formation and dissolving of precipitates, which is significantly pH depended. Sorption-desorption reactions involve sorption and desorption of ions and molecules from the surfaces of mineral particles, such as Al/Fe oxides/hydroxides, clay minerals and carbonates (Parker et al., 1998). Sato et al. (2009) observed that phosphorus released from calciumphosphate was adsorbed to aluminium and iron-oxyhydroxides. Basically, phosphate adsorption dominates in mineral soil with a low pH.
Reference
European Chemicals Bureau (ECB), Risk assessment Zinc metal CAS-No.: 7440-66-6, EINECS-No.: 231-175-3, Final report, May 2008, EUR 24587 EN – 2010
Parker J.E., Robertson J., Wansbrough H. (1998) Chemical Processes in New Zealand, Bd 2. New Zealand Institute of Chemistry, 01.01.1998.
Razaq, Ibrahim Bakry Abdul (1989) Effect of pH and exchangeable metals on phosphate adsorption by soils. Retrospective Theses and Dissertations, Paper 9170.
Sato et al. (2009) Biogenic calcium phosphate transformation in soils over millennial time scales. Journal of Soils Sediments (2009) 9:194–205
WHO. 2001. Environmental Health Criteria Series 221: Zinc, International Programme on Chemical Safety, World Health Organization, Geneva
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