Registration Dossier
Registration Dossier
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EC number: 231-203-4 | CAS number: 7446-26-6
Endpoint summary
Administrative data
Description of key information
Additional information
Dizinc pyrophosphate is a slightly soluble zinc salt (WS: 12.871 mg/L at loading rate of 251 mg test item/L, 20 °C and pH 6.5 -6.7 ). The assessment of the environmental fate and behaviour of Dizinc pyrophosphate is based on a read-across data available for Zn and pyrophosphate compounds respectively. Under environmental conditions a major fraction the target and the source substances will dissolve into the aqueous phase. The dissolved substances will dissociate forming zinc and phosphoric species. If released to the environment, the various zinc and pyrophosphate compounds of the target and the source substance will not differ in the speciation of zinc and phosphorus.
Zinc is an abundant element in the environment and an essential element for organisms. Zinc exists in the environment at different specifications. The speciation and adsorption of metals in the environment depends on a number of parameters, such as pH, redox potential, DOC and the presence of anions or complexing agents. The greater part of zinc in the environment will be complexed with organic acids or adsorbed to organic matter. Under environmental conditions dissolved zinc is present as ZnCO3 of Zn(OH)2 at high pH values. At low pH zinc may stay in solution as free ion. Like zinc, phosphate is ubiquitous in the environment and an essential micronutrient for many organisms. Inorganic phosphates will dissociate to soluble orthophosphate (PO43-) in sewerage systems, sewage treatment plants and in the environment. These same orthophosphates are also formed by natural hydrolysis of human urine and faeces, animal wastes, food and organic wastes, mineral fertilisers, bacterial recycling of organic materials in ecosystems, etc. The phosphate anion in soil will precipitate with Fe, Al or Ca cations. Thus the mobility of phosphate in soil is limited. Phosphates are bio-assimilated by the bacterial populations and the aquatic plants and algae found in these different compartments and are an essential nutrient (food element) for plants, and stimulate the growth of water plants (macrophytes) and/or algae (phytoplankton) if they represent the growth-limiting factor.
Reference
Dizinc pyrophosphate is a solid inorganic salt and thus not volatile. An extensive accumulation in air and the subsequent transport to other environmental compartments not anticipated
WHO. 2001. Environmental Health Criteria Series 221: Zinc, International Programme on Chemical Safety, World Health Organization, Geneva
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