Registration Dossier
Registration Dossier
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EC number: 237-997-9 | CAS number: 14154-09-7
Endpoint summary
Administrative data
Description of key information
Additional information
Trimanganese bis(orthophosphate) is an inorganic substance and does not undergo biological degradation.
The availability of manganese in terrestrial as well as aquatic environments is mainly driven by factors like pH and organic matter content. In the aquatic environment manganese exists mainly in the form of manganese(II) oxide and manganese(IV) oxide. The oxidation state depends on pH and the redox potential. At low pH and low redoxpotential the more soluble form Mn (II) dominates. Alkaline conditions can lead to an oxidation to Mn(IV) (WHO, 2004). Manganese salts such as chlorides or nitrates are generally soluble in water with the exception of manganese phosphate and manganese carbonate that are characterised by low solubility. Manganese carbonate is mostly formed at low pH values in the aquatic environment. Aerobic conditions may lead to the formation of manganese oxides that are poorly soluble and precipitate. The ion may also be bound to suspended soil and sediment particles (ATSDR, 2012).
The mobility of manganese in soil depends on the cation exchange capacity. Other factors driving manganese mobility are pH, organic matter, and oxygen content. Manganese is particularly mobile at low soil pH (less than 5.5). The availability decreases with increasing pH values (above 6). Depending on the availability of organic matter, organically complexed manganese can be formed.
Phosphorus retention in soils is influenced by the form of P released. Busman (1984) studied the adsorption of polyphosphate by soils and clay minerals and indicated that affinity of polyphosphate increased with increasing length of phosphate units. Triphosphate was more strongly adsorbed than orthophosphate, whereas mobility and solubility of triphosphate increased by hydrolysis in soils to orthophosphate. 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. 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.
The air compartment is considered not relevant for trimanganese bis(orthophosphate). The substance is not distributed or transported to the atmosphere and is usually not emitted to air.
References:
Busman, Lowell Marion, "Behavior of polyphosphates in soils " (1984). Retrospective Theses and Dissertations. Paper 8979.
WHO (2004). Concise International Chemical Assessment Document 63. Manganese and its compounds: environmental aspects. World Health Organization, Geneva
ATSDR (2012). Toxicological profile for manganese. U.S. Department of Health and Humans Services. Public Health Service. Agency for Toxic Substances and Disease Registry. September 2012
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