Registration Dossier
Registration Dossier
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EC number: 236-715-1 | CAS number: 13466-20-1
Endpoint summary
Administrative data
Description of key information
Additional information
Barium bis(dihydrogen orthophosphate) is an inorganic phosphate salt. The substance is well soluble in water (WS: 27.79 ± 0.63 g/L at 20 °C and pH 2.9 - 3.0). When released to water and in biological systems the substance dissociates basically to phosphate species and barium ion. Barium and phosphorus are generally abundant natural elements that are ubiquitous in the aqueous and terrestrial environment. Barium is found in nature as a component of minerals and may enter the environment through weathering of rocks and minerals (ATSDR, 2007). Under natural conditions barium has oxidation state of +2 and has the character of heavier alkali earth elements, e.g. Ca. Phosphorus retention in soils is influenced by the form of P released. Triphosphate is a condensed phosphorus species with three phosphate units. 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.
Distribution of barium bis(dihydrogen orthophosphate) to air is not likely. The substance is an inorganic solid and can thus be considered non-volatile. Due to the low vapour pressure is a significant release to the atmosphere not anticipated.
The potential of barium bis(dihydrogen orthophosphate) for bioaccumulation and secondary poisoning is low. A study investigating the accumulation of trace elements in bluegill tissue determined a BCF for barium salt of 74.4 μg/g wet weight of bluegill tissue (Lepomis macrochirus, male carcass). An accumulation of phosphate in organisms is unlikely to pose a hazard potential, as the phosphate anion is an essential micronutrient for many organisms and the internal concentration is regulated biologically.
Reference
ATSDR, Agency for Toxic Substances and Disease Registry, 2007, Toxicological profile for Barium and Barium compounds. U.S.Department of Health and Human Services.
Busman, Lowell Marion (1984), "Behavior of polyphosphates in soils ". Retrospective Theses and Dissertations. Paper 8979.
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