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EC number: 232-088-3
CAS number: 7785-84-4
trimetaphosphate is an inorganic phosphate and therefore a ready
biodegradation test is not applicable.
study (Walker J, 2010) exists for the endpoint 'hydrolysis as a function
of pH'. The study, conducted in fresh water, shows that trisodium
trimetaphosphate was hydrolytically stable over the course of the study.
However this data should be viewed in parallel with the supporting data
provided as this information gives a more accurate picture of the
behaviour and stability of the substance in natural waters and therefore
is more relevant for the purposes of exposure estimations and risk
assessment. Trisodium trimetaphosphate will not persist in natural
waters as the trimetaphosphate will undergo undergoes hydrolysis (this
occurs at a rate much slower than that of only condensed phosphates) and
biotic degradation and assimilation by algae and/or micro-organisms.
ultimate degradation of trimetaphosphate is orthophosphate.
sediment degradation studies are not considered to be scientifically
feasible as there is no available analytical method that could
differentiate between the contributions to the analysable solution
the test material and that originating from the required soil / sediment
matrix / solution matrix due to the ubiquitous nature of the Na+ and
volatilisation is not available. Trisodium trimetaphosphate is an
inorganic solid and therefore can be considered to be non-volatile.
experimental data on bioaccumulation exist. However due to the
hydrophilic nature of the substance, bioaccumulation is not expected as
accumulation in fats is not possible. The substance when dissolved in
water (and so animal tissues/fluids) will effectively separate
into/become simply the two ions "phosphate" and "sodium" which are
natural ionic components of blood, cell fluids, etc and therefore no
further testing is considered to be necessary. In addition, no risk of
secondary poisoning is anticipated for the same reasons.
trimetaphosphate is hydrolysed or biotically degraded (by the action of
phosphatases) to soluble inorganic orthophosphate (PO43-)
in wastewater, sewerage systems and natural waters. Sources of inorganic
phosphate are human urine and faeces, animal waste, food and organic
waste, mineral fertilisers, bacterial recycling of organic materials in
ecosystems, etc. Soluble phosphates are then bio-assimilated by the
bacterial populations and the aquatic plants and algae found in these
different compartments. Phosphates are an essential nutrient (food
element) for plants, and stimulate the growth of water plants
(macrophytes) and/or algae (phytoplankton) if they represent the
enrichment caused by excess of phosphate (when the conditions are such
that P is a growth-limiting factor) can be a problem in some
circumstances. The effects of eutrophication can range from ecosystem
modifications, through to algal blooms and in extreme cases (through
decomposition of plant biomass) oxygen depletion and collapse of the
ecological community in a surface water causing considerable detrimental
impacts on fish and other organisms as the increase in primary
production leads to increased oxygen consumption, which may reduce the
oxygen concentration to critical low levels.
such undesirable effects, phosphate emissions to surface water via
industrial wastewater are regulated in the Council Directive 96/61/EC
concerning integrated pollution prevention and control. It states that
phosphates have to be taken into account for fixing emission limit
values for industrial wastewater. In order to meet the requirements it
may be necessary to add a treatment step for phosphate removal from
industrial wastewaters before these waters are released to the aqueous
environment. This method for limiting the concentration of phosphates in
industrial wastewater emissions is supported by the
Waste Water Treatment Directive 1991/271 (EU) which requires the removal
of phosphate (P) from municipal waste water in all but very small
conurbations (> 10 000 person equivalents = around 6 000 population
taking into account small industry and commerce inputs), wherever
discharge occurs into waters potentially susceptible to eutrophication.
The EU Water Framework Directive 2000/60 confirms this obligation, and
reinforces it by requiring further treatment, e.g. of small
conurbations, if this is necessary to achieve water quality status
Madariaga BM (2007) developed a conceptual model and protocol for
performing European quantitative eutrophication risk assessments of
(poly)phosphates in detergents. In this model, the risk probability for
eutrophication occurring in the most sensitive areas of a river basin
(lakes, reservoirs, meadow zones, estuaries), is based on the TP (total
phosphorous) concentration of the inflow water. The variability observed
for similar TP concentrations is the consequence of variations in
concentrations of N and/or other nutrients, other ecosystem factors and
other natural variability. The study also covered the implementation of
the model and a set of examples based on generic European scenarios as
well as a pan European probabilistic estimation covering the diversity
observed for the European conditions and enabled a probabilistic risk
assessment of eutrophication relating to the use of sodium
tripolyphosphate (pentasodium triphosphate) in detergents. The
scientific validity of this methodology was confirmed by the EU
scientific committee SCHER (Opinion of 29th November 2007).
of PBT/vPvB properties; comparison with the criteria of Annex XIII
(Regulation (EC) No. 1907/2006.
to the Guidance on Information Requirements and Chemical Safety
Assessment, Chapter R.11: PBT Assessment, the PBT and vPvB criteria of
Annex XIII to the regulation do not apply to inorganic substances.
Therefore trisodium trimetaphosphate is not considered to require any
further assessment of PBT properties.
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.Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
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