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EC number: 237-714-9
CAS number: 13939-25-8
Kdsoil (aluminium): 3700 L/kg
Aluminium dihydrogen triphosphate (CAS 13939-25-8) is an inorganic
phosphate compound. The substance can be transformed by hydrolysis
forming aluminium species and soluble orthophosphate (PO43-) in sewerage
systems, sewage treatment plants and in the environment. The mobility of
aluminium species is very complex and difficult to predict.
The formation of speciation of aluminium and adsorption and desorption
of aluminium on suspended particles can be affected by a number of
geochemical factors. The relative mobility of aluminium species depends
upon on many factors, especially pH, alkalinity, temperature, dissolved
organic carbon, dissolved inorganic carbon and anion concentration. At
low pH, (less than 5.5), aluminium is predominantly present as Al3+
species, which is highly mobile. As pH increases above 5.5,
aluminium-hydroxide complexes and organically complexed aluminium are
formed by hydrolysis and combined with organic matters. Above pH 7,
anionic aluminium hydroxide predominates. Kaplan (2005) published
several Kd values based on measured Al concentration in groundwater and
sediment and suggested Al Kd values for soil, grout, gravel, clay to be
3700 mL/g and 5000 mL/g for concrete, respectively. Furthermore,
colloidal aluminium species play also an important role in the
adsorption of other trace metals and anions in soils and sediments.
Phosphorus retention in soils is influenced by the form of P
released. Triphosphate is a condensed phosphorus species with three
phosphate units. Busman studied the adsorption of polyphosphate by soils
and clay minerals and indicated that affinity of polyphosphate increased
with increasing length of phosphate units, and adsorption of
triphosphate was more strongly adsorbed than orthophosphate, whereas
mobility and solubility of triphosphate increased by hydrolysis in soils
to orthophosphate (Busman 1984).
Kaplan D.I. (2005) Recommended Distribution Coefficients, Kd
Values, for Special Analysis Risk Calculations Related to Waste Disposal
and Tank Closure on the Savannah River Site (U), Westinghouse Savannah
River Company Savannah River Site,
Busman, L.M. (1984) Behavior of polyphosphates in soils .
Retrospective Theses and Dissertations. Paper 8979.
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