Hydrogen uranyl phosphate

A rather more specific mechanism of microbial immobilization of metal ions is represented by the accumulation of uranium as an extracellular precipitate of hydrogen uranyl phosphate by a Citrobacter species (83). Staggering amounts of uranium can be precipitated more than 900% of the bacterial dry weight Recent work has shown that even elements that do not readily form insoluble phosphates, such as nickel and neptunium, may be incorporated into the uranyl phosphate crystallites (84). The precipitation is driven by the production of phosphate ions at the cell surface by an external phosphatase. 

See also Hydrotrioxides Hydrogen uranyl phosphates, 25 433-434 Hydrogeochemical cycle(s), 26 4-12. 

ADP = Ammonium Dihydrogen phosphate, NH4H2PO4 AlPO = A framework aluminophosphate HUP = Hydrogen uranyl phosphate KDP = Potassium Dihydrogen phosphate, KH2PO4 KTP = Potassium Titanyl Phosphate, KTi0P04 NASICON = Sodium Superionic Conductor. 

Hydrogen uranyl phosphate (HU02P04-4H20) intercalates (dimethylaminomethyl)ferrocene by direct reaction in methanol or aqueous solutions (Table 9) 307,307a... 

The intercalation of polyaniline into hydrogen uranyl phosphate HUO2PO4.4H2O (HUP) was reported by Liu and Kanatzidis [67]. HUP is a layered material with an interlayerspacing value of 8.69 A. The layers consist of dumb-bell-shaped UO2 ions with uranium further coordinated to four equatorial oxygen atoms of four P04 tetrahedra. The van der... 

Proton-carried migration occurs in oxonium p-alumina and hydrogen uranyl phosphate, HUP. Both are of the mss type and belong to the specific subclass of vehicle mechanisms in which is the mobile... 

Hydrogen uranyl phosphate, H3OUO4PO4.3H2O (HUP), and related materials... 

As listed in Table 36.1, a good deal of research has been carried out so far on proton conductor-based gas sensors workable at ambient temperature. Various inorganic and organic ion exchangers, such as hydrogen uranyl phosphate (HUP), zirconium phosphate (ZrP), antimonic acid (AA), and NAFION membrane, have been utilized in the form of a disc, thick- or thin-film. The ionic conductivities of these proton conductors, in the range lO " 10 S cm are modest but seem to be still sufficient for chemical sensing devices. 

Examples of phosphate stractures containing hydroxonium H3O+ cations are provided by hypo-phosphoric acid dihydrate, tetrametaphosphimic acid (13.23) and hydrogen uranyl phosphate tetra-hydrate, all of which possess complex systems of H bonds in the solid state [28-30]. 

Metal hydrogen phosphates Hydrogen uranyl phosphate Metal phosphates Smectite clays and silicates... 

Morosin B. Hydrogen uranyl phosphate tetrahydrate, a hydrogen ion solid electrolyte. Acta crystallogr., B34, 1978, 3732-4. 

Childs, P. E., Howe, A. T. Shilton, M. G. (1978). Battery and other applications of a new proton conductor hydrogen uranyl phosphate tetrahydrate, HUO2PO4.4H2O. /. Power Sources, Vol. 3, pp. 105-114... 

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