The physical and chemical properties of elemental thorium and a few representative water soluble and insoluble thorium compounds are presented in Table 3-2. Water soluble thorium compounds include the ... of the family. The salts of the alkali metals —nitrates, chlorides, sulphides, sulphates, phosphates, carbonates, etc.—are nearly all ...

Environmental pollution stemming from the industrial discharge and/or storage of water-soluble thorium compounds is avoided by converting same into essentially innocuous water-insoluble thorium phosphates, notably orthorhombic thorium phosphates, by (i) reacting such water-soluble thorium compounds, e.g., the nitrates and/or chlorides, with …

Thorium occurs as a trace element in common rocks and rock-forming minerals, with concentrations in the range of a few pp b to a few tens of ppm ().Th 4+ has an ionic radius of ∼ 1 Å (similar to that of U 4+).This high charge and radius precludes the substitution of major ions in minerals by Th 4+.As a result, Th 4+ (and U 4+) is not accommodated in …

Instead, a mixture of insoluble thorium and rare earth polyphosphates were detected after baking at temperatures of 400 and 500 °C. This was attributed to the reaction of the dehydration products of phosphoric acid with rare earth and thorium sulfates. ... precipitation of the moderately soluble rare earth and thorium phosphates. The use of …

By incorporating organic monomers like acrylamide, n-butyl acetate, cellulose acetate, etc. and polymers such as PAN, PS, etc. into inorganic metal …

A process for producing insoluble thorium phosphates from thorium oxalate comprising the steps of (i) repulping the thorium oxalate precipitate in water and reacting the slurry at about 60-70°C with an alkali phosphate compound to precipitate as thorium phosphate and sodium oxalate (ii) separating such thorium phosphate precipitate by filtration (iii) …

Therefore, in this study, we analyzed the effect of thorium on Arabidopsis plants by RNA-seq profiling. Since Th and phosphorus form insoluble phosphates, we focused on the effect of Th in the presence/absence of phosphate in wild-type and mutants with altered phosphate management.

INSOLUBLE salts of polybasic metal ions, such as zirconium, titanium and thorium phosphates, or zirconium arsenate, tungstate and molybdate, are generally obtained as amorphous or semicrystalline materials, which undergo extensive hydrolysis even in weakly alkaline or neutral solutions31~ By refluxing amorphous zirconium phos- phate with ...

Water-insoluble thorium compounds include the dioxide, dicarbonate, hydroxide, oxalate, and phosphate salts. Thorium dicarbonate is soluble in concentrated sodium carbonate (Weast 1983). Thorium metal and several of its compounds are commercially available.

Thorium is present in seawater at only approximately 0.050 wppb, due primarily to the insoluble nature of its only oxide, ThO 2. Thus, the recovery of thorium from seawater is not a realistic option. Because 232 Th is the only isotope of natural thorium, there are no enrichment plant tails from thorium nuclear fuel.

Thorium is produced commercially from monazite sands. After mining, the monazite sands are concentrated magnetically and then treated with either hot, concentrated sulfuric acid or hot, concentrated sodium hydroxide. The acid treatment dissolves the thorium phosphate present, while the basic process converts the phosphates to insoluble hydroxides.

A process for the treatment of soluble thorium compounds, such as in particular nitrates and / or chlorides, comprising firstly reacting said soluble compounds in an aqueous medium with a base, such as ammonia, so as to precipitate thorium hydroxide, then reacting, still in an aqueous medium, said precipitate with a phosphating agent, such as …

Some investigation on the preparative procedure of fibrous thorium phosphate are reported. This new inorganic ion exchanger has been characterized on the basis of chemical analysis, thermal stablity and ion-exchange with alkali metal ions The ion-exchange capacity for Na + iis 3.7 mequiv./g.. Fibrous thorium phosphate has been …

Patent US5403565A - Thorium phosphates prepared by insolubilization of soluble thorium compounds (US 5,403,565 A); Owner: Rhone-Poulenc Chimie; Filed: 10/19/1993; Est. priority date: 10/19/1992; Status: Expired due to Fees; Abstract: Environmental pollution stemming from the industrial discharge and/or storage of water-soluble thorium …

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Potassium thorium triphosphate has been prepared by thermal synthesis at 900°C. The crystal structure has been determined from three-dimensional X-ray film data (638 independent reflexions). The crystals are monoclinic (pseudoorthorhombic) with a = 8.234 (2), b = 10.187 (5), c = 10.015 (2) Å, β = 90°, but the structure was solved and ...

3.2.5 Ammonium Acid Phosphates. Of all the ammonia-based phosphate fertilizer chemicals, monoammonium phosphate (MAP), (NH4 )H 2 PO 4, and diammonium phosphate (DAP), (NH 4) 2 HPO 4, have played a major role in the formation of CBPCs. As discussed in Chapter 2, Sugama and his group [ 7, 8] developed ceramics using these …

Methods are described for the gravimetric determination of thorium in the presence of substantial amounts of phosphate, and of phosphate in the absence of thoria, and for the analysis of insoluble thorium phosphates. Methods are described for the gravimetric determination of thorium in the presence of substantial amounts of phosphate, and of …

Thorium, as well as Ti and Zr, is insensitive to redox change and mainly occurs in its tetravalent form in natural environmental systems (Langmuir and Herman, 1980, Buettner and Valentine, 2012). Most Th-hosting minerals are highly resistant to weathering; hence Th has long been considered a very insoluble and immobile element …

The uptake of naturally occurring uranium, thorium, radium and potassium by wheat plant from two morphologically different soils of India was studied under natural field conditions. ... The other soil factors such as illite clays of alluvial soil which trap potassium in its crystal lattice and phosphates which form insoluble compounds with ...

The effect of anions such as sulfate, chloride, and nitrate on the solubility of rare earth element-bearing phosphates and fluoro-carbonates has been examined using relevant thermodynamic data. The study has found that these anions have significant influences on the overall dissolution of rare earth elements (REEs) from various sources …

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Insoluble residues and precipitates of zirconium and radiation-degraded products of tributyl phosphate (TBP) are key materials in crud formation. Cruds formed by precipitates of zirconium and TBP degradation products, such as di-n-butyl phosphate (HDBP), mono-n-butyl phosphate (H{sub 2}MBP), and phosphoric acid (H{sub 3}PO{sub 4}) are studied.

Phosphates can form insoluble complexes of thorium phosphate with thorium and reduce the intake and translocation of thorium into the above-ground parts of plants. Tobacco ( Soudek et al., 2013 ) and brassica ( Wang et al., 2015 ; Zhou et al., 2016a, b ) grown in the presence of phosphates accumulate approximately 100 times less …

Environmental pollution stemming from the industrial discharge and/or storage of water-soluble thorium compounds is avoided by converting same into essen tially innocuous water-insoluble thorium phosphates, notably orthorhombic thorium phosphates, by (i) react ing such water-soluble thorium compounds, e.g., the nitrates and/or chlorides, with …

Water-insoluble thorium compounds include the dioxide, dicarbonate, hydroxide, oxalate, and phosphate salts. Thorium dicarbonate is soluble …

Thorium phosphates prepared by insolubilization of soluble thorium compounds. Patent. US-5403565-A. Inventor. DELLOYE THIERRY (FR) LE LOARER JEAN-LUC (FR) …

Apatite-group minerals, the dominant repository of phosphate within Earth's crust, are insoluble under most conditions 5, and the presence of Fe 2+, solubilised …

Monazite mostly contains 4 wt.%â€"12 wt.% thorium (Th) and a variable amount of uranium (U), up to 14 wt.%. Xenotime, YPO4, is an yttrium phosphate mineral and frequently its Ce, La, Pr and Nd content is much less than monazite and bast- nasite.

The standard solubility product of TPHPH was evaluated at 298 K by performing dissolution experiments of a synthetic sample in various acidic media at …