Boron Use and Control in PWRs and FHRs

Boron sees extensive use as a neutron absorber for use in nuclear reactor systems. Pressurized water reactors (PWRs) utilize boron in their control rods as solid absorbers and coolants as chemical shims. Boron is also being considered as the main component in the neutron shielding system for Fluoride-Salt Cooled High Temperature Reactors

Solvation - Wikipedia

Solvation (or dissolution) describes the interaction of solvent with dissolved molecules. Both ionized and uncharged molecules interact strongly with solvent, and the strength and nature of this interaction influence many properties of the solute, including solubility, reactivity, and color, as well as influencing the properties of the solvent such as the viscosity and density.

Isotopic composition of dissolved boron and its ...

The isotopic composition of dissolved boron, in combination with the elemental concentrations of B, Cl and salinities in freshwater-seawater mixed samples taken from the estuary of the Changjiang River, the largest one in China, was investigated in detail in this study. Brackish water and seawater samples from the estuary of the Changjiang River were collected during low water season in ...

Source and evolution of dissolved boron in rivers ...

Mar 01, 2019· The evolution of atmospheric CO 2 and the pH of the ocean can be reconstructed by the boron isotopic composition (δ 11 B) of marine carbonates, which is influenced by the δ 11 B of the seawater. Boron (B) in the ocean is primarily affected by continental weathering through rivers. Thus, it is essential to understand the behavior of B and B isotopes in rivers and the factors affecting ...

Effect of Dopant Compensation on the Behavior of Dissolved ...

Effect of Dopant Compensation on the Behavior of Dissolved Iron and Iron-Boron Related Complexes in Silicon XiaodongZhu,1 XuegongYu,1 PengChen,1 YongLiu,1 ... The behavior of iron, iron-boron (FeB) pairs, and iron-boron-phosphorus (FeB-P) complexes has been studied in B-doped

Behavior of Boron Isotopes During Chemical Weathering: a ...

The high sensitivity of boron isotopes fractionation to water rock interactions make it a valuable tool to constrain chemical weathering processes. To have a global picture of the behavior of boron isotopes during chemical weathering of rocks at the surface of the continents, we analyzed the largest rivers for both the dissolved and suspended load.

Dissolved Boron in the Tapi, Narmada and the Mandovi ...

Nov 19, 2013· The concentrations of dissolved boron have been measured during different seasons in three estuaries, the Tapi, Narmada and the Mandovi situated on the western coast of India, to investigate its geochemical behavior and inputs from the localized anthropogenic pressures of industrial effluents and sewage discharge. The measured boron concentrations in these estuaries (except the Tapi …

Effect of dopant compensation on the behavior of dissolved ...

The behavior of iron, iron-boron (FeB) pairs, and iron-boron-phosphorus (FeB-P) complexes has been studied in B-doped Czochralski silicon with phosphorus (P) compensation and compared with that in uncompensated material. The interstitial iron concentration has been measured at temperatures from 50 to 270 degrees C. The apparent binding energy (E-b) of FeB in compensated silicon is (0.25 +/- 0 ...

(PDF) Modeling of the hot deformation behavior of boron ...

The present results suggest that the precipitation of boron during the deformation process should occur rapidly and only the boron atoms remaining interstitially dissolved in the matrix affect the austeniteferrite transformation. Supersaturated boron would precipitate as iron-boride, Fe 2 B and/or iron-borocarbide, Fe 23 (B, C) 6, during cooling.

Distribution and behaviour of boron and fluoride in ...

As regards to conservative behaviour of boron in seawater, the ration remains absouletly constant throughout ocean. The change in the ratio occurs moatly at nearshore regions under the influence of freshwater (Shirodkar and Singbal, 1992).

Dissolution Behavior of Lead Borate Glass under Simulated ...

Boron dissolved with the highest rate in all types of the solutions and was regarded as an index element to represent the glass dissolution rate. On the other hand, lead dissolved with a far slower rate. The chemical species and possible precipitating minerals of lead were examined by a geochemical calculation code for typical underground water.

boron | Properties, Uses, & Facts | Britannica

Feb 21, 2021· Crystalline boron is almost inert chemically at ordinary temperatures. Boiling hydrochloric acid does not affect it, and hot concentrated nitric acid only slowly converts finely powdered boron to boric acid (H 3 BO 3).Boron in its chemical behaviour is nonmetallic. In nature, boron consists of a mixture of two stable isotopes— boron-10 (19.9 percent) and boron-11 (80.1 percent); slight ...

Boron in Drinking-water - World Health Organization

Elemental boron exists as a solid at room temperature, either as black monoclinic crystals or as a yellow or brown amorphous powder when impure. The amorphous and crystalline forms of boron have specific gravities of 2.37 and 2.34, respectively. Boron is a relatively inert metalloid except when in contact with strong oxidizing agents.

GROUND-WATER POLLUTION DETERMINED BY XA9848325 …

sources of dissolved material and water flow in aquifer systems. ... partitioned into B(OH)3) (the dominant dissolved boron species at normal pH), while ^B is preferentially incorporated into the B(OH)4" which enters the solid phase. ... The behavior of boron isotopes in the unsaturated zone has been evaluated only partially. Vengosh et al. [18 ...

Boric acid - Wikipedia

Boric acid, also called hydrogen borate, boracic acid, and orthoboric acid is a weak, monobasic Lewis acid of boron.However, some of its behaviour towards some chemical reactions suggest it to be tribasic acid in the Brønsted sense as well. Boric acid is often used as an antiseptic, insecticide, flame retardant, neutron absorber, or precursor to other chemical compounds.

Dissolution Behavior of Boron Nitride Inclusions and ...

The dissolution behavior of boron is promoted by raising the temperature to 1150 C. When the temperature reaches 1200 C, boron is distributed in the matrix, and BNcan no longer beobserved.As the solid solutionof boron doesnotresegregateat730 C,theuniformsolidsolutionstateof boron in CB2 steel is not affected by the tempering process.

Chapter 3 (Boron) of Regulatory Determinations Support ...

Boron, an inorganic compound (IOC), is a non-volatile metalloid that is ubiquitous in the environment in compounds called borates. Common borates include boron oxide, boric acid, ... 3.1.2 Environmental Fate and Behavior . Little is known about the residence time of boron compounds in air, soil, or water.

Removal of dissolved boron and silicon during estuarine ...

Jun 01, 1973· The behaviour of dissolved boron and silicon during mixing of sea and river waters has been studied in two surveys of the estuary of the River Alde in Suffolk, England. Removal of approximately 25-30 per cent was found for both elements. This appears to be the first report of estuarine removal of dissolved boron. The extent of removal of silicon in the Alde is somewhat higher than that …

Source and evolution of dissolved boron in rivers ...

The evolution of atmospheric CO 2 and the pH of the ocean can be reconstructed by the boron isotopic composition (δ 11 B) of marine carbonates, which is influenced by the δ 11 B of the seawater. Boron (B) in the ocean is primarily affected by continental weathering through rivers. Thus, it is essential to understand the behavior of B and B isotopes in rivers and the factors affecting ...

Dissolved Boron in the Tapi, Narmada and the Mandovi ...

hibits a conservative behavior during the seasons sampled sug-gestive of no measurable addition or removal of boron in the estuarine region. The orders of magnitude differences in boron concentration between the river waters and seawater, and the conservative behavior of dissolved boron indicate that its …

Behavior of Boron in Molten Aluminum and its Grain ...

boron is dissolved in pure aluminum while its dissolution is inhibited in presence of titanium solute. A thin layer of TiB 2 formed at the surface of boron thickens with residence time in the melt. The mechanisms by which aluminum is crystallized on boron are discussed. DOI: 10.1007/s11661-012-1388-x

Isotopic composition of dissolved boron and its ...

May 01, 2007· The isotopic composition of dissolved boron, in combination with the elemental concentrations of B, Cl and salinities in freshwater-seawater mixed samples taken from the estuary of the Changjiang River, the largest one in China, was investigated in detail in this study. Brackish water and seawater samples from the estuary of the Changjiang River were collected during low water season in ...

Dissolved boron in a brackish-water lagoon system (Chilika ...

Boron is a bio-essential metalloid and its concentrations as well as isotopic compositions are useful tracers for various environmental processes; however, its oceanic budget is not yet well-constrained. In this contribution, spatial and seasonal distribution of dissolved boron of the Chilika lagoon, India (Asia's largest brackish-water lagoon) and its possible source waters have been ...

Removal of dissolved boron and silicon during estuarine ...

Jun 01, 1973· The behaviour of dissolved boron and silicon during mixing of sea and river waters has been studied in two surveys of the estuary of the River Alde in Suffolk, England. Removal of approximately 25–30 per cent was found for both elements. This appears to be the first report of estuarine removal of dissolved boron.


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