Lithium metaborate

Lithium metaborate (LiBO2) is a chemical compound.

Lithium metaborate[1]
Names
Other names
boric acid, lithium salt
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.033.287
EC Number
  • 236-631-5
Properties
LiBO2
Molar mass 49.751 g/mol
Appearance white hygroscopic monoclinic crystals
Density 2.223 g/cm3
Melting point 849 °C (1,560 °F; 1,122 K)
0.89 g/100 mL (0 °C)
2.57 g/100 mL (20 °C)
11.8 g/100 mL (80 °C)
Solubility soluble in ethanol
Thermochemistry
59.8 J/mol K
51.3 J/mol K
Std enthalpy of
formation (ΔfH⦵298)
 -1022 kJ/mol
Std enthalpy of
combustion (ΔcH⦵298)
 33.9 kJ/mol
Hazards
Safety data sheet External MSDS
NFPA 704 (fire diamond)
Flammability code 0: Will not burn. E.g. waterHealth code 2: Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury. E.g. chloroformReactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no code
0
2
0
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Applications

Lithium metaborate or lithium tetraborate (Li2B4O7), or a mixture of both, can be used in borate fusion sample preparation of various samples for analysis by XRF, AAS, ICP-OES, ICP-AES and ICP-MS.

Lithium metaborate, lithium teraborate and lithium bromide mix fusion flux

Simultaneous determination of parts-per-million level Cr, As, Cd and Pb, and major elements in low level contaminated soils using borate fusion and energy dispersive X-ray fluorescence spectrometry with polarized excitation.[2]

Lithium metaborate dissolves acidic oxides such as SiO2 and Fe2O3, where the stoichiometric ratio of oxygen to cation, y/x in MxOy, is greater than unity. Lithium tetraborate dissolves basic oxides such as CaO, MgO and other oxides of the alkali metals and alkaline earth metals, where y/x ≤ 1. Most oxides are best dissolved in a mixture of the two lithium borate salts, for spectrochemical analysis.[3]

References
  1. Lide, David R. (1998), Handbook of Chemistry and Physics (87 ed.), Boca Raton, Florida: CRC Press, pp. 4–66, ISBN 0-8493-0594-2
  3. Fernand Claisse, "Fusion and fluxes," Comprehensive Analytical Chemistry: Sample Preparation for Trace Element Analysis, Vol. 41, Elsevier, 2003, p 301-311.


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