Intracrystalline site preference of hydrogen isotopes in borax
The total hydrogen involved in borax synthesized at 25/sup 0/C in aqueous solution is enriched in deuterium by 5.3% compared with the mother liquor. There is no change in the value of the D/H fractionation factor between the hydrogen in borax and those in the mother liquor with changes in the degree of supersaturation. The fractionation factor changes slightly with a change in the crystallization temperature of borax in the range from 5 to 25/sup 0/C. The D/H ratio in the different sites of borax was estimated by a fractional dehydration technique. The results show that hydrogen atoms of the polyanionic group (B/sub 4/O/sub 5/(OH)/sub 4/) are much more enriched in deuterium than those of the cationic group (Na/sub 2/ x 8H/sub 2/O). The delta D values, referred to the mother liquor from which the borax was crystallized, for the cationic group (site A) and the polyanionic group (site B) are -35 +/- 3 and 167 +/- 13%, respectively based on the fractional dehydration results obtained at -21/sup 0/C. At -21/sup 0/C, isotopic exchange between different sites during dehydration is assumed not to occur. The mechanism for dehydration of borax is discussed. 48 references, 8 figures, 3 tables.
- Research Organization:
- Tokyo Institute of Technology (Japan)
- OSTI ID:
- 5786478
- Journal Information:
- J. Phys. Chem.; (United States), Vol. 89:1
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
DEUTERIUM
ISOTOPIC EXCHANGE
BORAX
CHEMICAL REACTION KINETICS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DEHYDRATION
EXPERIMENTAL DATA
HYDROGEN
INTERSTITIALS
ISOTOPE EFFECTS
ISOTOPE SEPARATION
LOW TEMPERATURE
STRUCTURAL CHEMICAL ANALYSIS
ALKALI METAL COMPOUNDS
BORATES
BORON COMPOUNDS
CRYSTAL DEFECTS
DATA
ELEMENTS
HYDROGEN ISOTOPES
INFORMATION
ISOTOPES
KINETICS
LIGHT NUCLEI
NONMETALS
NUCLEI
NUMERICAL DATA
ODD-ODD NUCLEI
OXYGEN COMPOUNDS
POINT DEFECTS
REACTION KINETICS
SEPARATION PROCESSES
SODIUM COMPOUNDS
STABLE ISOTOPES
400203* - Isotope Exchange & Isotope Separation- (-1987)