Aqueous solutions of the salt sodium polytungstate can be prepared with varying densities up to 3.1 g/cm 3 . The salt is nontoxic and it is recommended as a substitute for the hazardous halogenated hydrocarbons, tetrabromoethane and bromoform, customarily used in geological laboratories to perform light/heavy mineral separations.
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Gregory et al. (1987) studied this question.
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