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Sodium metatungstate, N~[H,W,,O,,] is presented as a new medium for density-gradient centrifugation. This electrolyte may be used in aqueous, aqueous sodium chloride, or in methanol solutions. The sedimentation behaviour of sodium metatungstate in binary (Na6[H2W,,0+,]/ H20) and in ternary (Na,[H,W,,O,]/NaCI/H,O) systems is presented and discussed. Practical examples are presented from macromolecular chemistry (Sedipur), biochemistry (DNA), and mineralogy (sodium-aluminium mica).

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