DETERMINATION OF CHROMIUM(III) AND TOTAL CHROMIUM IN MARINE WATERS

The development of an analytical technique is described which may be u sed to determine chromium, chromium(III) and chromium(VI) in estuarine and coastal waters. The method is based on selective micro-solvent ex traction with subsequent GFAAS. Tile technique has been applied in a m ajor North Sea estuary. The results obtained confirm that thermodynami c factors alone cannot be relied upon to describe the form of chromium in estuaries. Kinetic factors appear to have a strong influence over speciation and lead to the persistence of Cr(III) species in environme nts where Cr(VI) would be expected to be present.