  The biosorption of Cr(VI)_ and Cr(III)_ of Arthrobacter species (Arthrobacter
globiformis and Arthrobacter oxidas) was studied application dialysis and
atomic absorption analysis at various Na(I) concentrations. Is was shown
significant difference between the binding constants as for Cr(VI)_ and
Cr(III)_Arthrobacter oxidas, as well as Cr(VI)_ and Cr(III)_ Arthrobacter
globiformis at various Na(I) concentrations.
  It was shown, that bioavailability increases in both cases with decreases
Na(I) concentration.
