  The biosorption of Cr(VI) Arthrobacter species (Arthrobacter globiformis 151B
and Arthrobacter oxides 61B) after growth in the presence of Zn (II) ions at
different Na (I) concentrations was studied application using dialysis and
atomic absorption analysis. It was shown that after absorption of Zn(II) during
growth of types of Arthrobacter the biosorption of Cr (VI) with types
Arthrobacter (Arthrobacter globiformis 151B, Arthrobacter oxidas 61B) increases
at various concentration of Na (I) comparative without Zn(II), at identical
concentration of Na (I). It is seen, that zinc(II) ions promote for Cr(VI) part
of the active centers of Arthrobacter species and Na(I) ions already has
relatively little effect on them. However, this change is more pronounced for
Cr (VI) _Arthrobacter globiformis 151B + Zn (II) than for Cr (VI) _Arthrobacter
oxides of 61B + Zn (II).
