  The absorption characteristics of Cr(III), Cr(VI), Cu(II) ions on intact
living cells Spirulina platensis (pH9.6) were studied by using a UV-VIS
spectrophotometer. Also biosorption of these ions with cyanobacteria Spirulina
platensis were studied using equilibrium dialysis and atomic absorption
analysis.It was shown, that the absorption intensity of Spirulina platensis
decreases, when Cr(III), Cr(VI), Cu(II) ions are added. Significant difference
between the absorption intensity for Cu(II) Spirulina platensis and Cr(VI),
Cr(III) Spirulina platensis were observed. Cu(II) was more effectively adsorbed
by cyanobacterium than Cr(VI) and Cr(III). The biosorption constants for Cu(II)
Spirulina platensis is higher than for Cr(VI) and Cr(III) Spirulina platensis
2.69 and 10.15- fold respectively.
