Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Biosorption of Cr(III), Cr(VI), Cu(II) ions by intact cells of Spirulina
  platensis   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.

7
The categories of this paper are: hep-th
35
The categories of this paper are: mtrl-th
1
The categories of this paper are: cs
28
The categories of this paper are: alg-geom
29
The categories of this paper are: funct-an
15
The categories of this paper are: nucl-ex
14
The categories of this paper are: math-ph
2
The categories of this paper are: math
13
The categories of this paper are: quant-ph
18
The categories of this paper are: econ
10
The categories of this paper are: q-bio
0
The categories of this paper are: hep-ph
6
The categories of this paper are: astro-ph
24
The categories of this paper are: dg-ga
34
The categories of this paper are: chem-ph
25
The categories of this paper are: patt-sol