Table 1.

The average metallothionein level in earthworms treated by cadmium ions

Applied concentration of Cd(NO3)2(μmol.l−1)	Mean concentration of MTa,b(μmol.l−1)	Standard deviationa,b	Concentration of MTa,b Maximum Minimum (μmol.l−1)
0	31.6	10.3	48.5	19.8
5	38.0	15.0	56.1	17.9
10	39.1	13.3	52.6	13.1
20	45.4	15.5	68.2	17.8
30	48.3	16.3	64.7	20.5
40	53.3	25.1	95.6	21.9
50	53.5	26.2	99.9	21.2

^a… number of analyzed samples; n = 5

^b… sample volume (5 μl)