Table 3.

Mean values of Cu²⁺-concentrations per treatment group and day after experimental start.

Treatment	Cu2+-concentration in mg l−1
	Day 4	Day 8	Day 16	Day 32
3 × 5-Eurocent	0.38 ± 0.05	0.90 ± 0.12	1.90 ± 0.20	3.75 ± 0.50
2 × 5-Eurocent	0.26 ± 0.03	0.60 ± 0.00	1.15 ± 0.10	2.15 ± 0.44
1 × 5-Eurocent	0.17 ± 0.02	0.34 ± 0.08	0.78 ± 0.21	1.50 ± 0.50
3 × 2-Eurocent	0.29 ± 0.03	0.58 ± 0.05	1.40 ± 0.23	3.00 ± 0.71
2 × 2-Eurocent	0.26 ± 0.05	0.53 ± 0.10	1.35 ± 0.30	2.38 ± 0.25
1 × 2-Eurocent	0.11 ± 0.02	0.22 ± 0.04	0.53 ± 0.10	1.15 ± 0.10
3 × 1-Eurocent	0.28 ± 0.03	0.53 ± 0.05	1.30 ± 0.20	2.63 ± 0.25
2 × 1-Eurocent	0.19 ± 0.02	0.40 ± 0.00	0.95 ± 0.10	2.13 ± 0.25
1 × 1-Eurocent	0.09 ± 0.02	0.20 ± 0.05	0.46 ± 0.16	1.00 ± 0.23

Mean values ± standard deviations are given.