Table 1.

Effects of different concentrations of heavy metals and pentachlorophenol (Pent.) on the photosynthetic efficiency (slope coefficients) of C. reinhardtii after 24 h exposure.

Concentration,	Substances
mg l-1	Copper	Nickel	Lead	Zinc	Pent.
0.0	0.140	0.140	0.140	0.140	0.140
0.1	0.131	0.232	0.150	0.224	0.098
0.5	0.055	0.228	0.133	0.153	0.090
1.0	0.015	0.251	0.138	0.180	0.002
1.5	0.026	0.267	0.176	0.174
2.0	0.047	0.244	0.160	0.165
5.0					0.014
10.0					0.014
R	- 0.66	0.64	0.60	- 0.54	- 0.83

R - coefficient of correlation between increasing concentrations of the substances tested and the photosynthetic efficiency.