Table 1. One-factor characteristics of dependence of plankton and periphyton ecological state on polluting compounds

Factors

N

N1

N2

min

ETL

max

Exactness %

Completeness %

Biological oxidation

Ammonium

Nitrites

Oil products

Phenols

Detergents

Copper

Water flow

Zinc

Chrome

Pesticides

Temperature

231

231

231

231

231

231

225

231

173

9

110

77

116

116

116

116

116

116

114

116

93

0

64

46

115

115

115

115

115

115

111

115

80

9

46

31

1.030

0.007

0.004

0.015

0.000

0.000

0.001

8.000

0.000

0.005

0.000

8.000

5.3869

0.9861

0.1994

0.6299

0.0093

0.1227

0.0166

177.4800

0.0920

0.0050

0.0860

12.5333

9.000

7.350

0.920

2.020

0.017

0.200

0.070

231.000

0.150

0.016

0.150

18.000

77

75

76

75

75

75

78

80

75

100

100

100

15

37

11

23

10

13

13

7

4

100

2

3

Note to table 1

N = number of observations; N1 = number of normal observations; N2 = number of abnormal observations; Min is the minimum factor value for the period of observation; Max is the maximum factor value for the period of observation; ETL is the ecologially tolerable level of the factor. The Criteria of exactness and completeness are defined in the text. Units: pesticides - mg l-1, temperature - oC, the other factors - mg l-1.