Table 1

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Table 1

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.