12 16 20 24 28 32 36 40 44 48 50 



2 6 10 14 18 



B 22 26 30 34 38 42 46 50 



Figure 3. Processes of nitrification in solutions of pyror-70. 

 open aquariums with air blown in. K— control . 



Tests in 



BOD 

 NO 2 

 N0 3 



Key: 



1—100 mg/1; 2—10 mg/1 ; 3—1 mg/1 ; 

 1—10 mg/1; 2—100 mg/1; 3—1 mg/1; 

 1—10 mg/1; 1 — 1 mg/1; 3—100 mg/1. 



Along the axis of the abscissa— days of the test, 

 a. BOD. 



