20 25 



15 20 



9 



7 

 5 

 3 



10 



20 



Figure 1. Processes of mineralization in solutions with tri ethyl stan- 

 nic chloride. K— control ; 1—0.1 mg/1 ; 2—1 mg/1 ; 3—10 mg/1; 

 4—50 mg/1. Along the abscissa— days of the experiment. 



Key: a. Triethyl stannic chloride. 



b. BPK [biokhimicheskoye potrebleniye kisloroda, BOD biochemical 

 oxygen demand]. 



