OXIDATION OF THIOSULPHATES S$ 



Exercise 4 



Oxidation of Thiosulphates 



1. Place in four flasks (300-c.c. Erlenmeyer) about 20 

 c.c. each of Nathansohn's solution (m. 60). 



2. Inoculate two flasks with o.i gram of soil each. 

 Leave two flasks uninoculated. 



3. Incubate for four weeks at 28° C. 



4. Remove the flasks from incubator and test for sul- 

 phates. 



