E.system preparation
using apparatus assembled as shown in figure 990.28A , position flask(c) in heating mantle controlled by power-regulating device(theostat),and add 400 ml H2O to flask. close stopcock of separatory funnel (B) and add 90 ml 4M HCL to separatory funnel. begin N2 flow at 200+-10 ml/min. initiate condenser coolant flow at this time. to vessel (G) add 30 ml 30% H2O2 which has been titrated to yellow end point with 0.01M NaOH. after 15 min, apparatus and water will be thoroughly deoxygenated and prepared test suspension may be introducced into system.