Add approx. 100mL of reagent grade water to flask, then add R3 (Sulphuric • acid), R2 (Caustic/Iodide), R1 (Manganous salt) and then 10mL of bi-iodate from manual Dosimat. Mix well between additions. Next add the spin bar. • Place the flask in the water bath in unit and ensure flask is seated flush to • bottom and held in place by clamp. Put thiosulphate diffuser tip into flask not in light path – Titrate by pressing <Enter> • The p.c.display shows the endpoint and slopes when the titration is • complete. Press any key Display now shows standards menu and is ready for next titration • Repeat titrations to 0.0003 (SCRIPPS use 0.0006) • When standards are finished, select and edit bad points as • “review results” necessary When editing is finished select OK and press <Enter>. • You can only edit 1 value at a time • Display is now on the standards menu • Select exit and press <Enter> • Display is now on main menu again • Run Blanks as follows: Select from main menu. Display now shows • “Blanks” “Blanks menu” Select and press <Enter>. Thiosulphate temperature is • “Titrate blanks” displayed. If OK then press <Enter> and the will be displayed “ready” screen Prepare blanks of reagent grade water ( approx. 100mL.) • Add 1 mL each of R3, R2, R1, mixing well between adds. • Then add 1mL of bi-iodate from the manual Dosimat • Press <Enter> and titration starts. • When endpoint and slopes are plotted, add a further 1mL of bi-iodate without • removing flask from chamber.
• Add approx. 100mL of reagent grade water to flask, then add R3 (Sulphuric acid), R2 (Caustic/Iodide), R1 (Manganous salt) and then 10mL of bi-iodate from manual Dosimat. Mix well between additions. • Next add the spin bar. • Place the flask in the water bath in unit and ensure flask is seated flush to bottom and held in place by clamp. Put thiosulphate diffuser tip into flask – not in light path • Titrate by pressing <Enter> • The p.c.display shows the endpoint and slopes when the titration is complete. Press any key • Display now shows standards menu and is ready for next titration • Repeat titrations to 0.0003 (SCRIPPS use 0.0006) • When standards are finished, select “review results” and edit bad points as necessary • When editing is finished select OK and press <Enter>. • You can only edit 1 value at a time • Display is now on the standards menu • Select exit and press <Enter> • Display is now on main menu again Run Blanks as follows: • Select “Blanks” from main menu. Display now shows “Blanks menu” • Select “Titrate blanks” and press <Enter>. Thiosulphate temperature is displayed. If OK then press <Enter> and the “ready” screen will be displayed • Prepare blanks of reagent grade water ( approx. 100mL.) • Add 1 mL each of R3, R2, R1, mixing well between adds. • Then add 1mL of bi-iodate from the manual Dosimat • Press <Enter> and titration starts. • When endpoint and slopes are plotted, add a further 1mL of bi-iodate without removing flask from chamber.