Chlorite
Chlorite
50081_Chlorite.fm Page 133
Safety
Good safety habits and laboratory techniques should be used throughout the procedure.
Consult the Material Safety Data Sheet (MSDS) for information specific to the reagents
used in this procedure.
Summary of Method
This procedure permits the determination of chlorite (ClO
2
-
) in the sample.
This procedure involves two amperometric titrations. These titrations are as follows:
• Titration 1 — Cl
2
(not volatized by a nitrogen gas purge)
• Titration 2 — ClO
2
-
The AutoCAT 9000 stores all titration results and, after completion, calculates the
analyte value.
Required Reagents
Description Qty. required per test Unit Cat. No.
Phenylarsine Oxide (PAO) Titrant, 0.00564 N............................................varies................ 1000 mL ...............1999-53
Hydrochloric Acid Standard Solution, 2.5 N ..............................................4 mL................. 100 mL .................1418-32
Phosphate Buffer, pH 7, with dropper.........................................................1 mL................. 100 mL ...............21553-32
Potassium Iodide, ACS................................................................................1.0 g. ................ 100 g....................167-26H
Required Apparatus
Beaker, Glass, 250-mL ................................................................................1 ....................... each......................500-46H
Gas Washing Bottle (GWB) ........................................................................ 1 ....................... each.....................26622-00
Magnetic Stir Bar, Teflon
®*
coated.............................................................1 ....................... each.....................50085-00
Measuring Spoon, 1.0 g (NaCl weight), molded plastic .............................1 ....................... each.........................510-00
Pipet, Volumetric, Class A, 100-mL............................................................1 ....................... each.....................14515-42
Stand, Support Ring.....................................................................................1 ....................... each.........................563-00
Support Ring, for GWB...............................................................................1 ....................... each.....................26563-00
Optional Reagents
Dilution water, organic-free ........................................................................ varies................ 500 mL ...............26415-49
Optional Apparatus
Mini-printer, thermal, w/cable............................................................................................... each.....................A70P021
Cylinder, Graduated, 250 mL ......................................................................1 ....................... each.........................508-46
*Teflon is a Registered Trademark of EI DuPont Company.
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