Hach AutoCAT 9000 Instruction Manual page 112

Total Chlorine
Safety
Summary of Method
Required Reagents
Description
Acetate Buffer Solution, pH 4, w/dropper................................................... 1 mL................. 100 mL ...............14909-32
Phenylarsine Oxide (PAO) Titrant, 0.00564 N............................................ varies................ 1000 mL ...............1999-53
Potassium Iodide, SwifTest refill ................................................................ 0.10 g ............... 25 g.......................1077-60
Required Apparatus
Beaker, Glass, 250-mL ................................................................................ 1 ....................... each......................500-46H
Cylinder, Graduated, 250 mL ...................................................................... 1 ....................... each.........................508-46
Magnetic Stir Bar, Teflon
SwifTest dispenser....................................................................................... 1 ....................... each.....................28341-00
Optional Reagents
Chlorine Standard Solution, Voluette Ampules........................................... varies................ 16/pkg.................14268-10
Dilution water, organic-free ........................................................................ varies................ 500 mL ...............26415-49
Potassium Iodide, Powder Pillows .............................................................. 1 ....................... 100/pkg.................1077-99
Sodium Thiosulfate Standard Solution, stabilized, 0.00564 N ................... varies................ 1 L ......................24088-53
Optional Apparatus
Mini-printer, thermal, w/cable............................................................................................... each.....................A70P021
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Page 110
Good safety habits and laboratory techniques should be used throughout the procedure.
Consult the Material Safety Data Sheet (MSDS) for information specific to the reagent(s)
used.
This procedure follows method number 4500-Cl D. in "Standard Methods for the
Examination of Water and Wastewater" (20th Edition). This procedure permits
determination of the total chlorine concentration (
) in a water sample. Total chlorine corresponds to the chlorine derived from
Chlorine Conc.
all its possible forms in solution including free elemental chlorine (Cl
acid (HOCl), hypochlorite (OCl
other species.
In the procedure an excess of potassium iodide is added to a water sample. Sample pH is
adjusted to pH 4 by addition of acetate buffer. The sample solution is then titrated
amperometrically with standard phenylarsine oxide solution.
®*
coated............................................................. 1 ....................... each.....................50085-00
Call toll-free 800-227-4224
Contact the HACH office or distributor serving you.
www.hach.com ; E-mail –
–
) ion, and chloramines (NH
Qty. required per test
techhelp@hach.com
= Free Chlorine Conc. + Combined
), hypochlorous
2
Cl, NHCl , etc.) among
2 2
Unit
HACH COMPANY
WORLD HEADQUARTERS
Telephone: (970) 669-3050
FAX: (970) 669-2932
50081_Chlorine_Total_Forward.fm
Cat. No.
3/07 3ed