Hach DR2400 Manual page 698

Quaternary Ammonium Compounds
Method Performance
Summary of Method
Required Reagents
Description
Quaternary Ammonium Compounds Reagent Set (100 tests) .................................................................24592-00
Includes:
(4) QAC Reagent 1 Powder Pillows ................................................ 2 pillows ......... 50/pkg...............24010-66
(8) QAC Reagent 2 Powder Pillows ................................................ 2 pillows ......... 25/pkg...............24012-68
Required Apparatus
Clippers, for opening powder pillows .................................................. 1 ....................... each........................968-00
Cylinder, graduated, 25-mL .................................................................... 1 ....................... each........................508-40
Sample Cells, 10-20-25 mL, w/cap......................................................... 2 ....................... 6/pkg.................24019-06
Required Standards
QAC Standard Solution, 100-mg/L as CTAB................................................................. 100 mL...............24153-42
Water, deionized ................................................................................................................. 4 liters ....................272-56
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Precision
Standard: 1.8 mg/L CTAB
Program
401
See Section 3.4.3 Precision on page 44 for more information, or if the standard
concentration did not fall within the specified range.
Sensitivity
Portion of Curve
Entire range
See Section 3.4.5 Sensitivity on page 44 for more information.
The test method makes use of a colorimetric chemistry in which a quaternary
ammonium compound reacts with an indicator to produce a color change from
pale pink to vivid purple. The test is conducted in a stabilized, acid-buffered
solution containing a masking agent to eliminate potential interferences. This
test is applicable to the monitoring of QACs in swimming pools and cooling
towers. Test results are measured at 575 nm.
Call toll-free 800-227-4224
Contact the HACH office or distributor serving you.
www.hach.com ; E-mail – techhelp@hach.com
95% Confidence Limits of Distribution
1.4–2.2 mg/L CTAB
∆Abs
0.010
Quantity Required
per test
QuaternaryAmmCom_PP_Other_DBC_Eng_Ody.fm
∆Concentration
0.04 mg/L CTAB
Unit Cat. No.
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WORLD HEADQUARTERS
Telephone: (970) 669-3050
FAX: (970) 669-2932
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