Quaternary Ammonium Compounds
© Hach Company, 2003. All rights reserved. Printed in the U.S.A. 3/04 1ed
Page 4 of 4 QuaternaryAmmCom_PP_Other_DBC_Eng_Ody.fm
HACH COMPANY
WORLD HEADQUARTERS
Telephone: (970) 669-3050
FAX: (970) 669-2932
FOR TECHNICAL ASSISTANCE, PRICE INFORMATION AND ORDERING:
Call 800-227-4224
Contact the HACH office or distributor serving you.
www.hach.com techhelp@hach.com
In the U.S.A. –
Outside the U.S.A. –
On the Worldwide Web – ; E-mail –
toll-free
Method Performance
Precision
Standard: 1.8 mg/L CTAB
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
See Section 3.4.5 Sensitivity on page 44 for more information.
Summary of Method
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.
Required Reagents
Quantity Required
Description per test Unit Cat. No.
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
Program 95% Confidence Limits of Distribution
401 1.4–2.2 mg/L CTAB
Portion of Curve ∆Abs ∆Concentration
Entire range 0.010 0.04 mg/L CTAB
To Next Page
Loading...
