LaMotte QUAT TEST KIT QAC2-DC - Manual (Page 2)

4. Add Toluidine Blue O Indicator (3995) as follows:
25 mL sample, add 8 drops;
10 mL sample, add 3 drops;
5 mL sample, add 2 drops.
Swirl to mix. Sample should turn light blue.
5. While swirling test tube, add Quat
Titrating Solution (3996) one drop
at a time, until color changes from
blue to purple. Hold bottle vertically.
For best results, when the color
change is first detected, use the
Endpoint Color Chart (3613-CC) as
shown to match the color of the
solution exactly to the endpoint.
Continue adding Quat Titrating
solution one drop at a time, until
color matches endpoint. Count the
number of drops added.
6. Calculate result in ppm.
25 mL sample: subtract three (3) from number of drops used in
Step 5. Multiply by 2.
10 mL sample: subtract one (1) from number of drops used in
Step 5. Multiply by 5.
5 mL sample: subtract one (1) from number of drops used in step
5. Multiply by 10.
Record as ppm Quat.
NOTE:
The quat equivalence is based on n-alkyldimethylbenzyl
ammonium chloride, molecular weight 360. If a quat of different
molecular weight is tested, multiply the equivalence by:
equivalence
molecular weight
´
360
LaMOTTE COM PANY
Helping Peo ple Solve An a lyt i cal Challenges SM
PO Box 329 • Chestertown • Mary land • 21620 • USA
800-344-3100 • 410-778-3100 (Out side USA) • Fax 410-778-6394
Visit us on the web at www.lamotte.com
03/10
Stop