LaMotte CHROMATE TEST KIT LSC - Manual (Page 2)

PRO CE DURE
1.
Use the pipet (0352) to add ten drops of sample water to a test tube
(0230).
2. Dilute to 5 mL line with chromate-free water.
3. Use the 0.25 g spoon (0695) to add one measure of *Chromate
Indicator Powder (4431). Cap and shake until the powder has
dissolved. Wait 60-90 seconds for full color development.
4. Insert test tube into the Sodium Chromate Comparator (4432).
Match sample color to a color standard. Record as ppm Sodium
Chromate.
If the color of the test sample is less than the color of the lowest standard,
repeat the test using a sample of the water without dilution and divide the
value of the standards by ten. If the color of the test sample in the original test
is deeper than the highest value, the test is run again with a more dilute
sample. See Dilution Factor Table below.
DI LU TION FACTOR TA BLE
FOR SO DIUM CHROMATE COM PARA TOR
Note that the values given on the Sodium Chromate Comparator represent
readings where the test sample has been diluted one part of test sample to
nine parts of chromate-free water. This test can also be performed with
different dilution ratios to reach the desired range.
Undiluted Sample Range 0.5 to 4.0 ppm
Ten Drops to 5.0 mL Range 5 to 40 ppm
Five Drops to 5.0 mL Range 10 to 80 ppm
One Drop to 5.0 mL Range 50 to 400 ppm
CON VER SIONS
The values shown on the comparator are in terms of Sodium Chromate
(Na
2
CrO
4
). For converting the Sodium Chromate readings to other forms of
chromate, use the following factors:
Potassium Dichromate Comparator Reading x 0.9
Chromic Acid Comparator Reading x 0.62
Hexavalent Chromium Comparator Reading x 0.32
LaMOTTE COM PANY
Helping Peo ple Solve An a lyt i cal Challenges ®
PO Box 329 • Chestertown • Mary land • 21620 • USA
800-344-3100 • 410-778-3100 (Out side U.S.A.) • Fax 410-778-6394
Visit us on the web at www.lamotte.com
10.10