LaMotte LSC User Manual

CHROMATE TEST KIT

L

Mott

WARNING! This set contains chemicals

that may be harmful if misused. Read

cautions on individual containers

carefully. Not to be used by children

except under adult supervision

MODEL LSC • CODE 4430

QUANTITY CONTENTS CODE

30 g *Chromate Indicator Powder *4431-G
1 Spoon, 0.25g, plastic 0695
1 Pipet, plain, plastic 0352
2 Test Tubes, 5 mL, glass, w/caps 0230
1 Sodium Chromate Comparator, 5 - 40 ppm 4432

*WARNING: Reagents marked with an * are considered to be potential health
hazards. To view or print a Material Safety Data Sheet (MSDS) for these reagents go to
www.lamotte.com. To obtain a printed copy, contact LaMotte by e-mail, phone or fax.

To order individual reagents or test kit components, use the specified code number.

USE OF THE OCTET COM PARA TOR

The Octet Comparator contains eight permanent
color standards. A test sample is inserted into the
openings in the top of the comparator. The sample
can then be compared to four color standards at
once, and the value read off the comparator. For
optimum color comparison, the comparator should
be positioned between the operator and a light
source, so that the light enters through the special
light-diffusing screen in the back of the
comparator. Avoid viewing the comparator against
direct sunlight or an irregularly lighted background.

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
(Na2CrO4). 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 [phone]

Visit us on the web at www.lamotte.com

®

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