LaMotte SULFUR DIOXIDE IN AIR User Manual

SULFITE IN WATER TEST KIT

L

M

o

tt

AU TO MATIC BURET METHOD

MODEL AB-SIT · CODE 7176

QUANTITY CONTENTS CODE

120 mL *Sulfite Reagent A *7327-J
60 mL Sulfite Reagent B 7328-H
2 x 230 mL Sulfite Reagent C 7329-K
2 Pipets, 1.0 mL, plastic 0354
2 Erlenmeyer Flasks, 125 mL, glass 0431
1 Graduated Cylinder, 50 mL, glass 0418
1 Automatic Buret, squeeze valve 0427

*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.

Read the Automatic Buret Instruction Manual before proceeding. A
50 mL test sample is used. Each mL of Sulfite Reagent C used is equal
to 20 parts per million of Sulfite (SO

NOTE: Sulfite standards deteriorate quickly and must be tested
immediately. To improve stability, Standard Methods (17th Edition, 4500

-2

- SO

B) suggests adding 1 mL of an EDTA solution (2.5 g Disodium

3

EDTA/100 mL Distilled Water) per 100 mL sample. The sample still
must be tested immediately and taken with minimal air contact.

-2

).

3

PRO CE DURE

1. Use a 1.0 mL pipet (0354) to add 2 mL of *Sulfite Reagent A
(7327) to an Erlenmeyer flask (0431).

2. Fill graduated cylinder (0418) to 50 mL mark with sample water.
Transfer to Erlenmeyer flask.

3. Use a second 1.0 mL pipet (0354) to add 1.0 mL of Sulfite Reagent
B (7328). Swirl to mix.

4. Fill buret (0427) with Sulfite Reagent C (7329). While gently
swirling flask, slowly add Sulfite Reagent C until sample turns a
faint but permanent blue. Record buret reading.

5. Multiply buret reading by 20. Record as ppm Sulfite.
EXAMPLE: The endpoint color change occurred when the level

of liquid in the automatic buret column was at the 7.3 mL
graduation. The result of the test is:

7.3 x 20 = 146 parts per million

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

®

12.05