LaMotte Dissolved Oxygen Water Quality Test Kit - Manual (Page 17)

17
EPA COMPLIANCE
To qualify as an EPA accepted test, and to achieve the greatest accuracy, the Sodium
Thiosulfate Solution, 0.025N (4169) must be standardized daily. This procedure follows
Standard Methods for the Examination of Water and Wastewater. Numbers in ( ) are for
LaMotte products. These products are not included in this kit but can be ordered from
LaMotte Company by using the specifi ed code number.
1. 2.
3. 4.
6. 5.
Use a 10 mL graduated
cylinder (0416) to add 15
mL of Deionized Water
(5115) to the titration tube
(0608).
Use a Direct Reading
Titrator, 0-1 Range (1.0
mL capacity) (0376) to
add 2 mL of Potassium
Bi-iodate (7346).
Add 2 drops of Sulfuric
Acid, 5N (8517WT). Use the 0.1 g spoon
(0699) to add 0.2 g
Potassium Iodide
Crystals (6809).
Swirl to dissolve.
Solution will turn
yellowish brown.
Fill another Direct Reading
Titrator (0376) with Sodium
Thiosulfate Solution, 0.025N
(4169).
continued . . .