Hach DR/850, Procedures Manual, Page: 331 / 460

331
Interferences
Excess amounts of sodium thioglycolate, sodium ascorbate,
sodium asc sodium sulfite, sodium asc cupric
sulfate, sodium nitrite, sodium sulfite, sodium thiosulfate, and
hydroquinone do not cause significant interference.
Summary of Method
When the vacuum-sealed AccuVac ampul is broken open in a
sample containing dissolved oxygen, the yellow reagent solution
turns blue. The blue color is proportional to the dissolved oxygen
concentration.
REQUIRED REAGENTS & APPARATUS
Quantity Required
Description Per Test Unit Cat. No.
Low Range Dissolved Oxygen AccuVac Ampuls... 1 ampul..................25/pkg ..........25010-25
Beaker, 50 mL ...............................................................1 ...........................each ...........500-41H
Sample Cell, 10-20-25 mL, w/cap ................................1 .........................6/pkg ..........24019-06
OPTIONAL REAGENTS AND APPARATUS
AccuVac Snapper Kit ..................................................................................each ..........24052-00
Sodium Hydrosulfite, technical grade....................................................... 500 g ..............294-34
For Technical Assistance, Price and Ordering
In the U.S.A.—Call 800-227-4224
Outside the U.S.A.—Contact the Hach office or distributor serving you.
Interfering Substance Interference Levels and Treatments
Hydrazine 100,000 fold excess will begin to reduce the oxidized
form of the indicator solution.
Sodium hydrosulfite Reduces the oxidized form of the indicator solution and
will cause a significant interference.
OXYGEN, DISSOLVED, Low Range,
continued