Hach DR/850 Procedures Manual page 331

OXYGEN, DISSOLVED, Low Range,
Interferences
Summary of Method
REQUIRED REAGENTS & APPARATUS
Description
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
Hydrazine
Sodium hydrosulfite
Excess amounts of sodium thioglycolate, sodium ascorbate,
sodium ascorbate + sodium sulfite, sodium ascorbate + cupric
sulfate, sodium nitrite, sodium sulfite, sodium thiosulfate, and
hydroquinone do not cause significant interference.
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.
continued
Interference Levels and Treatments
100,000 fold excess will begin to reduce the oxidized
form of the indicator solution.
Reduces the oxidized form of the indicator solution and
will cause a significant interference.
Quantity Required
Per Test
331
Unit Cat. No.