LaMotte SMART Spectro Spectrophotometer - Manual (Page 184)

OXYGEN SCAVENGERS
DEHA (Diethylhydroxylamine), Carbohydrazide, Erythorbic Acid,
Hydroquinone, Methylethylketoxime
IRON REDUCTION METHOD • CODE 4857
QUANTITY CONTENTS CODE
15 mL *DEHA Reagent #1 *4791-E
15 mL *DEHA Reagent #2 *4792-E
15 mL *DEHA Reagent #3 *4793-E
*WARNING: Reagents marked with a * are considered to be potential health hazards. To view
or print a Material Safety Data Sheet (MSDS) for these reagents see MSDS CD or
www.lamotte.com. To obtain a printed copy, contact LaMotte by e-mail, phone or fax.
Oxygen can lead to corrosion in many parts of a boiler. Oxygen scavengers are
added to the water to eliminate oxygen and thus decrease the chance of
corrosion. Diethylhydroxylamine (DEHA) is a volatile oxygen scavenger used
in boilers. It can also passivate steel and has a low toxicity.
APPLICATION: Boilers
RANGE: 0.000–0.700 ppm DEHA (Diethylhydroxylamine)
0.000–0.900 ppm Carbohydrazide
0.00–3.00 ppm Erythorbic Acid
0.00–1.80 ppm Hydroquinone
0.00–3.00 ppm Methylethylketoxime
METHOD: Ferric iron is reduced to ferrous iron by oxygen scavengers in
proportion to the concentration in the sample. The resulting
ferrous iron reacts with an indicator to produce a purple
color.
SAMPLE
HANDLING &
PRESERVATION: Analyze samples immediately. Rinse sample containers and
glassware with 1:1 hydrochloric acid to avoid iron
contamination.
INTERFERENCES: Other oxygen scavengers, such as DEHA, carbohydrazide,
erythorbic acid, hydroquinone and methylethylketoxime will
interfere. Stray light and substances which complex iron or
reduce ferric iron will also interfere.
SMART SPECTRO TEST PROCEDURES 05.04 Oxygen Scavengers 1/6