LaMotte SMART3 Colorimeter User Manual

Page 230

APPLICATION:

Boilers

RANGE:

0.000–0.700 ppm DEHA (Diethylhydroxylamine)

0.000–0.900 ppm Carbohydrazide

0.00–3.00 ppm Erythorbic Acid

0.00–2.00 ppm Hydroquinone

0.00–3.00 ppm Methylethylketoxime

MDL:

0.004 ppm DEHA

0.01 ppm Carbohydrazide

0.02 ppm Erythorbic Acid

0.01 ppm Hydroquinone

0.01 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.

OXYGEN SCAVENGERS

SMART3 Test Procedures 11.10

Test P

rocedures