LaMotte SMART3 Colorimeter - 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