LaMotte COD Plus Colorimeter 1922-EX2 - Manual (Page 94)

HYDRAZINE
p-DIMETHYLAMINOBENZALDEHYDE METHOD
CODE 3656-SC
QUANTITY CONTENTS CODE
2x60 mL *Hydrazine Reagent A
*4841-H
10 g *Hydrazine Reagent B Powder
*4842-D
1 Pipet, 1.0 mL, plastic
0354
1 Spoon, 0.15 g, plastic
0727
*WARNING: Reagents marked with a * are considered hazardous substances. Material
Safety Data Sheets (MSDS) are supplied for these reagents. For your safety, read label
and accompanying MSDS before using.
Hydrazine, N
2
H
4
, is added to the water in high pressure boilers to reduce
corrosion by acting as an oxygen scavenger.
APPLICATION:
Water and boiler water, industrial waste water.
RANGE: 0.000 – 1.00 ppm Hydrazine
METHOD: p-Dimethylaminobenzaldehyde reacts with hydrazine under
acidic conditions to form a yellow color in proportion to the
amount of hydrazine present.
SAMPLE
HANDLING &
PRESERVATION: Samples should be analyzed as soon as possible after
collection due to the ease with which hydrazine becomes
oxidized. Acidification of the sample may increase the time
between collection and analysis.
INTERFERENCES: The substances normally present in water do not interfere
with the test, with the exception of strong oxidizing agents.
COD PLUS TEST PROCEDURES 6/02 HYDRAZINE 1/2