Hydrazine – LaMotte DC1600 Colorimeter User Manual
Page 41
HYDRAZINE
p-DIMETHYLAMINOBENZALDEHYDE METHOD
CODE 3656
QUANTITY
CONTENTS
CODE
2 x 60 mL
*Hydrazine Reagent A
*4841-H
10 g
*Hydrazine Reagent B Powder
*4842-D
1
Pipet, 1.0 mL, plastic
0354
1
Spoon, 0.1 g, plastic
0699
*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 of pipes and fittings by acting as an
oxygen scavenger.
APPLICATION:
Water and boiler water, industrial wastewater.
RANGE:
0 – 1.0 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.
PROCEDURE
1.
Rinse a clean colorimeter tube (0967) with sample water. Fill to the 10 mL line with sample.
2.
Select setting 2 on “Select Wavelength” knob and press “30 Second Read” button.
3.
Insert tube into colorimeter chamber and adjust to 100%T with “Set Blank” knob. This tube is the 100%T blank.
4.
Remove tube from colorimeter. Use the 1 mL pipet (0354) to transfer 4 mL of *Hydrazine Reagent A (4841). Cap and
mix.
5.
Use the 0.1 g spoon (0699) to add one measure of *Hydrazine Reagent B Powder (4842). Cap and mix. Wait 10
minutes for maximum color development. An undissolved portion of Hydrazine Reagent B may remain in bottom of
tube without adversely affecting results.
6.
At end of 10 minute waiting period, press “30 Second Read” button and insert tube into colorimeter chamber. Record
%T as soon as reading stabilizes.
7.
Consult calibration chart to determine hydrazine concentration in parts per million (ppm).
DC1600 HYDRAZINE CALIBRATION CHART
%T
9
8
7
6
5
4
3
2
1
0
90
0.01
0.01
0.02
0.02
0.02
0.03
0.03
0.03
0.04
0.04
80
0.04
0.04
0.05
0.05
0.05
0.06
0.06
0.06
0.07
0.07
70
0.07
0.08
0.08
0.09
0.09
0.09
0.10
0.10
0.10
0.11
60
0.11
0.12
0.12
0.12
0.13
0.13
0.14
0.14
0.15
0.15
50
0.16
0.16
0.17
0.17
0.18
0.18
0.19
0.19
0.20
0.20
40
0.21
0.21
0.22
0.23
0.23
0.24
0.24
0.25
0.26
0.26
30
0.27
0.28
0.29
0.29
0.30
0.31
0.32
0.33
0.34
0.35
20
0.36
0.37
0.38
0.39
0.40
0.41
0.42
0.43
0.45
0.46
10
0.48
0.49
0.51
0.52
0.54
0.56
0.58
0.61
0.63
0.66
0
0.69
0.72
0.76
0.81
0.86
0.92
1.01
41