LaMotte NITROGEN DIOXIDE IN AIR TEST KIT User Manual
Page 3
PRO CE DURE
1.
Pour 10 mL of *Nitrogen Dioxide #1 Absorbing Solution (7684) into
the impinging tube.
2.
Connect impinging apparatus to intake of air sampling pump
†
. Make
sure the long tube is immersed in the absorbing solution.
3.
Attach special adapter to intake of pump to sample at 0.2 Lpm.
Sample for 10 minutes or until a measurable amount of nitrogen
dioxide is absorbed.
4.
At the end of the sampling time pour contents of impinging tube into
test tube (0822). Dilute to 10 mL with absorbing solution if necessary
to replace solution which evaporated during sampling.
5.
Use the pipet (0352) to add 1 drop of *Nitrogen Dioxide Reagent #2
(7685). Cap and mix.
6.
Use the 0.05 g spoon (0696) to add 0.05 g of Nitrogen Dioxide
Reagent #3 Powder (7688). Cap and mix. Wait 10 minutes for full
color development.
7.
Place test tube into the Nitrogen Dioxide Comparator (7689). Match
sample color to index of color standards. Record the index number
which gives the proper color match.
8.
Use chart below to convert index reading to a concentration. Record
as ppm Nitrogen Dioxide.
NITROGEN DIOXIDE IN AIR CALIBRATION CHART**
TIME
COMPARATOR INDEX NUMBER
(min)
1
2
3
4
5
6
7
8
1
0.00
2.8
7.0
14.0
21.0
28.0
42.0
56.0
5
0.00
0.56
1.40
2.80
4.20
5.60
8.40
11.20
10
0.00
0.28
0.70
1.40
2.10
2.80
4.20
5.60
15
0.00
0.19
0.47
0.93
1.40
1.87
2.80
3.74
20
0.00
0.14
0.35
0.70
1.05
1.40
2.10
2.80
**Values in ppm
†
For reference analysis of nitrogen dioxide, a gas bubbler impinger (0934)
is recommended. For general applications and demonstration, a general
purpose impinger (0922) or standard midget impinger (0933) may be
used.