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Nitrogen dioxide (NO2)
Item Item Details
(Price is for domestic US market only)
Nitrogen dioxide (NO2)
Item Name:
Nitrogen dioxide (NO2)
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Nitrogen dioxide NO2 NO.9D



Measuring Range

0.1 to 30 ppm

Sampling Hours

1 to 10 hours

Detecting Limit

0.05 ppm (10 hours)

Color Change

White Yellow

Reaction Principle

Nitrogen dioxide oxidizes o-toluidine for form yellow color stain.
NO2 + o-Toluidine Yellow product

Coefficient of Variation 10% (for 1 to 30 ppm-hr)
Shelf Life 1 Year
Corrections for
temperature & humidity
Temperature correction is necessary
Store the tubes in the refrigerator to keep at 10oC (50oF) or below.

Possible coexisting substances and their interferences (NOTE)




Change color by itself



Plus error

Discolor yellow stain

Carbon monoxiide
Nitric oxide
Sulfur dioxide
Organic vapor
- No effect No discoloration

Calibration gas generation Permeation tube method

TLV-TWA TLV-STEL Explosive range
3ppm 5ppm -

Range 0.1-30

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