Petroleum naphtha NO.106


Performance

Measuring Range

0.5 to 1 mg/l

1 to 14 mg/l

14 to 28 mg/l

Number of Pump Strokes

2

1

1/2

Correction Factor

1/2

1

2

Sampling Time

1 minute per pump stroke

Detecting Limit

0.1 mg/l (n=2)

Color Change

Orange Dark Green

Reaction Principle

Petroleum naphtha reduces chromic acid to form
chromic sulfate to produce dark green color.
Coefficient of Variation 10% (for 1 to 4 mg/l), 5% (for 4 to 14 mg/l)
Shelf Life 3 Years
Corrections for
temperature & humidity		 Unnecessary
Store the tubes at cool and dark place.


Possible coexisting substances and their interferences (NOTE)

Substance

Concentration

Interference

Change color by itself

Sulfur dioxide

500 ppm

Plus error

Produce green color

Hydrogen sulfide

500 ppm

Plus error

Produce blackish brown
(500 ppm)

Acetylene

3%

Unable to measure

Produce blackish brown
for whole laer

Propane

0.2%

Unable to measure

Produce blackish brown
for whole layer

Organic solvents

 -

Plus error

Produce greenish brown

Other substance measurable with this detector tube

Substance

Correction Factor

Pump Strokes

Measuring Range

Petroleum benzene

1.0

1/2, 1 or 2

0.5 to 28 mg/l

Petroleum ether

1.0

1/2, 1 or 2

0.5 to 28 mg/l


Calibration gas generation Static gas dilution method


TLV-TWA TLV-STEL Explosive range
- - 1.1 to 5.9%

Copyright(c) 2001 GASTEC CORPORATION. All rights reserved.