GAS201L Total Sulphides Gastec Gas Detector Tubes 0.002 to 0.02 mg


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Excl. VAT: £29.50 Incl. VAT: £35.40
Excl. VAT: £29.50 Incl. VAT: £35.40

Product Description


GAS201L Sulphides Gastec Detector Tubes

1. The measured out mud and soil is put in the generation tube and 5mL of distilled water are added.
In case of muddy water, it suffices to add a small amount of distilled water (measured out in a graduated cylinder) to the gas generation tube.
Put the cap on the generation tube.

2. Both ends of the detector tube (No.201L) are broken off, and one end of the detector tube is connected to the gas generation tube and the other to the gas sampling pump
3. 18N 2 mL of sulphuric acid are added to the gas generation tube
4. Pull the handle of the gas sampling pump to draw in a sample of the generated hydrogen sulphide.
(By repeating this process several times, all sulphides become hydrogen sulphide several times repeatedly).
The scale in the detector tube is read, and the concentration of the sulphide in the sample is calculated.


Measuring Range

0.002 to 0.02 mg

Sampling Time

45 seconds per pump stroke

Detecting Limit

0.0002 mg (n=1)

Colour Change

White          Brown

Reaction Principle

Gus generation tube: Sulphides + H2SO4            H2S

Detector tube: H2S + Pb(CH3COO)2            PbS

Coefficient of Variation

5% (for 0.002 to 0.02mg)

Shelf Life

3 Years

Corrections for
temperature & humidity


Store the tubes at cool and dark place.


Possible coexisting substances and their interferences





Change colour by itself

Chloride ion


No error

No discoloration

Chromate ion


No error

No discoloration

Carbonate ion


No error

No discoloration

Calibration gas generation

Static gas dilution method


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Product Downloads

View FileGAS201L Sulphides Datasheet
View FileGastec Tubes Storage Guidelines
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