SKU: GAS201L Category:

GAS201L Total Sulphides Gastec Gas Detector Tubes 0.002 to 0.02 mg

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inc. VAT
Preferred Communication Method
This field is for validation purposes and should be left unchanged.
SKU: GAS201L Category:


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
Substance Concentration Interference 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

Additional Information

Weight 0.1 kg
Gas Range



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