Gastec 201L Sulphide in Solution Tube (0.002 ~ 0.02 mg)

Manufacturer: Gastec
Model: 201L
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Specifications
Manufacturer Info

Indicator: 0.002 ~ 0.02 mg
Measuring Range: 0.002 ~ 0.02 mg
Sampling Time: 45 seconds per 1 pomp stroke
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 0.02 mg)
Nr. of tests: 10
Option Kit: HYDROTEC-S [No.330]

Details

Performance

Measuring Range	0.002 to 0.02 mg
Sampling Time	45 seconds per 1 pomp stroke
Detecting Limit	0.0002 mg
Colour Change	White → Brown
Reaction Principle	Gus generation tube : Sulphides + H2SO4 → H2S Detector tube : H2S + Pb(CH3COO)2 → PbS
Shelf Life	3 Years
Corrections for temperature & humidity	Unnecessary
Coefficient of Variation	5% (for 0.002 to 0.02 mg)

Possible coexisting substances and their interferences (NOTE)

Substance

Concentration

Interference

Changes colour by itself to

Chloride ion	No	No
Chromate ion	No	No
Carbonate ion	No	No

Calibration gas generation

Static gas dilution method

For measuring sulphides in waste water and sludge

HYDROTEC-S

[No.330]

This kit enables quick measurement (approx. 10 min.) of sulphide in bodies of water or in waste water without any special equipment and skills. Take a sample with the gas generator tube, add sulphuric acid and simply measure the amount of hydrogen sulphide generated using the detector tube.
201H / 201L

Measurement procedure

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.

Both ends of the detector tube (No.201H or 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.

18N 2 mL of sulphuric acid are added to the gas generation tube.

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.