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Hydrogen Sulfide
Diagram
Specifications
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The main sources of H2S to the atmosphere are geothermal and biogenic. The anthropogenic sources are: · Petroleum refineries · Fish processing industry · Waste treatment plants · Catalysators of motor vehicles The passive sampler for hydrogen sulfide is based on the principle of the diffusion of H2S molecules onto an absorbant medium, in this case Cadmium sulphate. To reduce wind disturbance a glass fibre membrane is attached, supported by a wire net.

Diagram


  
Figure left: Determination of sampling rate under various laboratory conditions such as concentration range, humidity and exposure time

Figure right: H2S measurements in the vicinity of fish processing plants over time. Site 1 and 2 are near the fence line of different production plants and site 3 is in aremote residential are in a distance of 8 km. The measurements mirrors the production intensity in a plausible way.

Specifications

Samplingrate

10.9  ml/min at 20oC

Working range

1 — 50 µg/m3

Sampling time

2 — 4 weeks

Detection limit

0.2 µg/m3 for a sampling time of 14 days

External influences:
   wind speed
 influence of wind speed < 10% up to 6.0 m/sec
using protection shelters
   temperature
 no information
   humidity
 ± 10 %  between 20 to 80%

Storage

before use: 12 months
after exposure: 3 month

Cross sensitivity

Selective method

Expanded uncertainty*

25.2 % at concentration levels of 1 - 30 µg/m3

*according to GUM;
subject to change without notice
revised 3.1.2010

 
 
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