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H2S Microsensor

H2S microsensor with a tip diameter of 10 µm. The sensor is painted black to minimize light interference.
The H2S microsensor can be mounted with a sensor guide to fit directly into the chambers of the MicroRespiration System.
The H2S microsensor signal must be amplified on a Unisense amplifier e.g. the laboratory Microsensor Multimeter.
The H2S sensor can be mounted with a steel needle making it stronger on the longitudinal axis.
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Detect H2S in your sample

The H2S microsensor is a reliable tool for studying H2S production in a wide range of applications. Tip size can be made as small as 2-3 µM for high spatial resolution of H2S microprofiles. This combined with a fast response time of down to 0,3 seconds makes the H2S microsensor a high quality instrument for H2S investigations.

The H2S microsensor can be applied in a broad variety of research fields where non-destructive, fast and accurate measurements are required. The H2S microsensor is designed for research applications within:

  • Environmental sciences
  • Biomedical sciences
  • Biotechnology
  • Microbiology

Microsensor technology:

The Unisense H2S microsensor is a miniaturized amperometric sensor with an internal reference, a sensing and a guard anode. The anodes are polarized against an internal reference. Driven by the external partial pressure, H2S from the environment penetrates through the sensor tip membrane into the alkaline electrolyte, where the HS- ions formed are oxidized immediately by ferricyanide, producing sulfur and ferrocyanide.

The sensor signal is generated by re-oxidation of ferrocyanide at the anode in the tip of the sensor (Jeroschewski et al. 1996). The resulting sensor signal is in the pA range and is measured by a high quality picoammeter e.g. the Unisense Microsensor Multimeter. The internal guard electrode is polarized to scavenge H2S and facilitates  a constant ratio of ferri- to ferrocyanide in the electrolyte, thus minimizing the zero-current.

To calculate total sulfide concentrations, it is also required to measure the pH in the sample.

Ordering Information

Standard Glass Sensor Outside tip diameter
H2S-10 8-12 µm
H2S-25 20-30 µm
H2S-50 40-60 µm
H2S-100 90-110 µm
H2S-200 175-225 µm
H2S-500 400-600 µm
H2S-MR 400-600 µm
H2S-N 1,1 x 40 mm - needle sensor
H2S-NP 1,6 x 40 mm - needle sensor for piercing
H2S-Eddy 40-60 µm - for Edddy Correlation
H2S-50LR 40-60 µm - needle sensor for piercing and for low concentration range
H2S-100LR 90-110 µm - for low concentration range applications
H2S-500LR 400-600 µm - for low concentration range applications
H2S-NPLR 1,6 x 40 mm - needle sensor for piercing and for low concentration range

Find complete hydrogen sulfide microsensor specifications below and possible microsensor customizations and adaptations under Related Products found to the right.

View Specifications for H2S Microsensor

Technical information

View sensor specifications

Related products

Sensor customization

Jeroschewski,P. et al (1996), An Amperometric Microsensor for the Determination of H2S in Aquatic Environments, Anal Chem, 4351 - 4357, vol. 68 Read abstract

Stachowitsch,M. et al (2007), Oxygen depletion and benthic mortalities: the first in situ experimental approach to documenting an elusive phenomenon, Limnology and Oceanography: Methods, 344 - 352, vol. 5 Read abstract

Mohanakrishnan,J. et al (2008), Nitrite effectively inhibits sulfide and methane production in a laboratory scale sewer reactor, Water Research, 3961 - 3971, vol. 42 Read abstract

See all publications
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