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(Temperature in Kelvin)
100
75
50
25
0
0
Figure 1. The species distribution of H2S, HS and S2- as a function of
pH.
As H
S sensors are sensitive to temperature, it is necessary to
2
perform calibration and measurements at the same temperature .
Please note that, in contrast to oxygen, the relationship between
salinity, temperature and solubility is not well known and
therefore not tabled for sulfide gas
c
alibration in the laboratory
Calibration must be performed after the sensor signal has
stabilized during pre-polarization . The H
linearly over a certain range (e .g . 0-300 µM), above which the slope
of the response curve decreases, but the response and resolution
above the linear range may be sufficiently good for reliable
measurements . We suggest that you establish the linear range by
making a coarse calibration in the entire concentration range of
interest . If measurements of concentrations above the linear range
are needed, a calibration with sufficient resolution has to be made
in the non-linear range, whilst a 3-point calibration is sufficient in
the linear range .
H
S
2
HS
-
S
-
2
4
6
10
8
pH
S microsensor responds
2
12
14
13
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