33.3.1.5 Hydrogen Evolution
Hydrogen gas measurement can be used for in situ detection of nZVI reaction
directly within the monitoring wells as well as for characterization of nZVI slurry
or nZVI transformation products after their acid digestion (Filip et al. 2018).
Sophisticated portable gas detectors can serve for in situ H 2 concentration measurements. Evaluation of H 2 content in the wells is an easy and fast method but the
drawback is the low sensitivity and the fact that it can be influenced by microbial
activity resulting in hydrogen production. On the other hand, simple gas volumetric
apparatus (nZVI tester developed by NANO IRON s.r.o., Czech Republic) enables
volumetric measurements of the gas evolved from the reaction of nZVI with acids
(Fig. 33.7).
Fig. 33.6 Portable XRF
analyzer used for
investigation of the
boreholes drilled on
Spolchemie Site I
Fig. 33.7 nZVI tester can be transported either (a) disassembled in a case or (b) assembled and
used for indirect measurement of Fe
0 content in the sample
33 Tool IV: Monitoring of nZVI Migration and Fate in the Groundwater Conditions
639
Hydrogen gas measurement can be used for in situ detection of nZVI reaction
directly within the monitoring wells as well as for characterization of nZVI slurry
or nZVI transformation products after their acid digestion (Filip et al. 2018).
Sophisticated portable gas detectors can serve for in situ H 2 concentration measurements. Evaluation of H 2 content in the wells is an easy and fast method but the
drawback is the low sensitivity and the fact that it can be influenced by microbial
activity resulting in hydrogen production. On the other hand, simple gas volumetric
apparatus (nZVI tester developed by NANO IRON s.r.o., Czech Republic) enables
volumetric measurements of the gas evolved from the reaction of nZVI with acids
(Fig. 33.7).
Fig. 33.6 Portable XRF
analyzer used for
investigation of the
boreholes drilled on
Spolchemie Site I
Fig. 33.7 nZVI tester can be transported either (a) disassembled in a case or (b) assembled and
used for indirect measurement of Fe
0 content in the sample
33 Tool IV: Monitoring of nZVI Migration and Fate in the Groundwater Conditions
639