Microsensor for simultaneous measurement of H2 and H2S

Maegaard, Karen; García‐Robledo, Emilio; Revsbech, Niels Peter

doi:10.1016/j.snb.2017.12.096

Cited by 3 publications

(1 citation statement)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this study, we show how the problem of difficult alignment of microsensors for the study of H 2 S oxidation can be solved. It has earlier been shown that a single sensor can be used for simultaneous and spatially coincident measurement of O 2 /N 2 O (Revsbech et al 1988), H 2 /O 2 (Maegaard et al 2017), and H 2 /H 2 S (Maegaard et al 2018). We here expand this range of combined sensors with a sensor for measuring H 2 S and O 2 .…”

mentioning

confidence: 99%

From two sensors to a single sensor: Better understanding of oxygen–sulfide interfaces

Steininger

Veerubhotla

Revsbech

et al. 2023

Limnology & Ocean Methods

Self Cite

View full text Add to dashboard Cite

Intense biogeochemical transformations in sediments and biofilms may occur over sub‐mm distances. Our current understanding of those transformations in such narrowly stratified environments has been facilitated by the introduction of microsensors. Until now most studies have been conducted using individual sensors for the various chemical species, and careful vertical alignment of the sensor tips is then essential for the meaningful interpretation of the resulting data. For instance, the determination of total dissolved sulfide (TDS) at high resolution requires perfect alignment of sensors for H2S and pH, as the pKa for H2S is close to ambient pH. In this study, we show how a recently developed TDS sensor and a new combined H2S/O2 microsensor can improve the analysis of sulfidic environments including the oxygen–sulfide interface. The TDS sensor does not require pH correction unlike the conventional H2S sensor, and it thus eliminates the need for a simultaneous pH measurement. The combined sensor allows for perfect alignment of H2S and O2 micro profiles and makes it possible to not only more accurately estimate fluxes, but also to determine overlapping zones of oxygen and dissolved sulfide at very high resolution.

show abstract

mentioning

confidence: 99%