NDLI: Submicromolar Oxygen Profiles at the Oxic–Anoxic Boundary of Temperate Lakes

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Submicromolar Oxygen Profiles at the Oxic–Anoxic Boundary of Temperate Lakes

Content Provider	Springer Nature Link
Author	Kirf, Mathias K. Dinkel, Christian Schubert, Carsten J. Wehrli, Bernhard
Copyright Year	2013
Abstract	Elements involved in biogeochemical cycles undergo rapid turnover at the oxic–anoxic interface of stratified lakes. Here, the presence or absence of oxygen governs abiotic and biotic processes and rates. However, achieving a detailed sampling resolution to precisely locate the oxic–anoxic interface is difficult due to a lack of fast, drift-free sensors in the working range of 10 to a few 1,000 nmol O2 L−1. Here, we demonstrate that conventional amperometric and optical microsensors can be used to resolve submicromolar oxygen concentrations in a continuous profiling mode. The amperometric drift was drastically reduced by anoxic preconditioning. In situ offset correction in the anoxic layer and a high amplification scheme allowed for an excellent detection limit of < 10 nmol L−1. The optical microsensors also showed a similar performance with a detection limit of < 20 nmol L−1. Their drift stability allowed for a laboratory calibration in combination with a minor in situ anoxic offset correction. The two different sensor systems showed virtually identical profiles during parallel use in stratified lakes. Both sensors were able to resolve the fine-scale structure at the oxic–anoxic interface and revealed hitherto unnoticed extended zones of submicromolar oxygen concentrations even below a steep oxycline. The zones extended up to several meters and showed substantial vertical variability. These results underline the need of a precise localization of the oxic–anoxic interface on a submicromolar scale in order to constrain the relevant aerobic and anaerobic redox processes.
Starting Page	39
Ending Page	57
Page Count	19
File Format	PDF
ISSN	13806165
Journal	Aquatic Geochemistry
Volume Number	20
Issue Number	1
e-ISSN	15731421
Language	English
Publisher	Springer Netherlands
Publisher Date	2013-10-17
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Oxic–anoxic interface Nanomolar oxygen Detection limit Anoxia Redox Gradient Stratification Optode Amperometric Microsensor Signal drift Geochemistry Hydrology/Water Resources Hydrogeology
Content Type	Text
Resource Type	Article
Subject	Geophysics Geochemistry and Petrology

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