Development and field application of a low-cost device for sampling greenhouse gas fluxes at the air-water interface in limnological studies

Abstract Aim The objective of the present study was to develop and field-apply a simple device for sampling greenhouse gas flows (CO2 and CH4) at the air-water interface. Methods The device consisted of a cylindrical chamber made of high-density polyethylene with a valve to collect gases. The chamber sealing materials (silicone rubber and epoxy resin) and the system configuration (area/volume ratio A/V, and influence of ventilation) were evaluated. The device was applied in five field campaigns (n = 45). The samples were stored in gasometric containers until analysis by gas chromatography with flame ionization detection. Results The epoxy resin sealed the chambers better, while the non-vented device with a higher A/V ratio showed better mixing with fewer uncertainties in gas diffusion through boundary layer disturbance. The flow rates of the target gases varied greatly, from below the limit of quantification for CH4 (< 0.062 mg m-2 min-1) to 0.214 mg m-2 min-1, and from 0.3 to 42.3 mg m-2 min-1 for CO2. Conclusions These chambers minimize disturbances to the water body and the natural gas exchange processes obtaining more representative data on the natural emissions. Our floating chamber device proved robustness and versatility for determining gas flows at the air-water interface. However, its use must be evaluated in preliminary field work to define the sampling interval time, uncertainties and main analytical challenges to be overcome.

• Publication year

  2025

• Venue

  Acta Limnologica Brasiliensia

• Publication date

  Unknown publication date

• Fields of study

  Not labeled

• Identifiers
  DOI 10.1590/s2179-975x4023
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar

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• No concepts are published for this paper.

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