Comparison of headspace and compact sensor measurements of tropical lake pCO2

Cite this:
Vale, D. R. do. (2017). Comparison of headspace and compact sensor measurements of tropical lake pCO2. Academy of Agriculture Journal, 2(03). https://doi.org/10.15520/aaj.v2i3.21
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Abstract

The objective of this study was to present the first results of direct and continuous measurements of pCO2, performed with a compact sensor in an Amazonian tropical lake and compare and evaluate these measures with the measures carried out using the headspace method. Direct measurements of pCO2were performed using a compact sensor and the headspace method over a day. Descriptive statistical analysis, normality tests, parametric tests to compare the results and linear regression were performed. The tests reveal that the methods present significant difference and therefore a linear regression model for future calibration of data from the compact sensor was built. The overestimation of pCO2 by the compact sensor (pCO2C) relative to the headspace method (pCO2H) was mainly due to the biofouling on the face of the sensor membrane. It is suggested that long-term measurements with immersed sensors be avoided, and if use of immersed sensors is necessary to perform such measurements, that periodic sensor cleaning is done and a water pump is inserted in the system, for the purpose of reducing the uncertainty of the measurements.

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