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A sampling technique for the determination of dissolved methane in soil solution

: Alberto, M.C.R.; Arah, J.R.M.; Neue, H.U.; Wassmann, R.; Lantin, R.S.; Aduna, J.B.; Bronson, K.F.


Chemosphere 2 (2000), Nr.1, S.57-63
ISSN: 1465-9972
Fraunhofer IFU; 2002 in Helmholtz-Gesellschaft integriert
wetland rice field; soil entrapped methane; dissolved methane; soil solution sampler; soil core sampler

A sampling technique was developed to sample floodwater and soil solution from wetland ricefields for the determination of dissolved CH4. The method was compared with the soil core method used in the measurement of entrapped CH4. This was done to assess if dissolved CH4 determination could be an alternative to soil-entrapped CH4 measurements since the latter is time-consuming. laborious and destructive in nature.
The dynamics of both dissolved CH4 and entrapped CH4 follow the same seasonal pattern. They have the same degree of spatial and temporal variability. However, the sampling procedure developed for the determination of dissolved CH4 is relatively simple, easy and convenient compared to that for soil-entrapped CH4 measurements. It also allows in-situ solution sampling at different soil depths. Therefore, it is recommended that dissolved CH4 measurements can be an alternative to soil-entrapped CH4 determinations.