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GHG measurement in aquaculture ponds:

   

A prototype floating chamber was fabricated to measure GHGs in aquaculture ponds. The chamber, air sampling pump and tedlar bag were connected in series by silicon tubing with a three way valve, to control the circulation of flux and further flow into the tedlar bag. The GHG fluxes (changes in concentration with time) diffusing across the water-air interface was collected at different time intervals in tedlar bags and taken to the laboratory for analysis. The simultaneous analysis and quantification of GHGs (Carbon-di-oxie, methane & nitrous oxide) from the above matrices was done with single injection using multi-valve, ìECD, methanizer - FID combination detector. Pond water and slurry were taken directly into the headspace vials and analysed with the aid of headspace auto sampler in the GHG analyser.CH4, CO2 and N2O concentration in tested ponds ranged from 1.25 - 3.92 ppm, 49-294 ppm and 233-295 ppb in water and 2.06-6.02 ppm, 302-2533ppm and 184-1012ppb in slurry, respectively.

   
 A) GHGs collection chamber for aquaculture  B) Collection of gases from shrimp culture pond





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