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A Comprehensive Literature Review on the Applicability of Free and Dissolved Gas Sampling for Baseline Water Well Testing
Trevor Hirsche
其他書名
Final Report
出版Alberta Environment, 2009
主題Nature / Natural ResourcesTechnology & Engineering / Mining
ISBN07785811449780778581147
URLhttp://books.google.com.hk/books?id=ce4ZQwAACAAJ&hl=&source=gbs_api
註釋The friction caused in the restrictor leads to a loss of hydrostatic pressure acting on the sample to the point where the total gas pressure exceeds the hydrostatic pressure in the tube. [...] As water is pumped through the sampler and the headspace gradually fills with exsolved gas, the end of the cane-shaped tube in the Oak sampler will be exposed to free gas earlier than is the case with the Maxxam sampler with its shorter cane-shaped tube. [...] Once equilibrium is reached between the dissolved gases outside of the sampler and the gases inside such that no further diffusion will occur, the dissolved gas concentration in the water can be calculated from the concentration of the target gas in the sampler using Henry's Law (Sanford et al., 1996; Jacinthe and Groffman, 2001): Cg = CwHcc Diss olved and Free Gas Sampling for Baseline Water Well [...] To collect a sample, water in the sampled well is allowed to flow into the sampler, where equilibrium is eventually reached between the gas inside the sampler and the dissolved gas in the groundwater over a period of several hours. [...] After equilibrium is achieved between the gas in the sample-holder and the dissolved gas in the groundwater, the sampler is removed from the well and the stopcock between the sample-holder and the PTFE tube is closed to trap the gas sample.