¹⁴C Dating of Groundwater Containing Microbial CH₄

Major Factors Controlling Arsenic Occurrence in the Groundwater and Sediments of the Chianan Coastal Plain, SW Taiwan

“…Concentrations of SO 4 2-and Cl -were determined by ion chromatograph with a Dionex-120 ® . About 50 liters of each water sample were collected for precipitating dissolved inorganic carbon (DIC) for 14 C dating using the procedures described by Hackley et al (1992) and Liu (1995). The uncertainties for As and SO 4 2-are 3%, and that for Cl -is 2%.…”

Origin of methane in high-arsenic groundwater of Taiwan – Evidence from stable isotope analyses and radiocarbon dating

“…The CH 4 from CN-08(III) is significantly older than its coexisting DIC and the CH 4 from the underlying CN-08 (IV). Hackley et al (1992) also noted that CH 4 in their study is generally older than DIC. They interpreted this as resulting from the fact that CO 2 from degradation of sedimentary organic matter can react to form CH 4 before equilibration with DIC.…”

“…The water samples were ensured to be fresh and representative by pumping each well long enough to replace the free-standing water in the casing before taking samples. About 50 l of each water sample was collected from these wells for precipitation of dissolved inorganic carbon (DIC) for 14 C dating using the procedures described previously by Hackley et al (1992) and Liu (1995a). Collection of exsolved gases for gas isotopic analyses was carried out using inverted glass bottles submerged in sample water at the discharge outlet of the flow chamber.…”

Tritium Concentrations and Radiocarbon Ages of Gushing Groundwater from Hsuehshan Tunnel, Northern Taiwan

“…The sampling and analytical methods used in this study are similar to those of Hackley et al (1992) and Liu (1995). Two types of water samples were collected from each gushing site: a 45-liter sample for 14 C dating and a 1-liter sample for 3 H ( t 1/2 =12 43 .…”