Research Article
Active Microbial Communities Inhabit Sulphate-Methane Interphase in Deep Bedrock Fracture Fluids in Olkiluoto, Finland
Table 2
Geochemical analysis methods and the detection limit of each assay used in this study. The data were obtained from Posiva Oy.
| | Parameter | Unit | Method | Detection limit |
| | pH | | pH meter, ISO-10532 | | | EC | (mS m−1) | Conductivity analyzer, SFS-EN-27888 | 5 | | NPOC | (mg L−1) | SFS-EN 1484 | TC: 0.6
IC: 0.3 l
TOC: 0.3 | | TDS | (mg L−1) | | | | Alk | (meq L−1) | Titration with HCl | 0.05 | | (mg L−1) | IC, conductivity detector | 0.1 | | S2− | (mg L−1) | Spectrophotometry | 0.1 | | (mg L−1) | FIA method, SFS-EN ISO11905-1 | 0.05 | | (mg L−1) | Spectrophotometry, SFS 3032 | | | Fe2+ | (mg L−1) | Spectrophotometry | 0.01 | | Na2+ | (mg L−1) | 2007: FAAS, SFS3017, 3044
2008: ICP-OES | 5
0.5 | | K+ | (mg L−1) | 2007: FAAS, SFS3017, 3044
2008: ICP-OES | 0.31
0.5 | | Ca2+ | (mg L−1) | 2007: FAAS, SFS3017, 3044
2008: ICP-OES | 0.02
0.1 | | Mg2+ | (mg L−1) | 2007: FAAS, SFS3018
2008: ICP-OES | 0.15
0.02 | | Cl− | (mg L−1) | Titration | 5 | | CH4 | (mL L−1 gas) | Gas chromatography | 1 L L−1 gas |
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