{
  "accessed": "2026-10-19",
  "verified": "2026-11-06",
  "actual_experiment": {
    "source_doi": "10.1515/pac-2020-0202",
    "source_url": "https://www.degruyterbrill.com/document/doi/10.1515/pac-2020-0202/html#j_pac-2020-0202_tab_007",
    "calibration_table_url": "https://www.degruyterbrill.com/document/doi/10.1515/pac-2020-0202/html#j_pac-2020-0202_tab_003",
    "tables": [
      3,
      7
    ],
    "data_level": "Published processed and rounded pHT values, not raw electrode voltages.",
    "temperature_C": 25,
    "practical_salinity": 35,
    "scale": "total hydrogen ion concentration scale, mol per kg solution",
    "calibration_buffers": [
      {
        "buffer": 1,
        "pHT": "7.622",
        "U": "0.005"
      },
      {
        "buffer": 3,
        "pHT": "8.209",
        "U": "0.005"
      }
    ],
    "control_buffer": 2,
    "reference_pHT": "8.101",
    "reference_U": "0.005",
    "coverage_factor": 2,
    "results": [
      {
        "electrode": "Unitrode 1",
        "pHT": "8.10",
        "U": "0.01"
      },
      {
        "electrode": "Unitrode 2",
        "pHT": "8.10",
        "U": "0.01"
      },
      {
        "electrode": "Primatrode 1",
        "pHT": "8.09",
        "U": "0.01"
      },
      {
        "electrode": "Primatrode 2",
        "pHT": "8.10",
        "U": "0.01"
      }
    ],
    "rounding_note": "Differences calculated from displayed rounded values do not increase measurement resolution.",
    "independence": "Buffer 2 was not used for calibration. All three buffers share artificial seawater matrix and reference assignment methodology."
  },
  "handbook_illustration": {
    "source_id": "WEB_NOAA_Dickson_et_al_2007_prirucka_standardnich_mericic_9661bd2a",
    "source_url": "https://www.ncei.noaa.gov/access/ocean-carbon-acidification-data-system/oceans/Handbook_2007/Guide_all_in_one.pdf#page=118",
    "location": "SOP 6a, version 3.0, 12 October 2007, section 8.3, page 6 of 7",
    "data_level": "Worked example in a methodological guide. No actual ocean sample identification is supplied.",
    "temperature_C": 25,
    "practical_salinity": 35,
    "scale": "total hydrogen ion concentration scale, mol per kg solution",
    "pHT_TRIS": "8.0936",
    "pHT_AMP": "6.7866",
    "E_TRIS_mV": "-72.4",
    "E_AMP_mV": "4.9",
    "E_sample_mV": "-67.0",
    "ideal_slope_mV_per_pH": "59.16"
  }
}