Inorganic carbon (coulometer)

Inorganic carbon (carbonate) is determined by coulometry, which uses a photodetection cell to measure carbon dioxide evolved during sample acidification. Report includes percent inorganic carbon and calcium carbonate.

Data File format

    Exp: expedition number
    Site: site number
    Hole: hole number
    Core: core number
    Type: type indicates the coring tool used to recover the core (typical types are F, H, R, X).
    Sect: section number
    A/W: archive (A) or working (W) section half.
    Top offset (cm): position of the upper edge of the sample, measured relative to the top of the section.
    Bottom offset (cm): position of the lower edge of the sample, measured relative to the top of the section.
    Top depth CSF-A (m): location of the upper edge of the sample expressed relative to the top of the hole.
    Bottom depth CSF-A (m): location of the lower edge of the sample expressed relative to the top of the hole.
    Top depth [other] (m): location of the upper edge of the sample expressed relative to the top of the hole. The location is presented in a scale selected by the science party or the report user.
    Bottom depth [other] (m): location of the lower edge of the sample expressed relative to the top of the hole. The location is presented in a scale selected by the science party or the report user.
    Inorganic carbon (wt%): percentage of carbon found in sample, calculated from carbon mass and (weighed) mass.
    Calcium carbonate (wt%): percentage of calcium carbonate found in sample, calculated from carbon percentage and assumes all carbonate is calcium carbonate (CaCO3 = IC x 8.33).
    Carbon mass (µg): mass of carbon found in sample, measured directly by coulometry.
    Mass (mg): mass of the sample weighed out for experiment.
    Timestamp (UTC): time file was uploaded, which is typically a few minutes to hours after data were acquired.
    Text ID: automatically generated unique database identifier for a sample, visible on printed labels.
    Test No: unique number associated with the instrument measurement steps that produced these data. 
    Sample comments: observations recorded about the sample itself.
    Test comments: observations about a measurement or the measurement process; some measurement observations may be under Result comments.
    Result comments: observations about a measurement or the measurement process; some measurement observations may be under Test comments.