Analytical parameters

analytical_parameters

This table documents the reference materials and standards used during the analysis of samples

Analytical parameters identifier

analytical_parameters_id

This field contains the unique identifier for the set of analytical parameters associated with a specific analysis.

Type	Required	Table
identifier	yes	organic_measures, mineral_measures, radiocarbon_measures, amino_acid_measures, analytical_parameters

Standard

standard

This field records the name or type of standard used during the analytical run. The standard refers to a reference material or known benchmark used to calibrate the equipment or validate the accuracy of the measurements taken.

Type	Required	Table
string	no	analytical_parameters

Known value

known_value

This field contains the expected or known value of the standard being used. This value serves as the reference against which the measured results are compared to assess the accuracy and reliability of the analytical process.

Type	Required	Table
decimal	no	analytical_parameters

Measured proxy

measured_proxy

This field specifies the element or isotope proxy that was measured during the analytical run. Examples include isotopic measurements such as δ13C, δ34S, δ18O, etc. This field indicates the specific proxy being analyzed.

Type	Required	Table
string	no	analytical_parameters

Allowed Values:

• δ13C
• δ15N
• δ34S
• δ13C carbonate
• δ18O carbonate
• δ18O phosphate
• δ18O total
• 87Sr/86Sr
• δ88Sr
• 143Nd/144Nd

Measured value

measured_value

This field records the actual value obtained for the measured proxy during the analytical run. It represents the experimental result and is compared against the known value of the standard to evaluate the success of the measurement.

Type	Required	Table
decimal	no	analytical_parameters

Measured uncertainty

measured_uncertainty

This field represents the uncertainty associated with the measured value. Expressed to one decimal point, it indicates the range or degree of variability in the measurement, reflecting how confident the researcher is in the accuracy of the measured result.

Type	Required	Table
decimal	no	analytical_parameters

Measured uncertainty type

measured_uncertainty_type

This field specifies the type of statistical uncertainty associated with the measured value. Accepted values are “sd”, “2sd”, “se” or “2se”. This clarifies the basis of the uncertainty measurement, helping to interpret the level of confidence and precision in the reported value.

Type	Required	Validations	Table
string	no	Lowercase: yes	analytical_parameters

Allowed Values:

• sd
• 2sd
• se
• 2se