Glossary#
This glossary contains all the variables used in TUCAVOC. The names of the variables correspond to names in Python.
- abs_u_cal#
\(u_{\mathrm{calib}}\) [pmol/mol] : Certified uncertainty of the RGM amount fraction
Includes the possible drift of the RGM. Please note that the RGM amount fraction is generally given with an expanded uncertainty having a coverage factor of k=2. The standard uncertainty \(u_{\mathrm{calib}}\) is thus half of the expanded uncertainty.
- area_blank#
\(A_{\mathrm{blank}}\) [area] : Possible blank area value determined in zero gas measurements
In few cases, the blank values obtained in zero gas measurements can be significantly higher than the determined peak areas yielding negative amount fractions according to (1) and (4). Then the zero gas procedure and further potential sources of blank values have to be checked and appropriate uncertainties of the blank values have to be estimated. See also blank_conc_preset .
- area_calib#
\(A_{\mathrm{calib}}\) [area] : Peak area of calibration gas measurement
- area_sample#
\(A_{\mathrm{sample}}\) [area] : Peak area of sample measurement
- blank_conc_preset#
\(\chi _{\mathrm{blank}}\) [pmol/mol] : Blank amount fraction
Amount fraction of the blank. A constant value that can be assigned. TUCAVOC will then retrieve the blank area value using Equations (5) or (6). This helps when the value of the blank is known but was not measured in the sample.
- calib_factor#
\(f_{\mathrm{calib}}\) [-] : Calibration Factor
Calculated in: (2)
The calibration factor is useful for simplfying the equations.
- carbon_number#
\(C_{\mathrm{num}}\) [-] : Carbon number
Number of C atoms in the molecule
- carbon_response_factor#
\(C_{\mathrm{resp}}\) [-] : Carbon Response Factor (CRF)
Calculated in: (3)
- conc#
\(\chi _{\mathrm{sample}}\) [pmol/mol] : Concentration or Amount fraction of a substance in a sample
Analogous to conc_sample
- conc_calib#
\(\chi _{\mathrm{calib}}\) [pmol/mol] : Certified amount fraction of calibration gas
The amount fraction present in the RGM.
- conc_sample#
\(\chi _{\mathrm{sample}}\) [pmol/mol] : Amount fraction of a substance in a sample
- conc_std_blank#
\(\sigma _{\mathrm{blank}}\) [pmol/mol] : standard deviation of the amount fraction of a serie of blank runs
Standard deviation of consecutive blank runs. This works only when blanks are read from data files. If blanks are specified by the user the current implementation assumes uncertainty is 0.
- detection_limit#
\(\mathrm{LOD}\) [pmol/mol] : Detection Limit
The detection limit is the lowest amount fraction that can be measured with a given instrument.
- effective_carbon_number_contribution#
\(y\) [-] : ECN contribution
The ECN contribution, i.e. 1.0 for carbon in aliphatic and aromatic bonds, 0.95 per C in olefinic bonds, 1.3 in acetylenic bonds (Sternberg et al., 1962).
- error_systematic_instrument#
\(u_{\mathrm{instrument}}\) [%] : Systematic Instrument Error
Relative error due to the instrument.
- flag#
A Flag value
The flag value attributed. See Flagging.
- general_mean_carbon_response_factor#
\(\overline{C}_{\mathrm{resp},\mathrm{general}}\) [-] : General Mean Carbon Response Factor (CRF)
Same as mean_carbon_response_factor but including only substances selected for the general CRF.
- group_mean_carbon_response_factor#
\(\overline{C}_{\mathrm{resp},\mathrm{group}}\) [-] : Mean CRF of a group
Same as mean_carbon_response_factor but including only substances from a group.
- ignore_n_first_blanks#
Number of starting blank runs to be ignored.
Often the first blank samples have residuals of the substances that were measured just before. This means that the blank area might be larger in the first blank measurements. As this could influence the blank value, this parameter allows to select how many of the starting blank runs should be ignored in the calculation.
- mean_carbon_response_factor#
\(\overline{C}_{\mathrm{resp}}\) [-] : Mean carbon response factor
Determined from selected substances in the RGM measurements averaging CRF for those substances.
- rel_error_conc_blank#
\(\sigma _{\mathrm{conc}blank}\) [%] : Relative error of the blanks concentration.
Relative error of the blank concentration given by the user. See blank_conc_preset .
- sigma_rel_series#
\(\sigma^{\mathrm{rel}}_{\mathrm{series}}\) [%] : relative standard deviation of calibrations
At least 6 individual measurements of target gas orworking standard over the considered interval are recommended. However TUCAVOC will also work with less than that.
- u_blank#
\(u\left(\chi _{\mathrm{Blank}}\right)\) [pmol/mol] : Unkonwn. Please implement.
Explained in: Uncertainty of the Blank
- u_calibration#
\(u\left(\chi _{\mathrm{Calibration}}\right)\) [pmol/mol] : Standard uncertainty of the calibration.
Explained in: Uncertainty of the Calibration
- u_further_instrumental_problems#
\(u\left(\chi _{\mathrm{Further\ Instrumental\ Problems}}\right)\) [pmol/mol] : Standard uncertainty associated a further instrumental problems, such as the systematic instrument error.
Explained in: Uncertainty of the Further Instrumental Problems
- u_instrument#
\(u\left(\chi _{\mathrm{Instrument}}\right)\) [pmol/mol] : Combined uncertainty of the instrument, which includes the standard uncertainties of the peak integration, linearity and further instrumental problems.
Explained in: Uncertainty of the Instrument
- u_linearity#
\(u\left(\chi _{\mathrm{Linearity}}\right)\) [pmol/mol] : Standard uncertainty of the system linearity.
Explained in: Uncertainty of the Linearity
- u_peak_area_integ_calib#
\(\frac{u\left(A_{\mathrm{int,}calib}\right)}{A_{\mathrm{calib}}}\) [%] : Uncertainty from peak integration in the calibration
Standard relative uncertainty of the peak integration in the calibration.
- u_peak_area_integ_sample#
\(\frac{u\left(A_{\mathrm{int,}sample}\right)}{A_{\mathrm{sample}}}\) [%] : Uncertainty from peak integration in the measurement
Standard relative uncertainty of the peak integration in the measurement.
- u_peak_integration#
\(u\left(\chi _{\mathrm{Peak\ Integration}}\right)\) [pmol/mol] : Combined uncertainty of the peak integration
Explained in: Uncertainty of the Peak Integration
- u_precision#
\(u\left(\chi _{\mathrm{Precision}}\right)\) [pmol/mol] : Standard uncertainty due to the precision.
Explained in: Uncertainty linked to the reproducibility of the measurement method (Precision)
- u_rel_combined#
\(\frac{u\left(\chi _{\mathrm{sample}}\right)^{2}}{\chi _{\mathrm{sample}}}\) [%] : Relative combined uncertainty of the sample measurement.
The combined uncertainty of the sample measurement divided by the amount fraction of the sample.
- u_rel_expanded#
\(2*\frac{u\left(\chi _{\mathrm{sample}}\right)^{2}}{\chi _{\mathrm{sample}}}\) [%] : Relative expanded uncertainty of the sample measurement.
The combined uncertainty of the sample measurement multiplied by the factor coverage (k = 2) and divided by the amount fraction of the sample.
- u_sampling#
\(u\left(\chi _{\mathrm{Sampling}}\right)\) [pmol/mol] : Standard uncertainty of the sampling techniques.
Explained in: Uncertainty of the sampling method
- u_volume#
\(u\left(\chi _{\mathrm{Volume}}\right)\) [pmol/mol] : Combined uncertainty due to the difference between sampling and calibration volumes.
Explained in: Uncertainty of the Volume
- uncertainty_due_to_linearity#
\(u_{\mathrm{linearity}}\) [pmol/mol] : Uncertainty from non-linearity
- uncertainty_sampling_volume_accuracy#
\(u_{\mathrm{sampling}}\) [pmol/mol] : Uncertainty from sampling volume accuracy
- use_for_general_crf#
Use in the General Mean CRF calculation
Whether the substance should be used to compute the general_mean_carbon_response_factor .
- volume_calib#
\(V_{\mathrm{calib}}\) [ml] : Volume of calibration gas samples
- volume_sample#
\(V_{\mathrm{sample}}\) [ml] : Volume of measured samples
- volume_uncertainty_calib#
\(u\left(V_{\mathrm{calib}}\right)\) [ml] : Uncertainty of the calibration volume
- volume_uncertainty_sample#
\(u\left(V_{\mathrm{sample}}\right)\) [ml] : Uncertainty of the measured sample volume