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Quantitative Data Analysis
Table 6-12 Internal Standards Column Fields (Continued)
Field
Definition
IS Concentration
The known concentration of the internal standard, this
applies to standard and quality control sample types.
Zeroes are displayed for solvent, blank, and double blank
sample types; N/A is displayed for unknowns.
IS Retention Time
The chromatographic retention time as determined by the
software.
IS Expected Retention Time
The retention time of the representative sample. Taken
from the quantitation method.
IS Retention Time Window
The retention time window as specified in the quantitation
method.
IS Centroid Location
The intensity-weighted average retention time for the
analyte. The peak areas up to and after this time are
identified.
IS Start Scan
The cycle number associated with the period/experiment
combination where the peak begins.
IS Start Time
The time associated with the period/experiment
combination where the peak begins.
IS Stop Scan
The cycle number associated with the period/experiment
combination where the peak ends.
IS Stop Time
The time associated with the period/experiment
combination where the peak ends.
IS Integration Type
The method by which the baseline was found and
integrated when the peak was found. The types are:
manual, automatic (Baseline-to-Baseline, Valley,
Exponential Skim, and Exponential Child).
IS Signal to Noise
The signal-to-noise ratio of the peak.
IS Peak Width
The ratio of the peak height to its width.
IS UV Range
The UV range of the internal standard.
IS UV Channel
The UV channel of the internal standard.
IS Peak Width at 50 Percent (min.) A read-only column displaying the peak width at 50% of
peak height.
IS Baseline Slope (%/min.)
A read-only column displaying the slope of the baseline.
IS Peak Asymmetry
A read-only column displaying the peak asymmetry which
is calculated by the following formula:
[(Peak End Time) – (Retention Time)] / [(Retention Time) –
(Peak Start Time)]
Values near 1.0 indicate symmetric peaks, values greater
than 1.0 indicate tailing peaks, and values less than 1.0
indicate fronting peaks.
IS Processing Alg
Advanced User Guide
Release Date: March 2012
A read-only column displaying the processing algorithm
used.
Analyst® 1.6.1 Software
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