M00001677
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ISO 11843-7 1st Edition, June 1, 2012 Capability of detection - Part 7: Methodology based on stochastic properties of instrumental noise
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Availability date: 07/13/2021
Description / Abstract:
Background noise exists ubiquitously in analytical instruments,
whether or not a sample is applied to the instrument. This part of
ISO 11843 is concerned with mathematical methodologies for
estimating the minimum detectable value in case that the most
predominant source of measurement uncertainty is background noise.
The minimum detectable value can directly and mathematically be
derived from the stochastic characteristics of the background
noise.
It specifies basic methods to
— extract the stochastic properties of the background noise,
— use the stochastic properties to estimate the standard
deviation (SD) or coefficient of variation (CV) of the response
variable, and
— calculate the minimum detectable value based on the SD or CV
obtained above.
The methods described in this part of ISO 11843 are useful for
checking the detection of a certain substance by various types of
measurement equipment in which the background noise of the
instrumental output predominates over the other sources of
measurement uncertainty. Feasible choices are visible and
ultraviolet absorption spectrometry, atomic absorption
spectrometry, atomic fluorescence spectrometry, luminescence
spectrometry, liquid chromatography and gas chromatography.