18 research outputs found
Towards properly controlled analytical measurement methods
It is of great practical importance to develop simple methods for the
automatic detection ofthe controlled state of the analytical method
being applied. The key point is to find quantities that greatly affect
the quality of the analytical results and that can be easily estimated
during the measurement process from the measured data. The
signal-to-noise ratio has proved to be such a quantity in gas
chromatographic methods. The statistical properties of the
estimation of the signal-to-noise ratio from gas chromatographic
data have been investigated. The suggested practical method for
estimating the signal-to-noise ratio proved to be biased from a
mathematical statistical point of view, but the bias is usually not
greater than 10%. It has been shown by practical examples that the
signal-to-noise ratio affects the quality of the analytical results and
it is easy to estimate its value from practical data
Investigation of the steady state measurement process
Based on the role of steady state concept in the model of analytical chemical measurement and deduction, the definition of ‘practically sleady slate’ (PSS) has been inlroduced. The defnition does not require the process to be in steady state in a strictly mathematical sense. In order to fulfil the requiremenls of ‘practically steady state’ the random error and the syslematic error must vary within a suitable limit, and the expected fgure for the measured value must be within a specified range
Towards properly controlled analytical measurement methods
It is o f great practical importance to develop simple methods for the automatic detection of the controlled state of the analytical method being applied. The key point is to find quantities that greatly affect the quality of the analytical results and that can be easily estimated during the measurement process from the measured data. The signal-to-noise ratio has proved to be such a quantity in gas chromatographic methods. The statistical properties of the estimation of the signal-to-noise ratio from gas chromatographic data have been investigated. The suggested practical method for estimating the signal-to-noise ratio proved to be biased from a mathematical statistical point of view, but the bias is usually not greater than 10%. It has been shown by practical examples that the signal-to-noise ratio affects the quality of the analytical results and it is easy to estimate its value from practical data