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Tag Archives: indeterminate error
Methods for Improving Precision in Absorbance Measurements
As shown here, the relative uncertainty in determining absorbance (and thus in determining concentration) is greater at very high and very low absorbances (that is, when very little or almost all of the source radiation reaches the detector. One way … Continue reading
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Tagged absorbance, indeterminate error, precision, spectroscopy, uncertainty
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Uncertainty in Measurement of Absorbance
In absorption spectroscopy, precision is limited by indeterminate errors—primarily instrumental noise—introduced when measuring absorbance. Precision is generally worse for low absorbances where P0≈ PT, and for high absorbances when PT approaches 0. We might expect, therefore, that precision will vary … Continue reading
Importance of Sampling to Overall Uncertainty in an Analysis
The overall variance in an analysis, s2, is the sum of the variances arising from the method, (smeth)2, and the variance due to sampling, (ssamp)2. s2 = (smeth)2 + (ssamp)2 The blue curve in this figure shows the method’s contribution to the … Continue reading
Indeterminate Errors and Noise
Indeterminate errors are random in nature and affect the reproducibility and repeatability of analytical measurements. We can assign indeterminate errors to several sources, including collecting samples, manipulating samples during the analysis, and making measurements. The data shown here, for example, show … Continue reading