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** Linear calibration function calculation **

** Method Characteristic Parameters of a Linear Calibration Function **

In case of a linear calibration function (see Chap. 6), the sensitivity becomes SAA = AyA/AxA and corresponds to the slope b of the calibration straight line see Fig. 7.4a. If the calibration function is a curved line, then the sensitivity will vary according to the analyte amount or concentration as Fig. 7.4b shows. [Pg.211]

In any case, linear calibration functions should be obtained over two decades with correlation coefficients (R ) better than 0.999 (Figure 26.13). It did not make a difference, if calibration solution were prepared on matrix extracts [28]. [Pg.587]

In most cases a linear calibration function can be used, as discussed earlier. It [Pg.84]

In most cases, a linear calibration function can be used (see Section 21.3.1). If c,- is the concentration of a standard sample and. v, is the radiation intensity, absorption, or ion current for the element to be determined, the linear regression has the form [Pg.658]

For chemical measurements with a linear calibration function, traceability of results can be formally established without great expenditure if the calibration is based on suitable reference standards and the linear regression is performed as shown above and (statistically) validated. The use of reference materials as samples make it possible to establish the traceability of a new analysis protocol by using an existing analysis method. [Pg.258]

Part 1 Statistical evaluation of the linear calibration function [Pg.186]

Method Characteristic Parameters of a Linear Calibration Function [Pg.948]

Computation Effects Selection of the calibration model will influence results. For example, fitting a linear calibration function to data that are non-linear will result in increased uncertainty in values predicted by using the calibration function. [Pg.165]

The coefficients a are calculated by regression procedures. Alternatively, different linear calibration functions may be used for different concentration ranges. [Pg.659]

Suitable calibration of instruments used is a fundamental necessity, and it is rarely performed in an appropriate way. Most often, linear calibration functions are regarded [Pg.102]

ISO 8466-1 1990 - Calibration and evaluation of analytical methods and estimation of performance characteristics - Part 1 Statistical evaluation of the linear calibration function [Pg.200]

The measure for sensitivity results from the change in the measuring value when changing concentration. While in a linear calibration function sensitivity corresponds to the regression coefficient b, in a curved calibration function it depends on the respective concentration value and, therefore, corresponds to the first derivation of the calibration function [Pg.951]

ISO 8466-1, Water Quality - Calibration and Evaluation of Analytical Methods and Estimation of Performance Characteristics- Part 1 the Statistical Evaluation of the Linear Calibration Function, Geneva, ISO, 2001. [Pg.160]

Establishing a calibration function with one single broad distributed sample is an alternative to traditional peak postion calibration of SEC systems with a set of narrow distributed standards. An obvious advantage of this technique is time for peak position calibration elution profiles for the set of standards need to be determined for broad standard calibration the elution profile of one sample needs to be determined only. Establishing a linear calibration function with a broad distributed standard includes startup information [M (true), Mn(true)] and an iterative (repeat.. . until) algorithm [Pg.463]

For the practical determination of the detection criteria, the standard deviation Syo of the blank value Jq or the standard deviation of the intercept a of the linear calibration function is used, where the standard deviation should be calculated from at least = 6 measuring values. The detection criteria is then regarded as the upper limit of the blank value scatter [Pg.962]

Abstract Based on the new draft of the EURACHEM/CITAC Guide Traceability in Chemical Measurement , this publication describes how traceability can be achieved for chemical measurements using a linear calibration function. Traceability can be accomplished without larger expenditure, if the measurement is calibrated on the basis of appropriate reference standards and the linear regression employed is selected and [Pg.253]

** Linear calibration function calculation **

** Method Characteristic Parameters of a Linear Calibration Function **

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