CN117763265A - Standard substance evaluation method - Google Patents
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- CN117763265A CN117763265A CN202311835061.5A CN202311835061A CN117763265A CN 117763265 A CN117763265 A CN 117763265A CN 202311835061 A CN202311835061 A CN 202311835061A CN 117763265 A CN117763265 A CN 117763265A
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- 239000000126 substance Substances 0.000 title claims abstract description 231
- 238000011156 evaluation Methods 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 claims abstract description 97
- 238000012545 processing Methods 0.000 claims abstract description 14
- 238000012937 correction Methods 0.000 claims description 37
- 238000005259 measurement Methods 0.000 claims description 30
- 238000002474 experimental method Methods 0.000 claims description 13
- 238000004364 calculation method Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000011088 calibration curve Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000004750 isotope dilution mass spectroscopy Methods 0.000 description 1
- 238000013507 mapping Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000011158 quantitative evaluation Methods 0.000 description 1
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- 238000013097 stability assessment Methods 0.000 description 1
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Abstract
The disclosure relates to the technical field of metering methods, and provides a standard substance evaluation method which comprises the steps of re-determining a second standard substance based on a first standard substance; calculating a first uncertainty of the re-setting process according to a predetermined rule; calculating a second uncertainty introduced by the first standard substance, correcting a third uncertainty introduced by a measuring system, and performing sample processing on the second standard substance to obtain a fourth uncertainty; obtaining a fifth uncertainty in the re-thresholding process based on the first uncertainty, the second uncertainty, the third uncertainty, and the fourth uncertainty; calculating a re-calibration result of the second standard substance according to a fifth uncertainty of the re-calibration process and the re-calibration value of the second standard substance; and evaluating the certificate value of the second standard substance based on the re-setting value result of the second standard substance. Through the technical scheme, the problem of poor accuracy of the standard substance evaluation method in the prior art is solved.
Description
Technical Field
The disclosure relates to the technical field of metering methods, and in particular relates to a standard substance evaluation method.
Background
The standard substance is a material or substance used to calibrate a device, evaluate a measurement method, or assign a value to a material, and is an important "gauge" in the analytical measurement industry, bearing important responsibility for magnitude transfer. The standard substance is used as a measurement reference standard, is an indispensable tool for measurement process control and measurement result evaluation, and is a substance foundation and guarantee for establishing a consistent and comparable global measurement mutual recognition system. Therefore, a method capable of accurately evaluating the amount of a standard substance is demanded.
Disclosure of Invention
The present disclosure proposes a standard substance evaluation method, which solves the problem of poor accuracy of the standard substance evaluation method in the related art.
The technical scheme of the present disclosure is as follows: comprising the following steps: resetting the second standard substance based on the first standard substance to obtain a resetting value of the second standard substance;
calculating a first uncertainty of the re-setting process according to a predetermined rule;
calculating a second uncertainty introduced by the first standard substance, correcting a third uncertainty introduced by a measuring system, and performing sample processing on the second standard substance to obtain a fourth uncertainty; the measuring system is used in the resetting process;
obtaining a fifth uncertainty in the re-thresholding process based on the first uncertainty, the second uncertainty, the third uncertainty, and the fourth uncertainty;
calculating a re-calibration result of the second standard substance according to a fifth uncertainty of the re-calibration process and the re-calibration value of the second standard substance;
and evaluating the certificate value of the second standard substance based on the re-setting value result of the second standard substance.
Further, deriving a fifth uncertainty of the re-thresholding process from the first uncertainty, the second uncertainty, the third uncertainty, and the fourth uncertainty, comprising:
by passing throughCalculating the standard uncertainty of the re-valued process;
wherein,standard uncertainty representing the resetting process, < ->Representing a first uncertainty,/>A second degree of uncertainty is indicated and,u cal a third degree of uncertainty is indicated and,u treat representing a fourth uncertainty;
and determining the standard uncertainty of the re-valued process as a fifth uncertainty of the re-valued process.
Further, the fifth uncertainty in the process of obtaining the redefined value according to the first uncertainty, the second uncertainty, the third uncertainty and the fourth uncertainty further includes:
by passing through=k/>Calculating the expansion uncertainty of the re-setting process; wherein (1)>An expansion uncertainty representing a re-setting process, k representing a inclusion factor of the second standard substance;
and determining the expanded uncertainty of the re-valued process as a fifth uncertainty of the re-valued process.
Further, calculating a second uncertainty of the first standard comprises:
if the first standard substance comprises a standard substance, calculating the second uncertainty based on the inclusion factor of the first standard substance and the standard uncertainty of the first standard substance;
if the first standard substance includes a plurality of standard substances, calculating the second uncertainty based on the inclusion factor of the target standard substance and the standard uncertainty of the target standard substance; the target standard substance is a first standard substance with the smallest difference between the magnitude of the target standard substance and the magnitude of the second standard substance among the plurality of first standard substances.
Further, calculating a third uncertainty introduced by the measurement system correction includes:
if the measurement system employs linear correction, then byCalculating a third uncertaintyu cal ；
Wherein,u cal a third degree of uncertainty is indicated and,，ythe correction value is indicated and is indicated,xrepresenting correction valuesyThe corresponding measured value is used to determine,pthe number of measurements of the sample is indicated,nindicating the total number of measurements for correction of the measuring system, +.>Representing the average value of all the second standard substance values for correction;ithe number of measurements at each correction point of the correction curve is shown.
Further, calculating a fourth uncertainty introduced in sample processing of the second standard, comprising:
and obtaining the fourth uncertainty according to the historical data.
Further, calculating a re-thresholding result of the second standard substance based on a fifth uncertainty of the re-thresholding process and a magnitude of the second standard substance, comprising:
by passing throughCalculating a re-valued result of the second standard substance;
wherein,indicating the re-calibration result of the second standard substance, < >>Indicating the magnitude of the redefined value of the second standard substance,/->Fifth non-representation of the re-thresholding processAnd determining degree.
Further, evaluating the certification value of the second standard substance based on the re-setting result of the second standard substance includes:
by passing throughCalculating the magnitude accuracy of the second standard substance;
wherein,representing the accuracy of the magnitude of the second standard substance, +.>Certificate value representing the second standard substance, +.>Indicating the re-calibration result of the second standard substance, < >>Indicating the degree of uncertainty of the expansion of the second standard substance, < >>Representing an extended uncertainty of the re-setting process;
and evaluating the magnitude of the second standard substance based on the magnitude accuracy of the second standard substance.
Further, the method further comprises the following steps:
in the case of joint evaluation of the second standard substance by a plurality of experiments, the second standard substance was evaluated by doe=x j –x a Calculating the magnitude equivalence degree of the second standard substance;
wherein DoE represents the magnitude equivalent of the second standard substance,x j representing the magnitude of the redefined value obtained from any one experiment,x a representing the certification value of the second standard.
Further, the method further comprises the following steps:
in the case of joint evaluation of the second standard substance by multiple experiments, the method comprises
Calculating uncertainty of the magnitude equivalence degree;
wherein,represents an uncertainty in the magnitude equivalence,u j representation ofx j The degree of uncertainty of the corresponding one of the two,u a representation ofx a Corresponding uncertainty.
The working principle and the beneficial effects of the present disclosure are:
in the method, a second standard substance is a standard substance to be evaluated, the magnitude of the second standard substance is redefined by using other standard substances, namely a first standard substance, a fifth uncertainty in the redevelopment process is calculated, and a redevelopment result of the second standard substance is calculated according to the fifth uncertainty and the magnitude of the second standard substance; and then evaluating the magnitude of the second standard substance according to the re-determination result of the second standard substance.
The fifth uncertainty in the re-calibration process considers the influence of factors such as the first uncertainty, the second uncertainty introduced by the first standard substance, the third uncertainty introduced by the correction of the measurement system, the fourth uncertainty introduced by the sample treatment of the second standard substance, and the like, and is beneficial to the accurate evaluation of the standard substance.
Drawings
The present disclosure is described in further detail below with reference to the attached drawings and detailed description.
Fig. 1 is a flow chart of a standard substance evaluation method according to an embodiment of the disclosure.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system configurations, techniques, etc. in order to provide a thorough understanding of the disclosed embodiments. However, it will be apparent to one skilled in the art that the present disclosure may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present disclosure with unnecessary detail.
For the purposes of promoting an understanding of the principles and advantages of the disclosure, reference will now be made to the embodiments illustrated in the drawings.
Referring to fig. 1, fig. 1 is a flow chart of a standard substance evaluation method according to an embodiment of the disclosure, where the method includes:
s101: and re-determining the second standard substance based on the first standard substance to obtain a re-determined value of the second standard substance.
In the embodiment of the disclosure, the second standard substance is a standard substance to be evaluated, and the magnitude of the second standard substance is redefined by using other standard substances, that is, the first standard substance.
S102: a first uncertainty of the re-setting process is calculated according to a predetermined rule.
In the embodiments of the present disclosure, the first uncertainty is generally referred to as a class a assessment of uncertainty, and a specific assessment method thereof is referred to JJF 1343 (customization of standard substances and uniformity, stability assessment).
S103: calculating a second uncertainty introduced by the first standard substance, correcting a third uncertainty introduced by a measuring system, and performing sample processing on the second standard substance to obtain a fourth uncertainty; the measuring system is used for the resetting process.
In the embodiment of the disclosure, the second uncertainty is an uncertainty introduced by the first standard substance, and the uncertainty of the first standard substance, the calibration mode of the measurement system, the sample processing process and the like all affect a fifth uncertainty in the re-determination process. Accordingly, embodiments of the present disclosure separately calculate the uncertainty of the above-described influencing factors to determine the fifth uncertainty of the re-thresholding process.
S104: and obtaining a fifth uncertainty of the re-determination process according to the first uncertainty, the second uncertainty, the third uncertainty and the fourth uncertainty.
In the embodiment of the disclosure, the first uncertainty, the uncertainty of the first standard substance, the correction mode of the measurement system and the uncertainty of the sample processing process are comprehensively considered, and the fifth uncertainty of the re-determination process is obtained.
S105: and calculating a re-calibration result of the second standard substance according to the fifth uncertainty of the re-calibration process and the magnitude of the second standard substance.
In the embodiment of the disclosure, the magnitude of the second standard substance should be re-determined by using a value determining method or an authority method used when the magnitude of the standard substance is determined, and a re-determining result of the second standard substance may be obtained based on the re-determined magnitude of the second standard substance and the fifth uncertainty of the re-determining process.
S106: and evaluating the certificate value of the second standard substance based on the re-setting result of the second standard substance.
In an embodiment of the present disclosure, the certificate value of the second standard substance may be found from the certificate of the second standard substance. And carrying out quantitative calculation on the accuracy of the second standard substance according to the re-fixed value result of the second standard substance so as to realize accurate evaluation of the second standard substance.
It can be derived from the above that, in the present disclosure, the second standard substance is a standard substance to be evaluated, the magnitude of the second standard substance is redefined by using other standard substances, that is, the first standard substance, a fifth uncertainty in the redefined process is calculated, and a redefined result of the second standard substance is calculated according to the fifth uncertainty and the magnitude of the second standard substance; and then evaluating the certificate value of the second standard substance according to the re-determination result of the second standard substance.
The fifth uncertainty in the re-determination process considers the influence of factors such as the first uncertainty, the second uncertainty introduced by the first standard substance, the third uncertainty introduced by the correction of the measurement system, the fourth uncertainty introduced by the sample processing of the second standard substance, and the like, and is beneficial to the accurate evaluation of the standard substance.
In one embodiment of the present disclosure, deriving the fifth uncertainty of the re-thresholding process from the first uncertainty, the second uncertainty, the third uncertainty, and the fourth uncertainty comprises:
by passing throughCalculating the standard uncertainty of the re-valued process;
wherein,representing the standard uncertainty of the re-thresholding process,u 1 a first degree of uncertainty is indicated and,u RM a second degree of uncertainty is indicated and,u cal a third degree of uncertainty is indicated and,u treat representing a fourth uncertainty;
the standard uncertainty of the re-thresholding process described above is determined as the fifth uncertainty of the re-thresholding process.
In an embodiment of the disclosure, a specific implementation manner is provided, where the first uncertainty, the second uncertainty, the third uncertainty, and the fourth uncertainty are synthesized to obtain a fifth uncertainty in the redefined process.
In one embodiment of the present disclosure, the fifth uncertainty in the process of obtaining the redefined value according to the first uncertainty, the second uncertainty, the third uncertainty and the fourth uncertainty further includes:
by passing through=k/>Calculating the expansion uncertainty of the re-setting process; wherein (1)>An expansion uncertainty representing a re-setting process, k representing a inclusion factor of the second standard substance;
and determining the expanded uncertainty of the re-valued process as a fifth uncertainty of the re-valued process.
In the embodiment of the present disclosure, the extended uncertainty may be further calculated according to the standard uncertainty obtained in the above calculation process, and the extended uncertainty may be determined as the fifth uncertainty in the redetermining process, so as to determine the measurement result interval.
In one embodiment of the present disclosure, calculating the second uncertainty of the first standard includes:
if the first standard substance includes a standard substance, calculating the second uncertainty based on the inclusion factor of the first standard substance and the standard uncertainty of the first standard substance;
if the first standard substance includes a plurality of standard substances, calculating the second uncertainty based on the inclusion factor of the target standard substance and the standard uncertainty of the target standard substance; the target standard substance is a first standard substance having a smallest difference in the amount from the second standard substance among the plurality of first standard substances.
In the embodiment of the disclosure, when the second standard substance is fixed by single-point correction, that is, only one first standard substance is used, the inclusion factor given in the first standard substance certificate may be usedkMultiplying the standard uncertainty of the first standard substance to obtain a second uncertainty. Such as lack of inclusion factorskThe information of (2) can be uniformly distributed to obtain the inclusion factorskIs that。
When the second standard substance is fixed in a multipoint correction manner, that is, using a plurality of first standard substances, in general, the standard substance closest to the measurement result contributes most to the re-fixed result, and therefore, for simplicity, only the uncertainty of the first standard substance having a similar magnitude may be considered to be introduced into the uncertainty of the re-fixed result, that is, the uncertainty of the first standard substance having a magnitude that differs least from the magnitude of the second standard substance may be considered as the uncertainty of the first standard substance.
The plurality of first standard substances may be the same standard substance diluted to different concentrations or may be different standard substances.
In one embodiment of the present disclosure, calculating the third uncertainty introduced by the measurement system correction described above includes:
if the measurement system employs linear correction, then byCalculating a third uncertaintyu cal ；
Wherein,u cal a third degree of uncertainty is indicated and,，ythe correction value is indicated and is indicated,xrepresenting correction valuesyThe corresponding measured value is used to determine,pthe number of measurements of the sample is indicated,nindicating the total number of measurements for correction of the measuring system, +.>Representing the average value of all the second standard substance values for correction;ithe number of measurements at each correction point of the correction curve is shown.
In the embodiment of the disclosure, a corresponding uncertainty calculation method should be adopted according to the correction mode of the measurement system. For example:
1) If linear correction is used, the calculation is as follows:
the fitted curve is assumed to be:
wherein:
y-correction values;
x-a measurement value;
a-slope of curve;
bintercept of the curve.
Uncertainty introduced by the linear curve:
wherein:
wherein:
y-correction values;
xcorrection valueyCorresponding measured values;p-number of sample measurements;
n-calibrating the total number of measurements with standard substance;
-average of all calibration standard identification values;
i-number of measurements at each calibration point of the calibration curve.
If a linear correction curve is established by adopting two standard substances with single-point correction or similar magnitudes, uncertainty introduced by linear correction。
2) If isotope dilution mass spectrometry is used for assignment, uncertainty evaluation refers to JJF 1267.
In one embodiment of the present disclosure, calculating a fourth uncertainty introduced in sample processing of the second standard comprises:
the fourth uncertainty is obtained from the historical data.
In the embodiment of the disclosure, if the second standard substance needs to be processed in the process of determining the value, uncertainty possibly introduced in the sample processing process needs to be evaluatedu treat 。
The stability of the processing system, the uncertainty elimination measure to be taken, etc. should be taken into account comprehensively, the quantitative evaluation of the uncertainty component is performed based on historical data, for example, an empirical formula can be constructed based on the historical data, and the uncertainty can be performed based on the empirical formulau treat Quantization of (2)Evaluation, a mapping relation table can be established according to historical data, and uncertainty is obtained through a table look-up methodu treat Specific values of (2).
The fourth uncertainty can be eliminated to the greatest extent by using the same processing system, processing method and reagents for both the sample of the second standard and the first standard.
In one embodiment of the present disclosure, calculating the re-calibration result of the second standard substance according to the fifth uncertainty of the re-calibration process and the magnitude of the second standard substance includes:
by passing throughCalculating a re-calibration result of the second standard substance;
wherein,indicating the re-calibration result of the second standard substance, < >>Indicating the magnitude of the redefined value of the second standard substance,/->A fifth uncertainty representing the re-thresholding process.
In the embodiment of the disclosure, the magnitude of the second standard substance is combined with the re-calibration result of the second standard substance, so as to obtain the re-calibration result of the second standard substance.
In one embodiment of the present disclosure, evaluating the magnitude of the second standard substance based on the re-determination result of the second standard substance includes:
by passing throughCalculating the magnitude accuracy of the second standard substance;
wherein,representing the accuracy of the magnitude of the second standard substance, +.>Certificate value representing the second standard substance, +.>Indicating the re-calibration result of the second standard substance, < >>Indicating the degree of uncertainty of the expansion of the second standard substance, < >>Representing an extended uncertainty of the re-setting process;
and evaluating the magnitude of the second standard substance based on the magnitude accuracy of the second standard substance.
In an embodiment of the present disclosure, a method for processing a web,namely fifth uncertainty in the re-thresholding process>，/>Representing the expanded uncertainty of the second standard substance, multiplied by the inclusion factor based on the standard uncertainty on the second standard substance certificate. By calculating->And->And obtaining the magnitude accuracy of the second standard substance, and evaluating the second standard substance according to the magnitude accuracy. Specifically, the->Less than or equal to 1, the assignment result is consistent with the standard value given by the certificate, and the evaluation result is consistent; />>And 1, indicating that the assignment result is inconsistent with the standard value given by the certificate, and the evaluation result is inconsistent.
In one embodiment of the present disclosure, further comprising:
when the second standard substance is evaluated in combination by a plurality of experiments, the second standard substance is evaluated by doe=x j –x a Calculating the magnitude equivalence degree of the second standard substance;
wherein DoE represents the magnitude equivalent of the second standard substance,x j the re-determined value results obtained from any one experiment are shown,x a representing the certification value of the second standard.
In the embodiments of the present disclosure, the above-described second standard substance may be subjected to joint evaluation through a plurality of experiments. The plurality of experiments may be performed in the same laboratory, or may be performed in a plurality of laboratories.
When jointly evaluated by a plurality of laboratories, the degree of equivalence of the second standard substance value with each evaluation experiment result (re-valued result) may be evaluated by a method of calculating the degree of equivalence of the values.
Assume that the evaluation laboratory assigns a result ofx j Uncertainty of itu i . The second standard substance has a value ofx a Uncertainty of itu a . Then, the equivalence doe=x j -x a 。
In one embodiment of the present disclosure, further comprising:
in the case of performing the joint evaluation of the second standard substance by a plurality of experiments, the method comprises
Calculating uncertainty of the magnitude equivalent degree;
wherein,representing magnitude equivalenceThe degree of uncertainty of the degree of uncertainty,u j representation ofx j The degree of uncertainty of the corresponding one of the two,u a representation ofx a Corresponding uncertainty.
In the embodiment of the present disclosure, when the above-described second standard substance is subjected to joint evaluation through a plurality of experiments, the uncertainty of the magnitude equivalence degree may be further calculated. Taking a plurality of laboratory joint evaluations as an example, the calculation manner includes contribution of uncertainty of the single (laboratory) re-determination result and uncertainty of the second standard substance.
The foregoing description of the preferred embodiments of the present disclosure is not intended to limit the disclosure, but rather to cover any and all modifications, equivalents, improvements or alternatives falling within the spirit and principles of the present disclosure.
Claims (10)
1. The method for evaluating a standard substance is characterized by comprising the steps of: resetting the second standard substance based on the first standard substance to obtain a resetting value of the second standard substance;
calculating a first uncertainty of the re-setting process according to a predetermined rule;
calculating a second uncertainty introduced by the first standard substance, correcting a third uncertainty introduced by a measuring system, and performing sample processing on the second standard substance to obtain a fourth uncertainty; the measuring system is used in the resetting process;
obtaining a fifth uncertainty in the re-thresholding process based on the first uncertainty, the second uncertainty, the third uncertainty, and the fourth uncertainty;
calculating a re-calibration result of the second standard substance according to a fifth uncertainty of the re-calibration process and the re-calibration value of the second standard substance;
and evaluating the certificate value of the second standard substance based on the re-setting value result of the second standard substance.
2. The method of evaluating a standard substance according to claim 1, wherein obtaining a fifth uncertainty of the re-determination process based on the first uncertainty, the second uncertainty, the third uncertainty, and the fourth uncertainty, comprises:
by passing throughCalculating the standard uncertainty of the re-valued process;
wherein,representing the standard uncertainty of the re-thresholding process,u 1 a first degree of uncertainty is indicated and,u RM a second degree of uncertainty is indicated and,u cal a third degree of uncertainty is indicated and,u treat representing a fourth uncertainty;
and determining the standard uncertainty of the re-valued process as a fifth uncertainty of the re-valued process.
3. The method according to claim 2, wherein the obtaining the fifth uncertainty of the re-determination process based on the first uncertainty, the second uncertainty, the third uncertainty, and the fourth uncertainty, further comprises:
by passing through=k/>Calculating the expansion uncertainty of the re-setting process; wherein (1)>An expansion uncertainty representing a re-setting process, k representing a inclusion factor of the second standard substance;
and determining the expanded uncertainty of the re-valued process as a fifth uncertainty of the re-valued process.
4. The method of evaluating a standard substance according to claim 1, wherein calculating the second uncertainty of the first standard substance comprises:
if the first standard substance comprises a standard substance, calculating the second uncertainty based on the inclusion factor of the first standard substance and the standard uncertainty of the first standard substance;
if the first standard substance includes a plurality of standard substances, calculating the second uncertainty based on the inclusion factor of the target standard substance and the standard uncertainty of the target standard substance; the target standard substance is a first standard substance with the smallest difference between the magnitude of the target standard substance and the magnitude of the second standard substance among the plurality of first standard substances.
5. The method of evaluating a standard substance according to claim 1, wherein calculating the third uncertainty introduced by the measurement system correction includes:
if the measurement system employs linear correction, then byCalculating a third uncertaintyu cal ；
Wherein,u cal a third degree of uncertainty is indicated and, ，ythe correction value is indicated and is indicated,xrepresenting correction valuesyThe corresponding measured value is used to determine,pthe number of measurements of the sample is indicated,nindicating the total number of measurements for correction of the measuring system, +.>Representing the average value of all the second standard substance values for correction;ithe number of measurements at each correction point of the correction curve is shown.
6. The method for evaluating a standard substance according to claim 1, wherein calculating a fourth uncertainty introduced in sample processing of the second standard substance comprises:
and obtaining the fourth uncertainty according to the historical data.
7. The method according to claim 1, wherein calculating a re-calibration result of the second standard substance based on a fifth uncertainty of the re-calibration process and a re-calibration value of the second standard substance, comprises:
by passing throughCalculating a re-valued result of the second standard substance;
wherein,indicating the re-calibration result of the second standard substance, < >>Indicating the magnitude of the redefined value of the second standard substance,/->A fifth uncertainty representing the re-thresholding process.
8. The method for evaluating a standard substance according to claim 3, wherein evaluating the magnitude of the second standard substance based on the result of the re-determination of the second standard substance comprises:
by passing throughCalculating the magnitude accuracy of the second standard substance;
wherein,representing the accuracy of the magnitude of the second standard substance, +.>Certificate value representing the second standard substance, +.>Indicating the re-calibration result of the second standard substance, < >>Indicating the degree of uncertainty of the expansion of the second standard substance, < >>Representing an extended uncertainty of the re-setting process;
and evaluating the magnitude of the second standard substance based on the magnitude accuracy of the second standard substance.
9. The method for evaluating a standard substance according to claim 1, further comprising:
in the case of joint evaluation of the second standard substance by a plurality of experiments, the second standard substance was evaluated by doe=x j –x a Calculating the magnitude equivalence degree of the second standard substance;
wherein DoE represents the magnitude equivalent of the second standard substance,x j the re-determined value results obtained from any one experiment are shown,x a representing the certification value of the second standard.
10. The method for evaluating a standard substance according to claim 9, further comprising:
in the case of joint evaluation of the second standard substance by multiple experiments, the method comprises
Calculating uncertainty of the magnitude equivalence degree;
wherein,represents an uncertainty in the magnitude equivalence,u j representation ofx j The degree of uncertainty of the corresponding one of the two,u a representation ofx a Corresponding uncertainty.
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