ASTM-D7440 2008

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D7440-08 Standard Practice for Characterizing Uncertainty in Air Quality Measurements

Published By	Publication Date	Number of Pages
ASTM	2008	14

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Categories: 13.040.20 - Ambient atmospheres, ASTM

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Description

1.1 This practice is for assisting developers and users of air quality methods for sampling concentrations of both airborne and settled materials in characterizing measurements as to uncertainty. Where possible, analysis into uncertainty components as recommended in the ISO Guide to the Expression of Uncertainty in Measurement ( 1 , ISO GUM) is suggested. Aspects of uncertainty estimation particular to air quality measurement are emphasized. For example, air quality assessment is often complicated by: the difficulty of taking replicate measurements owing to the large spatio-temporal variation in concentration values to be measured; systematic error or bias, both corrected and uncorrected; and the (rare) non-normal distribution of errors. This practice operates mainly through example. Background and mathematical development are relegated to appendices for optional reading.

1.2 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

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PDF Pages	PDF Title
1	Scope Referenced Documents Terminology
2	Background Information
3	Significance and Use Summary of Practice TABLE 1
4	Specific Examples
5	FIG. 1
7	Reporting Uncertainty TABLE 2
8	TABLE 3 TABLE 4 TABLE 5 TABLE 6 TABLE 7
9	X1. UNCERTAINTY AND THE SYMMETRIC ACCURACY RANGE A X1.1 Definition X1.2 Collapse of the Accuracy Measure to the Expanded Uncertainty U X1.3 Applications of the Accuracy Range A Beyond Uncertainty FIG. X1.1
10	X2. UNCERTAIN BIAS X2.1 X2.2
11	X2.3 X3. EXAMPLE: ROUND-ROBIN UNCERTAINTY ANALYSIS X3.1 Model X3.2 Intra-Lab Uncertainty X3.3 Inter-Lab Uncertainty X3.4 Bias Estimation
12	X3.5 Bias Correction X3.6 The Uncertainty Components X3.7 Bias Correction Uncertainty X3.8 The Combined and Expanded Uncertainties X4. UNDETECTABLE OUTLIERS X4.1 X4.2 X4.3 X4.4
13	X4.5 FIG. X4.1
14	REFERENCES

Additional information

Standard Title	D7440-08 Standard Practice for Characterizing Uncertainty in Air Quality Measurements
Published Code	ASTM
Publication Date	2008
Pages Count	14
ICS Codes	13.040.20 - Ambient atmospheres

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ASTM-D7440 2008

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