ASTM D7911-14
使用与挥发性有机化合物排放室试验相关的测量偏差表征的参考材料的标准指南

Standard Guide for Using Reference Material to Characterize Measurement Bias Associated with Volatile Organic Compound Emission Chamber Test

被代替

标准号

ASTM D7911-14

发布

2014年

发布单位

美国材料与试验协会

替代标准

ASTM D7911-19

当前最新

ASTM D7911-19

 

 

引用标准

ASTM D1356 ASTM D5116 ASTM D5197 ASTM D5466 ASTM D6007 ASTM D6196 ASTM D6299 ASTM D6330 ASTM D6617 ASTM D6670 ASTM D6803 ASTM D7143 ASTM D7339 ASTM D7440 ASTM D7706 ASTM E1333 ASTM E691 ASTM E741 ISO 12219-3 ISO 16000-10 ISO 16000-11 ISO 16000-3 ISO 16000-6 ISO 16000-9 ISO/IEC 17025 ISO/IEC 17043

适用范围

5.1 Chamber testing is a globally-accepted method for measuring the emissions of VOCs from building materials and products. Chamber emission test data have a variety of uses including identification and labeling of products as low-VOC emitting for improved indoor air quality, manufacturing quality control, and development of new and improved products for reduced VOC emissions.

5.2 Currently, an inter-laboratory study (ILS) is the most frequently used method for assessing the bias of a laboratory’s VOC emission test results. An ILS typically relies on a VOC source with an uncharacterized emission rate. Consequently, a large number of participants (Practice E691 recommends 30, with a minimum requirement of six) are needed to produce the data required to calculate a laboratory’s performance relative to the central tendency and distribution of the results for all participants. Due to the participant size requirement and other logistical issues, an ILS involves significant planning and coordination to achieve useful results.

5.3 Inter-laboratory studies have often shown significant variations in measured VOC emission rates among participating laboratories for a given source. Variability in the emission rate from the source often is suspected to be a contributing factor, but it is difficult to be certain of the cause. Thus, better characterized sources are needed for evaluating the ability of laboratories to generate VOC emission test results with acceptable bias as discussed in 8.6.

5.4 Proficiency tests (PT) for VOC emission testing typically focus on a laboratory’s analytical capabilities. For example, an analytical PT relies on a certified standard prepared by an accredited vendor as a reference. A laboratory analyzes the PT sample without knowledge of its concentration value. Acceptance of the results is judged by the deviation from the known value. Use of reference materials can expand analytical PT schemes to also include the impacts of test sample handling, test specimen preparation, chamber operation, and chamber air sampling.

5.5 Laboratories accredited under ISO/IEC 17025 are required to derive uncertainty estimates for their test results. Typically, this is done by developing an uncertainty budget and estimating an expanded uncertainty (ISO/IEC Guide 98, Practice D7440). An uncertainty budget for a VOC emission test combines relevant sources of measurement uncertainty for all steps in the testing process from test specimen preparation through air sample analysis. A more efficient approach to determining the overall bias and precision for a VOC emission test is with repeated testing of a reference material (see ISO/IEC Guide 98, ISO Guide 33). This guide addresses the estimation of bias through comparison of the measured value to the reference material value. The precision is determined through repeated testing of multiple reference materials, ideally from the same production batch (see Practices D6299 and E691).

5.6 Other uses of an emissions reference material include verifying quality control emission measurements of manufactured product batches and providing traceability for third party certificatio......

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