A testing lab must evaluate and determine the contribution of the uncertainty of measurements for each testing methodology in order to implement the reliability and accuracy of tests. In addition, the uncertainty index must be specified in the test (measurement) protocols.
Uncertainty can be calculated by using various methods; however, when the desired value of the output parameter is determined from a graph, the method of least squares should be used. In order to determine the toxicity index of combustion products, a series of tests using white laboratory mice have been conducted. Based on the test results, a graph of the dependence of lab mice lethality on the concentration of toxic combustion products has been built; the dose causing the lethality of 50 % of lab mice has been determined.
Using the method of least squares, confidence limits of the estimate of measured value have been calculated and graphically shown. As a result of calculations, the uncertainty of toxicity of combustion products was determined as around 25 %. The wide range of data has been caused by the error of measuring equipment, heterogeneity of the test sample and its composition, as well as the characteristics of lab mice and their biological features.
The results of uncertainty calculation provided in the article can be used by laboratories conducting fire safety tests of materials.
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