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Uncertainty Analysis of toluene in water and Evaluation

After many years of analysts apply this method to determine only the use of professional evaluation, the expanded uncertainty was 10g / L. The formation of these patterns between data from various laboratory studies, but also from the less skilled laboratory test results. So, although the differences between the various laboratories, the model prediction is reasonable. Made by a single laboratory uncertainty, with little to these patterns. 10t ~ g / L and laboratory evaluation of three measurement data (NARI2000) and experienced analysts to determine the consistency (Table 4). Based on these considerations, uncertainty is reasonable. Assessment identified all the major sources of uncertainty, so meet 1S0/IEC17025 requirements. AGAI level of participation in testing. Table 5 lists the results of testing the level of toluene. AGAL testing results and other participants in the median value obtained is very consistent. This uncertainty further proof of the reliability provided. Proficiency test results in table 5: the concentration of toluene AGAI results 230 - +45 p. g / I in the bit value (.9 degree measurement uncertainty and traceability traceability related. So traceable uncertainty must be interpreted in context. traceability is defined as: a requirement by the uncertainty of a unbroken chain of comparisons, the measurement results or measure the value of the specified reference standard to work with (usually with the national measurement standards or international measurement standards) features link. (JJFlOO1-1998) Toluene is a clear definition of the chemical substance,[link widoczny dla zalogowanych], so when we talk about water toluene concentration, with t ~ g / L to represent. We use the units kg and m. of international quality and quantity of toluene units (such as g and mole) with molecular weight of. 4 He Qiaosang, et al: Toluene in water Analysis and Evaluation of Uncertainty in international units to 287 from routine testing, there is a continuous chain. to allow the test results back to the basic unit of m, kg and mole. shown in Figure 3, the following is the traceability chains. day of pure toluene standards Guangdong certain volume of goods balance gauges r_] standard solution added pressure of the heart to control samples received solid Witch Witch Figure 3 Determination of toluene from the track to see Sl units preparing to export standard sample of pure toluene, the volume of standard sample is determined,[link widoczny dla zalogowanych], the corresponding SI units is kg and the mole, equivalent to about 0.5. on the preparation of standard solutions and the recoveries of control like a certain volume of gauges and scales calibration, the uncertainty about the concentration of control is 2. The solution will use a common method and estimate the deviation of all determined with this method is about the uncertainty generated 2O.10 Conclusion documented the detection method,[link widoczny dla zalogowanych], previous studies of the data, instrument calibration and routine quality control procedures, uncertainty of access to . According to the principles of GUM and Eurachem2000 __5], these data synthesis of existing data and the generalized uncertainty detection mode on benzene, the laboratory analysis results were compared between the study to assess the uncertainty. previous Uncertainty of data, there are practical, useful, easy to get help. follow ISo/IEC17025, in the appropriate quality control, use of effective methods to provide uncertainty all the necessary information. follow the GUM and Eurachem2000 guide, a suitable quality control, reasonable detection methods, mastered the relevant information, measurement traceable to International System of Units (SI), then the uncertainty can meet the requirements of ISO/IEC17025. 【Reference】 [ ,[link widoczny dla zalogowanych],],[link widoczny dla zalogowanych],[BTEX in water [J]. AND HEALTH, 2004 (4) 174. [3] National Quality and Technical Supervision. JJF1059-1999 Evaluation and Expression of Uncertainty in Measurement [M]. Beijing: China Metrology Press, 1999. [4] GuidetotheExpressionofUncertaintyinMeasurement, CorrectedandReprinted, 1995.Is (), Geneva, 1995 [S]. [5] Chinese National Laboratory Accreditation Board. Chemical analysis of uncertainty in the assessment guidelines [M]. Beijing: China Metrology Publishing Press, 2002,

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