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Ion Chromatography Determination of Uncertainty bromate

Determined by ion chromatography in water splash Uncertainty of bromate laboratory temperature changes between 4 ℃, the volume of water called the expansion coefficient of 2.1 × l0 ℃, the temperature change is assumed rectangular distribution, k =, / 3, volumetric flask and the solution temperature is lOOml relative uncertainty introduced: 4) =: 0.000480rr4 one hundred and eleven U. √ 3 × 100 standard stock solution prepared to introduce the relative combined standard uncertainty is: UL (f )=~/\00,114.2 standard series solution preparation process of the introduction of the relative standard uncertainty U2 (,-d) to dilute the largest number and uncertainty 5.Oug / L concentration of point representatives. will lO00mg / L stock standard solution, respectively 5ml, lOml pipette and lOOml,[link widoczny dla zalogowanych], 500ml volumetric flask, diluted by 3 times after. measuring flask and pipette the tolerance range by the rectangular distribution, k = √ 3. set the laboratory temperature changes between 4 ℃, volume expansion coefficient of water 2.1 × 10I4 ℃, the temperature change is assumed rectangular distribution, k: 43. the flask and pipette,[link widoczny dla zalogowanych], respectively, the uncertainty tolerance by the scale reading the introduction and use of temperature difference, its relatively certainty in Table 1. Table 1 pipette and flask into the relative uncertainty of the standard series solution preparation process of the synthesis of the relative standard uncertainty U2 (re1) is: \, 6 )+\.10,0.20 mg / L) measured 3 times each, for a total of 12 times. The results in Table 2. access to standard working solution, bromate peak area A, the concentration of the standard working curve y using least squares fitting Bromate analysis was the standard equation of working curve Y: 1.4019A a 0.0018 correlation coefficient of r = 0.99993,[link widoczny dla zalogowanych], standard deviation of the regression line was 0.0050 S, were measured on the sample 2, that is, P: o solution of potassium bromate in samples measured the concentration of bromate concentration of the sample Y is 0.03lmg / L, the average concentration of the standard point y is 0.09mg / L, the standard working curve and the concentration difference square 0.0606. Table 2 calibration standard solution peak area measurements are as follows: standard curve fitting formula for calculating the relative standard uncertainty Ji + + = o.4.4 combined uncertainty measurement uncertainty of bromate in water degree of weight in Table 3. Table 3 subscales Uncertainty combined standard uncertainty of 4.5 measured in this experiment bromate in water content () was 0.031, according to data model C (with B ~ meter) = Y, then calculate the relative uncertainty of bromate to: UC (te1) = √ \,[link widoczny dla zalogowanych], the probability of a 95% confidence interval for the best, including the factors taken a = 2,[link widoczny dla zalogowanych], then the expanded uncertainty: = kX2X0.0038: 0. O08 (mg / L) 4.7 report measurement uncertainty provided by GBZI'5750 .10-2006 measurement procedure, the sample in the bromate content of 0.031mg / L (to BrO3 a meter), The expanded uncertainty U () = O. O08mg / L. The Y: Y ± U () = 0.031 ± 0. O08mg / L [1] Shi-Fen Mou. Liu Faulkner. Ion chromatography and its application [M]. Beijing: Chemical Industry Press, 2000. [2] GB / I'5750 .10-2006. Drinking water standard test methods. Disinfection by-products index [S]. [3] Dongdao Ming, Sun Jun. Ion Chromatography of chloride ions in water samples Evaluation of uncertainty [J]. CHEMICAL ANALYSIS, 2007.1 (16) :8-10. [4] China Laboratory Accreditation Committee. Chemical analysis of uncertainty in the assessment guidelines [M]. China Metrology Publishing House, 2002. [5] JJG1059-1999. Evaluation of Uncertainty and that [S]. [6] Ni Incubation. Evaluation of Uncertainty in consumption (second edition) [M]. China Metrology Publishing House, 2007. About the author: New Ping Yi, female, senior engineer. Company: Xinjiang Institute of Product Quality Supervision and Inspection. Address: 830 017 Xinhua Road, Urumqi, 167. Received date :2009-07-07

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