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 Posted: Fri 4:59, 10 Dec 2010 Post subject: ugg boots billig Gas chromatography analysis of me |
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GC analysis of the metrology guarantee
Gas chromatography analysis of metrological verification guidance for a wide range although the gas chromatograph, the analysis of a variety of objects, but relatively simple test method, not fully reflect the use of the accuracy of the instrument. However, verification of the gas chromatography measurement still has an important significance: 1. Carrier gas flow rate of the control: by gas chromatography analysis shows that in the plate theory. Carrier gas flow rate have an impact on the measurement results, especially for the concentration detector of the instrument is particularly prominent. Therefore, the accuracy of carrier gas flow rate is to ensure the normal use of the premise equipment. 2 temperature and pressure control: gas chromatography analysis,[link widoczny dla zalogowanych], temperature, pressure not only affect the speed of analysis, the sample separation and column efficiency, but also directly affect the accuracy of the results. For example, the temperature difference of 2.7 ℃, and the injection volume of 1% difference; when the atmospheric pressure difference lem Hg, the volume difference l2%; the temperature difference between the l ℃, on the peak of 0.23% and so on. 3. Method choice: the purpose of the analysis can be used for reference measurement test results, based on the principles of standardization in the method of choice provisions. Analysis of the contents of the study measured Zhu Mu 2000 № 7, including: column selection, operating conditions, choice of method precision and reliability, etc., and ultimately to obtain accurate data. Reference [】 country with few Zhu Mu Supervision Bureau \] Chinese Academy of Sciences, Dalian Institute of Chemical Physics. \Chemical Industry Press, 5. Pan Xiurong \7 ~ 7ab (No letter of product quality in Anhui Province, Hefei 230022) s1 a V Abstract Based on the analysis of the error correction value and the proposed distribution to determine the correct value of the method should be used. Keywords Zhu Cymbidium, 1 lack of show, 1. in the detection instrument uncertainty, sometimes related to a revised instrument problems. The reason why people use the corrected value, mainly because in some cases, the modified instrument will reduce the system error, equipment increase the accuracy. And from the perspective of uncertainty, the amendment can reduce uncertainty. For example, the amount of known standard 200mm blocks actual value of v for the 199.9ram, corresponding to three times the standard deviation of uncertainty into account by To 0.6ram, was seized of the actual value of the gauge block 200ram v unknown. using comparative methods, direct measurement is the calibration block with the standard amount of the difference between the actual value of the block 6 times, and its value were 1.3,1. 5,1.2,[link widoczny dla zalogowanych],1.6,1.5,1.4 (mil1). assume the process of measuring the amount of block two no change, according to measurement results can be obtained by standard gauge block and the actual value of the calibration block the average difference △ = △, / n = (1.3 +1.5 +1.2 +1.6 +1 .= L5 +1.45 / 6:1.42 (mrn5 (△ cent) z a √:..] 5 (ram) s = {= 0.06 (mm) 4 because it Y 一% = △ Y = + △ = 199.9 +1.42 = 201.32 (mm) 'Lu . This has nothing to do of the vt and △, in the absence of other sources of uncertainty, the actual value of the block were the calibration standard uncertainty of Y,[link widoczny dla zalogowanych], M (Y): √ (0.6 / 3) + (0.o65 = 021 (mm) if the check contains the factor k: 2,[link widoczny dla zalogowanych], the expanded uncertainty U: ku (Y): 2X0.21: 0.42 (ram) is the actual value of the calibration block and the expanded uncertainty can be Joint expressed as Y = 20000 +1.32 ± 0.42 (mm) This shows that the nominal value of 200ram been seized Xuan block, if the actual value according to the revised 201.32ram use, their uncertainty is developing 0.42ram. If the press does not use the revised nominal value. then the expanded uncertainty is 1.32 +0.42:17 ram. can be seen,[link widoczny dla zalogowanych], modified to reduce uncertainty. 2 as the correct value to use, it the modified value caused Uncertainty. To this end, we must find out the error correction value and the standard instrument used for checking of equipment was seized when a standard instrument showing the value of A, the system error is q, random error is E, so is AD, then Al = A fJ Ruopi mouth ten ten qr showing the value of seized equipment A, the system error is q, the random error for the E, then A = Ao + Q + E
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