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Number of measurements: n = 8. 6516. 85 • X. The Intersection Point, Y UP , is obtained from eq. 21. Accordingly, YLO is obtained through YLQ = A — t • sR • square root term in eq. 91 (for quick calculation, use YLO = 2 • A — Y UP ). 3). The following steps are, however, given for illustration, so that users carrying out the estimation of LDC or LDM either graphically or by computer (cf. Figure 6) can check their results versus the figures given here. Using eqs. 83. Eq. 28. Y c is the Y value, on the calibration line, for X = Xl.

G. conic ampoules N 18-5 (Macherey-Nagel No. 702240) Device for evaporating solvents in a nitrogen stream, suitable to take the 5-ml sample vials, e. g. Silli-Therm heating module with Silli-Vap evaporator and Reacti-Bar heating block (Pierce No. 19793, 19792 and 19785, respectively) Separatory funnel, 20-ml 4 Reagents Acetonitrile, HPLC quality (Promochem No. 2856) Dichloromethane, for chromatography (Riedel-de Haen No. 32222) Methanol, p. a. (Merck No. 6009) Water, HPLC quality (Baker No. 4218) Eluting mixture: acetonitrile + methanol 8:2 v/v Internal standard solution: 10 mg/ml diphenyl sulphone in methanol Hydrochloric acid, p.

UX X Fig. 8. Graphical derivation of Fig. 9. Graphical derivation of Xu Limits of Detection and Determination 23 Appendix Table 2. Critical values of the t distribution at a 95% level of statistical significance in relation to the degree of freedom f = n — 2. 021 Mass-Spectrometric El Data for Confirmation of Results GC/MS is an excellent tool for the confirmation of results in pesticide residue analysis. For this reason, the six most abundant fragments and their relative intensities for approx.

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On Certain Polynomial and Other Approximations to Analytic Functions by Portisky H.

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