Peak height ratios

After adding a 10.00-mL portion of the internal standard, the solution was filtered. Analysis of the sample gave a peak height ratio of 23.2 for ASA and 17.9 for CAE. 

In our early evaluations, three parameters were utilized for the resolving power of the columns (3,4,7). These were the valley-to-peak height ratio, v, the peak separation parameter, P, and the parameter mentioned earlier, Djcr. The valley-to-peak height ratio is defined as... 

Results The raw data consisted of peak height ratios of signal internal standard, see data files VALIDl.dat (primary validation m - 0 repeats at every concentration), VALID2.dat (between-day variability), and VALID3. dat (combination of a single-day calibration with several repeats at 35 and 350 [ng/mlj in preparation of placing QC-sample concentration near these values). Fig. 4.29 shows the results of the back-calculation for all three files, for both the lin/lin and the log/log evaluations. Fig. 4.30 shows the pooled data from file VALID2.dat. 

Figure 5.34. (a) Shows the relation between Auger peak height ratio (P/Fe) and the crystallographic... 

IS. Peak-area or peak-height ratios are calculated for the analyte and IS and plotted against the ratios of known concentration of the analyte and IS. 

Injection number Component lialilMl8i B Peak height inimi Component Peak height (nun) Peak heights ratio... 

Fm each injLViii ii the ratio nl ethanol peak heigln in propanol peak. hcieht was calculated and a er.tph of iln- peak heights ratio againM ciluuol contciiiraiiitn was drawn. 

I lie ethanol etest sample was read off the graph giving a concentration of 12.1 gl. ... 

Figure 2.12 Ratio of peak area and height related to time constant of detector. Experimental conditions are the same as those in Figure 2.11. Peak height and area ratios are calculated from the data of peak nos. 1 and 4 as a %> of the maximum value. Lines A, peak height ratio of chromatograms measured at...

Figure 8.16. The luminescence ratio as a function of the angle 0 for the mode pairs TF.M 4/TMh,4 and TE68 3/TM68J. The two points show the measured peak height ratios from the data in Figure 8.15.

Figure 8.26. Plot of the acceptor/donor peak height ratio as a function of the acceptor concentration, for the two systems C1/R6G and 9AA/R6G. The straight line is an extrapolation to low concentrations of bulk data for the C1/R6G system.

Figure 66D was obtained for the same CdTe(lll) crystal after electrochemical reduction at -2.0 V for 2 minutes. Transitions for both Cd and Te are evident, and the Cd/Te peak height ratio is similar to that observed by other workers for stoichiometric CdTe [393,394]. In addition, well-ordered (1 X 1) LEED patterns (Fig. 67) were observed on both the CdTe(lll)-Cd and CdTe(lll)-Te faces. This is in contrast to CdTe surfaces prepared by ion bombardment, where postbombardment annealing was required to produce a LEED pattern, and the annealing appeared to result in formation of a reconstructed surface. In summary, well-ordered, clean, and unreconstructed CdTe surfaces have been produced using a wet etching/electrochemical treatment. 

Figure 2 Anthracene monomer, 1(427)71(405) and anthraeene-toluidine exciplex to monomer, 1(540)71(405) peak height ratios from a single sample, scanned repeatedly over the first 90 min of cure.

System (4) has been reported for the simultaneous determination of cortisol and cortisone in human plasma by stable-isotope dilution-MS [178]. For the determination, capillary GC-MS with H5 -cortisol and H5 -cortisone (as internal standards) was used. The method used a SPB-1 fused-silica capillary column (7 m x 0.25 mm) and helium as the carrier gas (at 29.4 Pa), with 70 eV EIMS being used for selective-ion monitoring. The concentrations were determined from the peak height ratios of the [M-31] fragment ions of the methoxime-TMS derivatives of cortisol, cortisone, and their internal standards. The sensitivity of the method was 200 pg per injection for both cortisol and cortisone. 

The within-run precision of derivatisation and chromatography procedures was assessed in the reported work a single standard solution was analysed in eight replicates. The relative standard deviation values of the peak-height ratios ranged from... 

In actual operation, the molecular weight of an unknown can be determined by measuring the area or peak height ratio and using a K established for known compounds. Fortunately, it is not necessary to know the amount of sample introduced. For either molecular weight or... 

The uncertainties of K and the response ratio depend upon the ability to measure detector response. Peak height ratios can be used with excellent results (generally better than areas) when the peaks are symmetrical and sharp. Peak hight ratios are also more useful than peak areas in overlapping peaks. For automated systems, peak areas are preferred since the ratios are readily measured, and the data are calculated with electronic integrators and computers. 

Figure 15. Seasonal changes in dissolved organic phosphorus detected by 31P FT-NMR spectroscopy. The peak height ratio was 4.0-5.0 ppm 0.0-2.0 ppm.

Fulvic acid from the Suwannee River was used to calibrate peak-height ratios for aromatic carbon content. The application of this method to fulvic acid samples with known aromatic plus olefinic carbon content from various environments is shown in Table II. Aromatic plus olefinic carbon percentages calculated by the peak-height ratio method using lH NMR data closely agree with these percentages computed from 13C NMR data, with the exception of the Big Soda Lake samples. 

H NMR data from these seven sites are presented by spectral peak-height ratios in Table III. The sites were listed in order of increasing aromatic plus olefinic carbon percentages. Fulvic acids from all the lake samples are much lower in aromatic plus oleflnic carbon content than those from river samples. These results confirm the hypothesis that autothonous inputs result in dissolved humic substances that have a low aromatic plus oleflnic carbon content. The lake samples also are lower in the ratios of peak 2 (carboxylated chains and aliphatic ketones), peak 3 (carbohydrates), and peak 4 (phenolic tannins and lignins) to peak 1 (branched methyl groups and alicyclic ali-phatics) than are the river samples. 

The Sagavanirktok River is intermediate in aromatic carbon content. This river drains the bogs on the Arctic tundra (allochthonous inputs) and several lakes (autochthonous inputs). Samples from the Suwannee and Calcasieu rivers are very similar in peak-height ratios with the exception of peak 2 1 ratio, which is much lower for the Calcasieu River sample. The data in Table II indicate that the Calcasieu River fulvic acid has a greater ring content... 

Table III H-NMR Spectral Peak-Height Ratios and Aromatic Plus Olefinic Carbon Contents of Dissolved Humic Substances...

Fig. 23. The amount of carbon on the catalyst surface at steady-state reaction under standard conditions. An Auger peak height ratio of 4.0 corresponds to approximately 1.0 monolayer of carbon. Line through points at a 2-kcal/mole slope.

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