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B Standard Solutions

Fig. 29.10.2 Chromatograms of ivermectin. A, Absolute detection limit (250 pg) B, standard solution (3.6 ng) C, blank meat sample D, spiked meat sample (22.5 ppb). (From Ref. 351.). Fig. 29.10.2 Chromatograms of ivermectin. A, Absolute detection limit (250 pg) B, standard solution (3.6 ng) C, blank meat sample D, spiked meat sample (22.5 ppb). (From Ref. 351.).
Figure 1 Calibration plots of chromium (a) and nickel (b) standard solutions, from data in Table 1. For chromium, a good jit can be dravm by eye. For nickel, however, a regression model should be derived. Table 1(b)... Figure 1 Calibration plots of chromium (a) and nickel (b) standard solutions, from data in Table 1. For chromium, a good jit can be dravm by eye. For nickel, however, a regression model should be derived. Table 1(b)...
A Spex Fluorolog 212 spectrophotometer was used for recording the emission and excitation spectra of the polyimide films and the model compounds. The slit width used for the films was 2 mm and for the model compounds was 1 mm. Excitation and emission spectra were subsequently normalized with respect to the lamp intensity fluctuations by dividing each spectrum by that obtained with a Rhodamine-B standard solution. Absorption spectra were obtained with... [Pg.33]

Fig. 7. Gas Chromatograms of a dried M. elengi flowers and standard. The specimen was purchased from a Thai traditional medicine store (a), sample extract with n-hexadecane as an internal standard and (b) standard solution containing benzyl alcohol, 2-phenylethanol, methylparaben and the internal standard. Gas chromatographic system GC (Hewlett Packard HP 6890, USA)/ FID detector Column (5%-Phenyl)-methylpolysiloxane, 30m, 0.25pm, 1 mm ID Oven temperature program 60 C to ISO C at 3 oC.min h to 280 oC.min- at 10 oC.min-i (hold 5 min) Run time 55.00 min Carrier gas flow rate (Nitrogen) 2 m-1/min. Fig. 7. Gas Chromatograms of a dried M. elengi flowers and standard. The specimen was purchased from a Thai traditional medicine store (a), sample extract with n-hexadecane as an internal standard and (b) standard solution containing benzyl alcohol, 2-phenylethanol, methylparaben and the internal standard. Gas chromatographic system GC (Hewlett Packard HP 6890, USA)/ FID detector Column (5%-Phenyl)-methylpolysiloxane, 30m, 0.25pm, 1 mm ID Oven temperature program 60 C to ISO C at 3 oC.min h to 280 oC.min- at 10 oC.min-i (hold 5 min) Run time 55.00 min Carrier gas flow rate (Nitrogen) 2 m-1/min.
A standard solution of Mn + was prepared by dissolving 0.250 g of Mn in 10 ml of concentrated HNO3 (measured with a graduated cylinder). The resulting solution was quantitatively transferred to a 100-mL volumetric flask and diluted to volume with distilled water. A 10-mL aliquot of the solution was pipeted into a 500-mL volumetric flask and diluted to volume, (a) Express the concentration of Mn in parts per million, and estimate uncertainty by a propagation of uncertainty calculation, (b) Would the uncertainty in the solution s concentration be improved... [Pg.99]

Methanol, which elutes at 4.69 min, is included as a neutral species to indicate the electroosmotic flow. When using standard solutions of each vitamin, CZE peaks are found at 3.41 min, 4.69 min, 6.31 min, and 8.31 min. Examine the structures and p/Ca information in Figure 12.47, and determine the order in which the four B vitamins elute. [Pg.607]

In titrimetric analysis (often termed volumetric analysis in certain books), the substance to be determined is allowed to react with an appropriate reagent added as a standard solution, and the volume of solution needed for complete reaction is determined. The common types of reaction which are used in titrimetry are (a) neutralisation (acid-base) reactions (b) complex-forming reactions (c) precipitation reactions (d) oxidation-reduction reactions. [Pg.7]

Pipette 25 mL of solution B into a 100 mL beaker mounted on a magnetic stirrer and add an equal volume of TISAB from a pipette. Stir the solution to ensure thorough mixing, stop the stirrer, insert the fluoride ion-calomel electrode system and measure the e.m.f. The electrode rapidly comes to equilibrium, and a stable e.m.f. reading is obtained immediately. Wash down the electrodes and then insert into a second beaker containing a solution prepared from 25 mL each of standard solution C and TISAB read the e.m.f. Carry out further determinations using the standards D and E. [Pg.572]

B. Duplication method. This is usually applied as the so-called colorimetric titration in which a known volume (x mL) of the test solution is treated in a Nessler cylinder with a measured volume (y mL) of appropriate reagent so that a colour is developed. Distilled water (x mL) is placed in a second Nessler cylinder together with y mL of reagent. A standard solution of the substance under test is now added to the second cylinder from a microburette until the colour developed matches that in the first tube the concentration of the test solution can then be calculated. The standard solution should be of such concentration that it amounts to no more than 2 per cent of the final solution. This method is only approximate but has the merit that only the simplest apparatus is required it will not be discussed further. [Pg.652]

Standard solution of iron(III). Use method (a), (b) or (c). (a) Dissolve 0.7022g ammonium iron(II) sulphate in 100mL water, add 5mL of 1 5 sulphuric acid, and run in cautiously a dilute solution of potassium permanganate (2 g L 1) until a slight pink coloration remains after stirring well. Dilute to 1 L and mix thoroughly. lmL = 0.1mg of Fe. (6) Dissolve 0.864 g ammonium iron(III) sulphate in water, add 10 mL concentrated hydrochloric acid and dilute... [Pg.690]

Prepare solution B by diluting a mixture of lO.OmL of the standard solution of the indicator and 25.0 mL of 0.04M sodium acetate to 100 mL. The pH of this solution is about 8, so that the indicator MR is present entirely as MR-. Measure the absorbance of solution B over the range 350-600nm as detailed for solution A with a manual spectrophotometer use 25 nm steps except for 400 450 nm, where 10 nm steps are recommended. Determine the wavelength 2B of maximum absorbance as above this is about 430 nm. The type of plots obtained for solutions A and B is shown in Fig. 17.21. The absorption peaks are not completely separated, but cross at a wavelength of about 460 nm. This point is known as the isobestic point . If the absorbance of a solution containing both HMR and MR - is measured at this wavelength, the observed absorbance is independent of the relative amounts of HMR and MR - present and depends only on the total amount of the indicator MR in the solution. [Pg.720]

Procedure. Measure the fluorescence intensities of each of the series of standard solutions at 345 nm, with excitation at 285 nm. Construct a calibration graph for each of the four series (a), (b), (c), and (d) above. [Pg.740]

Preparation of the standard solutions. For procedure (i) it is necessary to incorporate a releasing agent in the standard solutions. Three different releasing agents may be used for calcium, (a) lanthanum chloride, (b) strontium chloride and (c) EDTA of these (a) is the preferred reagent, but (b) or (c) make satisfactory alternatives. [Pg.806]

In practice VA, VB, and normality 4 (the standard solution) are known, hence normality B (the unknown solution) can be readily calculated. [Pg.845]

Figure 5.60 Calibration curves for the diarrhetic shellfish poisons in (i) standard solutions in methanol (O), and (11) standard solutions in poison-free scallop extract solutions ( ) (a) pectenotoxin-6 (b) okadaic acid (c) yessotoxin (d) dinophysistoxin-1. Reprinted from J. Chromatogr., A, 943, Matrix effect and correction by standard addition in quantitative liquid chromatographic-mass spectrometric analysis of diarrhetic shellfish poisoning toxins , Ito, S. and Tsukada, K., 39-46, Copyright (2002), with permission from Elsevier Science. Figure 5.60 Calibration curves for the diarrhetic shellfish poisons in (i) standard solutions in methanol (O), and (11) standard solutions in poison-free scallop extract solutions ( ) (a) pectenotoxin-6 (b) okadaic acid (c) yessotoxin (d) dinophysistoxin-1. Reprinted from J. Chromatogr., A, 943, Matrix effect and correction by standard addition in quantitative liquid chromatographic-mass spectrometric analysis of diarrhetic shellfish poisoning toxins , Ito, S. and Tsukada, K., 39-46, Copyright (2002), with permission from Elsevier Science.
Lam, R. B., and Isenhour, T. L., Minimizing Relative Error in the Preparation of Standard Solutions by Judicious Choice of Volumetric Glassware, Anal. Chem. 52, 1980, 1158-1161. [Pg.409]

Figure L Narrow range mass spectral scan of molecular ion region during GC elution of NDMA, A, Recorded at retention time of NDMA beer sample con-taining 0.6 fig/kg NDMA (0.15 ng). B. Background 1 min before elution of NDMA. C. Standard solution containing 0.4 ng NDMA. D. Background. Figure L Narrow range mass spectral scan of molecular ion region during GC elution of NDMA, A, Recorded at retention time of NDMA beer sample con-taining 0.6 fig/kg NDMA (0.15 ng). B. Background 1 min before elution of NDMA. C. Standard solution containing 0.4 ng NDMA. D. Background.
Figure 9.1 GC MS chromatograms acquired in the SIM mode of a laboratory blank (a) and an amino acid standard solution with concentrations at the quantitation limit (b). i.s.l, Hexadecane internal standard i.s.2, norleucine internal standard... Figure 9.1 GC MS chromatograms acquired in the SIM mode of a laboratory blank (a) and an amino acid standard solution with concentrations at the quantitation limit (b). i.s.l, Hexadecane internal standard i.s.2, norleucine internal standard...
Consequently, the research work of Hara s group continued focusing on the improvement of protein determination using CE combined with online CL detection. By replacing EY by the Rhodamine B isothiocyanate (RITC) dye in the binary complexes formed with the proteins BSA or human serum albumin (HSA) and using a different imidazole buffer solution of pH 6, the sensitivity was increased [72], However, best detection limits for these determinations were found employing the tetramethylrhodamine isothiocyanate isomer (TRITC) dye, left for 4 h with a standard solution of BSA in acetonitrile followed by introduction into the capillary. For BSA, a detection limit of 6 nM was reached [73],... [Pg.441]

In a typical extraction, 50 jiL of plasma was treated with 25 /./I. of internal standard solution and then diluted with 200 /iL of 3% ammonium hydroxide. The C18 /./-SPE tips were conditioned with 150 /iL of methanol and then 300 /./I. of 3% ammonium hydroxide. The sample was exhaustively extracted by aspirating and dispensing the plasma samples seven times from the dilution tube. For the wash, 90 /./I. of 3% ammonium hydroxide followed by 100 /./I. of methanokwater (20 80 v/v) was used. Elution was achieved with 50 /./I. of methanokwater (90 10 v/v). After evaporation of the collected eluate in the 96-well block, the residues were reconstituted in 200 fjL of mobile phase A B... [Pg.21]

Fig. 4.1 HPLC chromatography of (a) hexane extract of a sediment (b) a standard solution of DEHP and DBP. Retention times DEHP, 4.5min DPB, 7.5 min Source Reproduced with permission from Gordon and Breach [2]... Fig. 4.1 HPLC chromatography of (a) hexane extract of a sediment (b) a standard solution of DEHP and DBP. Retention times DEHP, 4.5min DPB, 7.5 min Source Reproduced with permission from Gordon and Breach [2]...
Fig. 2.3.2. LC chromatograms of a standard solution containing LAS and DATS obtained by eluting them on (a) Cg column and (b) Clg column. In both cases, peaks 1-4 are, respectively, for C10-C13 DATS, while peaks 5-8 are, respectively, for C10-C13 LAS. Reprinted with permission from Ref. [31] 2001 Elsevier. Fig. 2.3.2. LC chromatograms of a standard solution containing LAS and DATS obtained by eluting them on (a) Cg column and (b) Clg column. In both cases, peaks 1-4 are, respectively, for C10-C13 DATS, while peaks 5-8 are, respectively, for C10-C13 LAS. Reprinted with permission from Ref. [31] 2001 Elsevier.
Fig. 2.3.8. Chromatogram of the NIC derivatives of oleochemical AEOs in a standard solution (a) AEOs and NPEOs in extracts of the influent (b) and final effluent (c) of a sewage treatment plant. Chromatogram of the NC derivatives of PEGs in a standard solution (d) and extracts of the influent (e) and final effluent (f). Stationary phase Cis column mobile-phase methanol-acetonitrile (a)-(c) and acetonitrile-water (d)-(f). Fig. 2.3.8. Chromatogram of the NIC derivatives of oleochemical AEOs in a standard solution (a) AEOs and NPEOs in extracts of the influent (b) and final effluent (c) of a sewage treatment plant. Chromatogram of the NC derivatives of PEGs in a standard solution (d) and extracts of the influent (e) and final effluent (f). Stationary phase Cis column mobile-phase methanol-acetonitrile (a)-(c) and acetonitrile-water (d)-(f).

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