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- A method of quantitative determination of the concentration of constituentsof a sample analyzed by gas chromatography is area normalization. Thiscomplete elution of all sample constituents is required. Thearea of each peak is measured and corrected for the detector response to the diffe- renteseluatos. This correction involves dividing the area by an empiricalcorrection factorDetermined. The concen ration of the analyte is found from the ratio between itscorrected and the total corrected area of all peaks. For a chromatogram containing threerelative areas were determined as 16.4; 45,2; and 30.2, in the order ofincreased retention time. Calculate the percentage of each compound if therelative responses from the detector are 0.65, 0.73 and 0.85, respectively.The following tests are used for control of organic impurities in organic medicinal substances, except ... O a. Thin Layer Chromatography O b. Viscosity O c. pH of solution O d. SolubilityIn lab two dikferent mobile phase compositions were used for column Chromatoghaphy. DiSCUSShow the hokile Phase composit ron effeet the hesults of the column separation of spinach pigmerts as it was eident by the ThC.Was the resulH expeeted basedon theory?
- in high preformance liquied chromarography, what is a Bi phenyl , and what its application and mechnisim and the retention time depand on what ?the efficiency of a chromatographic column improves the measure thata.increases the height of the theoretical dishesb.decreases the number of theoretical platesc.platform height is reducedd.None of the above Which option is correct And explainWhy is glass better than fused silica as a prism construction material for a monochromator to be used in the region of 400 to 80 nm?
- 3.Explainthethin-layerchromatographicpuritycheckprocedureforanalysisofanunknownorganic compound.H4)ConsiteR the following Beaction: Pa,t 8 H,0→ Hy POqt 3 HCl IP 12.49 of | 10.09 of Hy O, what is the limiting Ctrl PCI, is PeacteD witn T0.0g Peactant ? Molar nhass of Pelg: 137.329/mel. holarmass of HoO=18:0291 mel malar mass of Hy POz =¢2.00 glmol molar mass of HCl= 35.4A16 glmel. %3Dhree components in a mixture have varying distribution constants between the mobile phase and the stationary phass One of the components has a very low distribution constant, Would this component likely elute first or last and how would you design an experiment or modify the components of the separation to make it perform in the opposite manner?
- In the development o f an analytical method for the quantitative analysis o f iron using Atomic Absorption spectrophotometry (AAS), a linear calibration curve for standards o f 0.00, 5.00, 10.00, 15.00 and 20.00 ppm was prepared. An iron ore sample with an expected iron content o f 40-60% w/w is to be analysed by this method. An approximately 0.5-g sample is taken, dissolved in a minimum amount o f concentrated HC1 and diluted to 1 L in a volumetric flask using distilled water. A 5.00-mL aliquot is removed with a pipette. With explanation, to what volume (10, 25, 50, 100, 250 500 or 1000 mL) should the 5.00 mL aliquot be diluted, to minimize the uncertainty in the analysis?In have narrow peaks are said to chromatography, a) a large plate height (H) b) a small plate height (H) c) a small number of theoretical plates (N)The following data give the recovery of bromide from spiked samples of vegetable matter, measuredusing a gas–liquid chromatographic method. The same amount of bromide was added to each specimen(Roughan, J.A., Roughan, P.A. and Wilkins, J.P.G., 1983, Analyst, 108: 742).Tomato: 777 790 759 790 770 758 764 ug/gCucumber: 782 773 778 765 789 797 782 ug/g(a) Test whether the recoveries from the two vegetables have variances which differ significantly.(b) Test whether the mean recovery rates differ significantly.