It is not of the solute property detector used in HPLC is: a. Refractive index detector b. UV detector c. fluorescence detector d. UV-visible detector
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- What is laser ablation and how can it he used to sample solids for ICPMS?One disadvantage of thin layer chromatography is that... it cannot be used for quantitative measurements. O it consumes large volumes of solvents O it cannot analyze volatile samples it cannot be used to analyze many samples simultaneously it requires a large amount of sample for analysisBased on the information given, what separation technique(s) is/are most likely feasible? please explain. a.Recrystallization b.Decolorization c.Sublimation d.Distillation e.Extraction f.Chromatography
- 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. Solubility3. What is particulate gravimetry? When do we use this technique? 4. What are the conditions for a successful gravimetric analysis. 5. Define nucleation. What conditions are important for this stage.Chemistry Briefly describe the differences between the scanning and SIM approaches with reference to your data. Discuss how and why your scanning (TIC) and SIM (mass chromatograms look different. Pay particular attention to selectivity of compounds detected and signal-to-noise. What are some advantages of SIM? What are some disadvantages?
- Which of the following is TRUE regarding instrumental methods of analysis? A. these methods have lower throughput compared to classical method. B. these methods have lower accuracy compared to classical methods. C. these methods can measure lower analyte concentration than classical methods D. these methods have higher precision compared to classical methods.Which of the following is not an advantage of instrumental methods? a. The ability to perform trace analysis. b. No standard is required A large numbers of samples may be analyzed very quickly. d. Most instrumental methods are multichannel techniques.19. What type of sample analysis usually operates on the 10-4 g scale of sample size? A. macro analysis C. micro analysis B. semi-micro D. ultra-micro analysis analysis 20. Under what classification does a constituent group when its concentration is between 100 ppm and 1ppb? A. Major constituents B. Interferences C. Minor D. Trace constituents constituent
- Which is not a common detector for GC? a. Refractive index detector b. Flame ionization detector c. Thermal conductivity detector d. Mass spectrometry e. All these are common1. Which following statement is NOT correct for Matrix-Assisted Laser Desorption/Ionization (MALDI) MS technique? A. Low concentration of analyte uniformly dispensed in a solid or liquid matrix deposited on metal plate B.MALDI matrix must strongly absorb laser radiation C.Matrix materials is not applied for biomolecules with laser wavelengths D. Analyte concentration in μM range 2. The Beer-Lambert Law A states that transmittance is linearly related to concentration B. requires that the product of absorptivity and pathlength be known before absorbance can be related to concentration C.requires that absorptivity be independent of wavelength D. cannot be used if more than one absorbing species is present in a sample 3. Flame atomizers A. have an optical path length based on the length of the burner slot B. vary in temperature based on the choice of fuel and oxidant C. typically allow sample introduction by aspiration and nebulization of a liquid D. all of the above 4. Which figure…Which technique is based on the stronger attractionsome components have for the stationary phasecompared to the mobile phase? A. filtration D. chromatographyB. distillation E. sublimationC. crystallization
