Suggest a few improvements that can be made to enhance the separation or sensitivity of the existing method. Is the UV-visible detection a good method as far as the general properties of an ideal detector are concerned? What is the role of acetic acid in the mobile phase?
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Suggest a few improvements that can be made to enhance the separation or sensitivity of the existing method.
Is the UV-visible detection a good method as far as the general properties of an ideal detector are concerned?
What is the role of acetic acid in the mobile phase?
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- Mass spectrometry is an extremely versatile detection system for GC. However, interfacing an HPLC system to a mass spectrometer is a much more difficult task. Describe the major reasons why it is more difficult to combine HPLC with mass spectrometry than it is to combine GC with mass spectrometry.Discuss the advantages and disadvantages of sequential versus simultaneous multichannel ICP spectrometers.Which statement accurately contrasts flame atomization and graphite furnace atomization in Atomic Absorption Spectroscopy (AAS)? Flame atomization requires smaller sample volumes compared to graphite furnace atomization, which is more suitable for bulk analysis. Graphite furnace atomization achieves higher temperatures than flame atomization, often resulting in better sensitivity and lower detection limits. Flame atomization is typically used for solids and high-viscosity liquids, whereas graphite furnace atomization is preferred for volatile liquid samples. Graphite furnace atomization is a less precise method than flame atomization due to the inhomogeneity of the sample matrix within the furnace.
- i) Find the differences between the AES and XPS in terms of principle and information obtained from the spectra. ii) Why AFM is mostly utilized microscopic method for the determination of the thickness of the film?Please answer all required.(a) Three components in a mixture have varying distribution constants between the mobile phase and the stationary phase. One of the components has a very high 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? (b) One way to dramatically increase the sensitivity of a quadrupole mass spectrometer is to use a technique called selected ion monitoring (SIM). Explain how this technique works and why it improves sensitivity. Explain what dwell time means. Be sure to draw a diagram and describe how this analysis scheme works. Also, is there a compromise between a wide range of masses scanned and SIM? Explain in easy details.
- Flame Atomic Absorption Spectroscopy (FAAS) method is selected due to its wide applicability for metal ion analysis in drinking water samples. Provide appropriate discussion to determine the concentration of selected heavy metals (Cu and Cr) in the unknown tap water sample.Inductively coupled plasma–optical emission spectrometry (ICP-OES) was used for the determination of cadmium using indium as an internal standard. A solution containing 2.15 ppm Cd2+ and 5.76 ppm In3+ gave signals of 19,291 and 37,190 counts for cadmium and indium, respectively. A 0.01652 g sample was dissolved in acid and quantitatively transferred to a 250.0 mL volumetric flask. A 1.00 mL aliquot of 264.5 ppm In3+ was added and the flask was diluted to volume with deionized water. ICP-OES analysis of the sample solution gave signals of 31,109 and 118,941 counts for cadmium and indium, respectively. What was concentration of the Cd2+ in the sample? Give answer all questions with explanationWhich of the following statement is incorrect? The quality of grating of the monochromator affects the resolution of two closely spaced wavelengths in a spectrum. OICP (Inductively coupled plasma) is commonly used in atomic emission spectrometry. Cuvette is generally used for atomic absorption spectrometry (AAS) as the sample cell. The measurement in fluorescence spectrometry is generally more sensitive than absorption spectrometry.
- A spectrophotometer method for the quantitative analysis of Pb2+ in blood uses Cu2+ as an internal standard. A standard containing 1.75 ppb Pb2+ and 2.25 ppb Cu2+ yields a signal of 0.832 for Pb2+ and a signal of 0.351 for Cu2+. A sample of blood is spiked with the same concentration of Cu2+, giving a signal of 0.520 for Pb2+ and 0.289 for Cu2+. Determine the concentration of Pb2+ in the sample of blood.The determination of iron in wines was carried out by atomic absorption spectrophotometry, using the standard addition method. To do this, 10 mL of wine were placed in five 50 mL volumetric flasks; then 0, 5, 10, 15 and 20 mL of a 10 ppm iron standard solution were added to each of them. Next, they were gauged with distilled water and the absorbance was measured, obtaining the values of 0.040, 0.062, 0.081, 0.102 and 0.125 respectively. Calculate the regression parameters and obtain the iron concentration in the wine, in µg / mL.A sample of water from the North Sea was analysed by ion-chromatography and the sulfate concentration was determined to be 2960 mg/L. A sample of formation water from a reservoir near Shetland was analysed by atomic emission spectroscopy and thestrontium concentration was determined to be 770 mg/L. If the Ksp value for strontium sulfate is 3. 44x10-7 mo? L2 predict whether precipitation should occur if 500 ml of the seawater is mixed with 500 ml of the formation water.
