Wavelength selector in atomic absorption spectrometer will limit the radiation absorbed by a sample to a certain wavelength. Give a common wavelength selector used in an atomic absorption spectroscopy (AAS). (а) (b) Discuss the reasons why device stated in (a) is important to improve the sensitivity of an AAS. (c) Differentiate between graphite furnace and flame furnace used in an AAS. 2.

Wavelength selector in atomic absorption spectrometer will limit the radiation absorbed by a sample to a certain wavelength. Give a common wavelength selector used in an atomic absorption spectroscopy (AAS). (а) (b) Discuss the reasons why device stated in (a) is important to improve the sensitivity of an AAS. (c) Differentiate between graphite furnace and flame furnace used in an AAS. 2.

Appl Of Ms Excel In Analytical Chemistry

2nd Edition

ISBN:9781285686691

Author:Crouch

Publisher:Crouch

Chapter12: Spectrochemical Methods

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

(a) Draw a block diagram of an atomic absorption spectrometer (AAS). Briefly describe the function of each components. (b) What is the process of atomization in atomic absorption spectrometer? Describe the steps of the process in the correct sequence. (c) State TWO interferences that are encountered in atomic absorption spectrometer. Suggest ONE solution to overcome the problem. (d.) What is the main difference, in terms of instrumentation, between atomic absorption spectrometer and atomic emission spectroscopy?
Atomic Spectroscopy (a) In terms of spectral shape, how are atomic spectra different from molecular spectra? What is the source of this difference? (b) Describe the decision-making process for picking a line for atomic emission analysis of a given analyte. (c) For quality assurance, spike recovery is not sufficient to establish confidence in an analytical procedure. Explain this statement. What should be done instead to demonstrate satisfactory performance of an instrumental method (including elemental analysis). (d) Find a literature example of atomic spectroscopy used for elemental analysis. State the operating conditions with sufficient detail to reproduce the analysis; Please answer very soon will give rating surely All questions complete Answer needed Please help me
b) Describe the principles of operation of graphite furnace Atomic Absorption Spectroscopy (GFAAS) and how can be used in forensic science. In you answer; (i) Explain the principle of Atomic Absorption Spectroscopy. (ii) Describe the principle components of the apparatus, particularly the light source and furnace (iii) Describe the three steps in atomising a liquid sample. (iv) Explain what is the role of matrix modifiers?
3. The following data were obtained at various wavelengths for a 3.6 ´ 10–4 M solution of permanganate in a cell with a path length of 1.00 cm. (Table is in attached) (a) Plot an absorption spectrum for permanganate using these data. (b) From the absorption spectrum obtained, determine the wavelength that permanganate has the strongest absorption. (c) Estimate the molar absorptivity (with proper unit) of permanganate at the absorption maximum. (d) A sample solution containing permanganate gives a %T of 40.0 at the absorption maximum. What is the concentration of permanganate in the sample?
(5) A sample of sodium phosphate is dissolved in water to give 100.00 mL of solution (Solution A). Then this solution is diluted 5 times to give the final solution (Solution B). Solution B is Known to contain 3.920 x 1022 number of PO43- ions, which has an absorption peak at 460 nm and absorbance value of 0.355 in a 1.000 cm cuvette. (i) Calculate the molar absorptivity of Solution B. (ii) What mass of sodium phosphate (MM 163.94 g/mol) dissolved in Solution A.
What color would you expect for light transmitted through a solution with an absorption maximum at (a) 450; (b) 550; (c) 650 nm?
The transmittance of a solution measured at 590 nm in a 1.5-cm cuvette was 76.2%. (a) What is the corresponding absorbance?(b) If the concentration is 0.0802 M, what is the absorptivity of this species at this wavelength? (c) If the absorptivity is 10,000 L mol-1 cm-1, what is the concentration?
The following questions are related to the three important types of atomic spectrometers: (i) Contrast and compare atomic emission based spectroscopy toward an atomic absorption based spectroscopy. (ii) Explain why a high-temperature nitrous oxide-acetylene flame is sometimes required in a flame-AAS.
A sample of hydrogen gas was placed in a discharge tube and its spectrum was measured using a highresolution spectrometer. The Hline in the spectrum was found to be split into two lines, a highintensity line at 656.28 nm, and a low intensity line at 656.01 nm. This indicates that the hydrogensample was contaminated with(a) deuterium (b) tritium(c) helium (d) water vapour
(i) Explain why Beer's Law breaks down when absorbance values are < 0.005. (ii) Explain the operation of a calcium source used in atomic absorbance spectroscopy. (iii) Explain why the calcium source described above will not operate for the quantification of magnesium.
i) Discuss the differences between the AES and XPS in terms of principle and information obtained from the spectra.
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.