(a)
Interpretation:
The differences between the use of a hydrogen discharge lamp and deuterium discharge lamps as source for the ultraviolet radiations are to be explained.
Concept introduction:
The hydrogen discharge lamp as well as the deuterium discharge lamps are used to produce the radiations of ultraviolet radiations having the radiations of varied intensity depending on the usage of the discharge source in the lamp.
(b)
Interpretation:
The difference between the use of the filters and the monochromators as the wavelength selectors is to be explained.
Concept introduction:
The filters and the monochromators are specifically used for the selection of wavelength, but they are used differently based on their quantitative and qualitative applications. The filters as well as the monochromators are used as the wavelength selectors.But they both have their own fields of application.
(c)
Interpretation:
The difference between the use of photovoltaic cells and the phototubes as the
Concept introduction:
The photovoltaic cells as well as the phototubes work on the same principle. They both make use of the electromagnetic radiations incident on them to give their respective outputs. The cells give the current and voltage as output whereas the phototubes work on the low range of radiations and give other electrical signals.
(d)
Interpretation:
The difference between the use of the photodiodes and the photomultiuplier tubes is to be explained.
Concept introduction:
The photodiodes as well as the photomultiplier tubes both make use of the light signals incident on them and produce the required electric signal as per their use.
(e)
Interpretation:
The difference between use of the double beam in space and double beam in time spectrophotometers is to be explained.
Concept introduction:
The both spectrophotometers make use of the two beams from the source and these beams are divided and transmitted by using a beam splitter.
(f)
Interpretation:
The difference between the spectrophotometers and the photometers is to be explained.
Concept introduction:
The photometers and the spectrophotometer are used to determine the spectrum of the radiations, and they are different from each other in terms of wavelength selector used in them.
(g)
Interpretation:
The difference between the single beam and double beam instruments for absorbance measurements is to be explained.
Concept introduction:
The single beam and double beam instruments for absorbance measurements make use of the intensity of the light to measure the absorbance.The double beam instrument makes use of the two beams whereas the single beam make use of single beam.
(h)
Interpretation:
The difference between the conventional and the multichannel spectrophotometers is to be explained.
Concept introduction:
The multichannel spectrophotometers take only a second to record the full spectrum, whereas, the conventional spectrophotometers may take even minutes to record a single spectrum.
Trending nowThis is a popular solution!
Chapter 13 Solutions
Principles of Instrumental Analysis
- A Dubosq colorimeter consists of a cell of fixed path length and a cell of variable path length. By adjusting the length of the latter until the transmission through the two cells is the same. the concentration of the second solution can be inferred from that of the former. Suppose that a plantdye of concentration 25 μg dm-3 is added to the fixed cell. the length of which is 1.55 em. Then a solution of the same dye. but of unknown concentration. is added to the second cel l. It is found that the same t ransmittance is obtained when the length of the second cel l is adjusted to 1.18 em. What is the concentration of the second solution?arrow_forwardDescribe the principle and operation of anodic stripping voltammetry (ASV). How does it differ from adsorptive stripping voltammetry? What is the quantitative signal?arrow_forwardWould you use a tungsten or a deuterium lamp as a source of 300-nm radiation?arrow_forward
- What are the basic differences between absorption & adsorption, and sorption?arrow_forward2 Describe the primary barrier towards the broad adoption of FT-IR in the mid-20th century.arrow_forwardDetermine the appropriate LED colour and wavelength range that should be used tomeasure the absorbance of red, blue and yellow dye solutions. I think it has something to do with complimentary colours but im not surearrow_forward
- Provide an explanation of the effects which are responsible for the three absorbances profile in relation to the height of the burner. Figure below shows the absorbance profile of the three elements.arrow_forwardGive some of the application of Coloumetry, Potentiometey, Electrogravimetry and Voltammetry in different fields.arrow_forwardState the difference between transmittance, absorbance, and molar absorptivity. Which one is proportional to concentration?arrow_forward
- List and describe all advantages of XRF and NAA techniquesarrow_forward1) Compare the techniques of open-path FTIR versus extractive FTIR using gas cells for the analysis of gaseous compounds. Contrast the difference in their instrumentation and analytical procedures and briefly state the analytical applications of each method 2) A Chromophore is___________ 3) The X-ray microanalysimicro analysis technique in a scanning electron microscope involves the transitions of___ 4) What are the radiation sources for Infrared and Near Infrared spectra 5) A typical source for Raman spectroscopy is________arrow_forwardA compound with formula weight 280 transmitted 65% of the radiation at a certain wavelength in a 2-cm cell at a concentration of 15 microg/ml. Calculate its molar absorptivity at the wavelength. Answer should be in mol-1cm-1, in four significant figuresarrow_forward
- Principles of Instrumental AnalysisChemistryISBN:9781305577213Author:Douglas A. Skoog, F. James Holler, Stanley R. CrouchPublisher:Cengage LearningChemistry for Engineering StudentsChemistryISBN:9781285199023Author:Lawrence S. Brown, Tom HolmePublisher:Cengage Learning