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What is the sensitivity for Flame Atomic Emission Spectroscopy?
Wiki User
∙ 11y ago
The atomic absorption spectrometer requires that the sample be atomized, broken down into individual atoms, before it is passed into the radiation beam for absorbance measurement. In flame AA, a liquid solution containing the sample is aspirated into a flame. This is achieved using a nebulizer, which mixes the sample solution with gaseous fuel and oxidant to form a uniformly mixed aerosol of the solution. There are several different phenomena which take place in the flame while the measurement is occurring. Each drop first dries to a small salt particle, then evaporates completely. The ion clusters heat further until they absorb enough energy to dissociate into free atoms in vapor state. The beam is passed through the flame and absorbance by the atomized species in the flame is measured. It should be noted that the absorbance is proportional to the concentration of ground state atoms in the flame.
The flame provides a complex and reactive atmosphere. Metal atoms can undergo chemical changes, forming, for example, refractory oxides or hydroxides. Atoms can also lose electrons to form ions. Any process which converts free ground state atoms to other forms lowers the sensitivity because the ground state atoms are the absorbing species.
Figure .24 shows a typical AA flame apparatus. The burner usually has a long narrow slot from which the flame emerges, and the light beam passes along the length of the slot. This allows for a longer absorbing path length, and better sensitivity. A commonly used flame is fueled with acetylene, with air for an oxidizer
Wiki User
∙ 11y ago
Wiki User
∙ 11y agoThe F A E [photo] spectrometer is primarily sensitive to light via its light detector.
When a sample is passed through the machine, it is closely observed by the detector as it is deposited into a flame [- whose photon emission wavelengths are known in complete detail in advance so that these are eliminated as affecting the test results].
When the Sample meets the Flame the sample is combusted - and the fingerprint of the photons produced is so completely specific for any substance that Identification can be made.
Results depend upon the element being analyzed.
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Why is source modulation used in atomic absorption spectroscopy?
Source modulation is employed to distinguish between atomic absorption (an ac signal) and flame emission (a dc signal).
Can an AAA perform atomic emission spectroscopy?
Yes very easily - most if not all AA machines can be put in Flame Emmision mode
A list of situations in which flame emission spectroscopy is used?
Flame emission spectroscopy is commonly used in situations where the elemental composition of a sample needs to be determined. It is frequently employed in environmental monitoring to analyze trace elements in water and soil samples. It is also utilized in metallurgical and pharmaceutical industries, as well as in forensic analysis to identify the presence of specific elements in crime scene evidence.
What is atomic absorption spectrophotometry and what are its application in food?
Well, let me try to improve this answer a little... Atomic spectroscopy is, primarily, the science that investigates the interaction of electromagnetic radiation (such as X-rays, ultra-violet and visible light) with atoms, usually by means of absorption or emission. These principles of interaction can be combined in an instrument called "spectrometer" that, finally, can be used to quantify several elements of the periodic table in all kinds of sample that you can imagine, from water to rocks. This is usually done by associating the amount of energy absorbed or emitted by an atom or atom cloud to the quantity of atoms in a given sample (or, indirectly, to the concentration of the element in that sample). The most usual techniques associated to atomic spectroscopy are atomic absorprtion spectrometry, optical (or atomic) emission spectrometry and X-ray fluorescence spectrometry. Hope that helps... Atomic Spectroscopy is the determination of elemental composition by its electromagnetic or mass spectrum. Sorry if this wasn't the exact answer you're looking for, but it was the only thing I could find. It took me FOREVER to find the answer to this question for a school project I was doing. I hope this is what you need!!! >Smile< :-)
when is flame test used?
to identify an unknown sample by its emission spectrum
When is flame emission spectroscopy used?
It can be used for element identification and can used in Atomic spectroscopy and can be used to help "atoms with low ionization potentials become ionized."
Why is source modulation used in atomic absorption spectroscopy?
Source modulation is employed to distinguish between atomic absorption (an ac signal) and flame emission (a dc signal).
Can an AAA perform atomic emission spectroscopy?
Yes very easily - most if not all AA machines can be put in Flame Emmision mode
What are two ways to observe the emission spectra of a chemical?
The emission spectrum is the electromagnetic radiation spectrum of a particular chemical. The major ways this is observed is through special equipment designed for it, though flame emission spectroscopy is its own method, wherein burning a chemical produces a particular color of flame.
Why is atomic emission more sensitive to flame instability than atomic absorption fluorescence?
Answer- Flames in atomic emission are more sensitive to flame instability because optimum excitation conditions vary widely from element to element. High temperatures are needed for excitation of some elements and low temperatures for others. The region of flame that gives rise to optimum line intensities varies from element to element. Flame is rarely use in atomic emission because atomization is more complete when using a plasma due to the production of high temperatures. Also the plasma helps reduce the ionization interference effects. In flame absorption, after the sample is nebulized by a flow of gaseous oxidant, mixed with a gaseous fuel and carried into the flame it is then atomized. Then some of the atoms in the gas ionize to form cations and electrons. In flame emission the sample is introduce with argon, carries the sample into the flame. The flame is suppose to atomize the sample, while the flow of gas takes the ions and electrons to be detected.
Why is atomic absorption not used for qualitative analysis?
For one thing, atomic absorption equipment is basically a fancier version of flame emission equipment (I'm unaware of any instrument capable of doing AA that can't also do FE), and flame emission doesn't require you to change tubes every time you want to check for another element.
What analytical instruments can be used to identify the metal in a salt such as calcium carbonate?
Examples: emission spectrometry, flame photometry, atomic absorption, etc.
A list of situations in which flame emission spectroscopy is used?
Flame emission spectroscopy is commonly used in situations where the elemental composition of a sample needs to be determined. It is frequently employed in environmental monitoring to analyze trace elements in water and soil samples. It is also utilized in metallurgical and pharmaceutical industries, as well as in forensic analysis to identify the presence of specific elements in crime scene evidence.
Why is fluorescence a more sensitive technique than absorption?
Answer- Flames in atomic emission are more sensitive to flame instability because optimum excitation conditions vary widely from element to element. High temperatures are needed for excitation of some elements and low temperatures for others. The region of flame that gives rise to optimum line intensities varies from element to element. Flame is rarely use in atomic emission because atomization is more complete when using a plasma due to the production of high temperatures. Also the plasma helps reduce the ionization interference effects. In flame absorption, after the sample is nebulized by a flow of gaseous oxidant, mixed with a gaseous fuel and carried into the flame it is then atomized. Then some of the atoms in the gas ionize to form cations and electrons. In flame emission the sample is introduce with argon, carries the sample into the flame. The flame is suppose to atomize the sample, while the flow of gas takes the ions and electrons to be detected.
What is atomic absorption spectrophotometry and what are its application in food?
Well, let me try to improve this answer a little... Atomic spectroscopy is, primarily, the science that investigates the interaction of electromagnetic radiation (such as X-rays, ultra-violet and visible light) with atoms, usually by means of absorption or emission. These principles of interaction can be combined in an instrument called "spectrometer" that, finally, can be used to quantify several elements of the periodic table in all kinds of sample that you can imagine, from water to rocks. This is usually done by associating the amount of energy absorbed or emitted by an atom or atom cloud to the quantity of atoms in a given sample (or, indirectly, to the concentration of the element in that sample). The most usual techniques associated to atomic spectroscopy are atomic absorprtion spectrometry, optical (or atomic) emission spectrometry and X-ray fluorescence spectrometry. Hope that helps... Atomic Spectroscopy is the determination of elemental composition by its electromagnetic or mass spectrum. Sorry if this wasn't the exact answer you're looking for, but it was the only thing I could find. It took me FOREVER to find the answer to this question for a school project I was doing. I hope this is what you need!!! >Smile< :-)
What color flame does potassium ions produce in a flame emission photometer?
potassium (K) produces a blueish purple flame
What has the author Alastair Mark Reed written?
Alastair Mark Reed has written numerous fantasy novels, such as "Leaf and Flame" and "The Marches of the Mantii." He is known for creating intricate worlds with rich character development and engaging storylines. His works often explore themes of magic, power, and personal growth.
