Flame photometry can be used for the measurement of elements which can easily be excited like Ca, K, Na, Ba, Cu etc. However due to low temperature of flame the elements like Fe can not be excited and hence not measured using Flame photometry.
NOTHING 2. If the fluid contained some element, e.g. sodium or calcium, then the flame would show the colour appropriate to that element. Flame photometry relies on this principle.
to identify an unknown sample by its emission spectrum
this technique is used for the determination of sodium potassium and lithium (in case of Lithium therapy) in biological specimens received in laboratories
The colors in the flame test depends on the specific emission lines of a chemical element.
The color of the flame depends on the temperature, fuel nature, composition of particles in the flame, oxygen concentration.
flame photometry involves the determination of concentration of alkali and alkaline earth metals present in a sample based on the radiation emitted by it when the sample is atomized to a flame
Because the sodium concentration is too high, out of the determination range of the instrument.
Examples: emission spectrometry, flame photometry, atomic absorption, etc.
flame photometry is a type of atomic EMISSION spectroscopy. The sample is excited (raised to a high temperature), causing the emission of light. the wavelength of the emitted light is a function of the energy of the excited electrons, so each element has a characteristic set of wavelengths. usually a single wavelength is detected and the intensity of the emission is used to calculate concentration. Atomic adsorption works in the reverse way. A light of a standard wavelength (a wavelength characteristic of the target element) is passed through a flame containing the unknown substance, and the concentration of the target element is determined by the reduction in the energy of this light as it passes through the flame. the light is adsorbed by the electrons in the target element, kicking them into a higher orbit or completely out of the atom, depending on the energy involved. basically, one method involves the emission of the energy as an excited electron kicks back down to a lower state, and the other involves the adsorption of energy as an electron is kicked up an energy state. Same basic principle-change in electron energy relates to light of a specified wavelength and the change in the amount of that light can be measured and converted to a concentration.
Flame photometry is used in water analysis for determining the concentration of alkali metals. A liquid sample to be analysed is sprayed into a flame where the water evaporates, leaving the inorganic salts behind as a minute particles. The salts decompose into constituent atoms and become vaporised. The vapours containing the metal atoms are excited by the thermal energy of the flame and this causes the electrons to be raised to a higher energy level and they give off discrete amounts of radiant energy. The emitted radiation is passed through a prism which separates the various wavelengths so that the desired region can be isolated. And then a photocell and an amplifier is used to measure the intensity of the isolated radiation. The emission spectrum for each metal is different and its intensity depends on the concentration of atoms in the flame.
alkali earth , alkali,transational and other elements including C,S,As etc
Two common methods are atomic absorption spectrophotometry and flame photometry.
Roland. Herrmann has written: 'Flammenphotometrie' -- subject(s): Flame photometry
potassium (K) produces a blueish purple flame
NOTHING 2. If the fluid contained some element, e.g. sodium or calcium, then the flame would show the colour appropriate to that element. Flame photometry relies on this principle.
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.
The emission spectrum of an element