General Purpose Flame Photometer! The BWB XP is the first and only 5 channel flame photometerwith simultaneous detection and display of all 5 elements. The BWB XP was designed from the ground up, using new, innovative and modern technology to give unsurpassed levels of accuracy, usability and reliability while significantly reducing analysis time. Our customers do not need to waste valuable time changing filters and re-calibrating when a different measurement is required, as is a common requirement in all other Flame Photometer designs from to the present. The instrument has a large LCD display, which can be viewed easily from any angle.
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Optical system: The optical system consists of convex mirror and convex lens. The convex mirror transmits the light emitted from the atoms. Convex mirror also helps to focus the emissions to the lens.
The lens helps to focus the light on a point or slit. Simple colour filters: The reflections from the mirror pass through the slit and reach the filters.
Filters will isolate the wavelength to be measured from that of irrelevant emissions. Photo-detector: The intensity of radiation emitted by the flame is measured by photo detector. Here the emitted radiation is converted to an electrical signal with the help of photo detector. These electrical signals are directly proportional to the intensity of light. Working procedure Both the standard stock solution and sample solution are prepared in fresh distilled water.
The flame of the photometer is calibrated by adjusting the air and gas. Then the flame is allowed to stabilize for about 5 min. Now the instrument is switched on and the lids of the filter chamber are opened to insert appropriate colour filters. The readings of the galvanometer are adjusted to zero by spraying distilled water into the flame.
The sensitivity is adjusted by spraying the most concentrated standard working solution into the flame. Now the full scale deflection of the galvanometer is recorded. Again distilled water is sprayed into the flame to attain constant readings of galvanometer. Then the galvanometer is readjusted to zero. Now each of the standard working solutions is sprayed into the flame for three times and the readings of galvanometer are recorded.
After each spray, the apparatus must be thoroughly washed. Finally sample solution is sprayed into the flame for three times and the readings of galvanometer are recorded. Calculate the mean of the galvanometer reading.
Plot the graph of concentration against the galvanometer reading to find out the concentration of the element in the sample. The solvent is first aspirated to obtain fine solid particles.
These molecules in the solid particles are moved towards the flame to produce gaseous atoms and ions. These ions absorb the energy from the flame get excited to high energy levels from the ground state. But as these ions are unstable, they return back to ground state. While returning they emit characteristic radiation. The intensity of emitted light is proportional to the concentration of the element.
The oxidants in flame photometer are mainly air, oxygen or nitrous oxide. The temperature of the flame depends on the ratio of fuel and oxidant.
The processes occurring during flame photometer analysis are summarized below: Desolvation: Desolvation involves drying a sample in a solution. The metal particles in the solvent are dehydrated by the flame and thus solvent is evaporated.
Vaporization: The metal particles in the sample are also dehydrated. This also led to the evaporation of the solvent. Atomization: Atomization is the separation of all atoms in a chemical substance. The metal ions in the sample are reduced to metal atoms by the flame. Excitation: The electrostatic force of attraction between the electrons and nucleus of the atom helps them to absorb a particular amount of energy.
The atoms then jump to the higher energy state when excited. Emission: Since the higher energy state is unstable the atoms jump back to the ground state or low energy state to gain stability. This jumping of atoms emits radiation with characteristic wavelength. The radiation is measured by the photo detector. In other words, the intensity of emitted light is directly related to the concentration of the sample.
Applications of flame photometer Flame photometer can be applied both for quantitative and qualitative analysis of elements.
The radiations emitted by the flame photometer are characteristic to particular metal. Hence with the help of Flame photometer we can detect the presence of any specific element in the given sample. The presence of some group II elements is critical for soil health.
We can determine the presence of various alkali and alkaline earth metals in soil sample by conducting flame test and then the soil can be supplied with specific fertiliser. Their concentrations can be determined by diluting and aspirating blood serum sample into the flame. Soft drinks, fruit juices and alcoholic beverages can also be analysed by using flame photometry to determine the concentrations of various metals and elements.
The method of analysis is very simple and economical. It is quick, convenient, selective and sensitive analysis. It is both and qualitative and quantitative in nature. This method compensates for any unexpected interfering material present in the sample solution.
This method can be used to estimate elements which are rarely analysed. In spite of many advantages, this analysis technique has quite a few disadvantages: The accurate concentration of the metal ion in the solution cannot be measured.
It cannot directly detect and determine the presence of inert gases. Though this technique measures the total metal content present in the sample, it does not provide the information about the molecular structure of the metal present in the sample. Only liquid samples may be used. Also sample preparation becomes lengthy in some cases. Flame photometry cannot be used for the direct determination of each and every metal atom. A number of metal atoms cannot be analysed by this method. The elements such as carbon, hydrogen and halides cannot be detected due to their non-radiating nature.
BWB Model BWB-XP, 5 Channel Flame Photometer
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