1. Give at least five differences between AAS and OES.
2. Summarize the differences and similarities between Flame OES and Furnace (Electrical & Plasma) OES.
| AAS | OES |
| it is an analytical technique used to measure wide range of element concentration in sample. the free atoms of tyhe sprayed element solution absorb the radiation of hollow cathode lamp of analysed element. | It is a multi element sampling technique. dissociate a sample into its constituent atoms and ions and exciting them to higher level. cause them to emit light at a characteristic wave length, which will be analysing. |
| the amount of light absorbed is proportional to the concentration of elent to be determined | the intensity of the emission indicates the concentration of element within the sample. |
| the principle process is absorption that consumes a photon and puts atoms in an excited state. | the principle process is emission that creates a photon and takes atom in an excited state to the ground statet |
| single element analysis is possible | multi element analysis is possible. |
| one report for each element | one report for all results. |
2.OES is a analytical technique for elemental analysis of silid mettallic samples.
flame OES is a method of chemical analysis that uses intensity of light emitted from flame at a particular wave lenghth to determine quantity of element. intensity of emitted light is proportional to no: of atoms. only liquid samples can be used.
ICPOES uses quantitative measurements of otical emission from excited atoms to determine analyte conc:. it uses inductively coupled plasma to produce excited atoms or ions that produce EM radiation corresponding to a paricular element.. samples may be solid, aqueous or organic solvent.
1. Give at least five differences between AAS and OES. 2. Summarize the differences and similarities...
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