Sunday 30 December 2018

Gas chromatography . ppt-II

Argon ionization detector <ul><li>Depends on the excitation of argon atoms to a metastable state, by using radioactive ene...

<ul><li>ELECTRON CAPTURE DETECTOR </li></ul><ul><li>The detector consists of a cavity that contains two electrodes and a...
<ul><li>If a compound is present that contains electronegative atoms, those electrons are captured and negative ions are f...
 




 

 

<ul><li>ADVANTAGE </li></ul><ul><li>Highly sensitive </li></ul><ul><li>DISADVANTAGE </li></ul><ul><li>Used only for compo...

Derivatisation of sample <ul><li>Treat sample to improve the process of separation by column or detection by detector. </...

Post column derivatisation <ul><li>Improve response shown by detector </li></ul><ul><li>Components ionization / affinity...
Parameters used in GC <ul><li>Retention time (Rt) </li></ul><ul><li>It is the difference in time b/w the point of inje...
<ul><li>Separation factor (S) </li></ul><ul><li>Ratio of partition co-efficient of the two components to be separated. </...
Retention time
 

Separation factor

Resolution
Resolution

THEORETICAL PLATE <ul><li>An imaginary unit of the column where equilibrium has been established between S.P & M.P </li></...











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