can any one tell me a website , a book or something else to help me to understand chromatography?
Start with Wikipedia for an overview then look thru their referecession for more books/sites.
Here are some sites that will explain chromatography: https://www.youtube.com/watch?v=ZCzgQXGz9Tg https://www.youtube.com/watch?v=SnbXQTTHGs4
Here is a site that will explain how it is used: https://www.khanacademy.org/test-prep/mcat/chemical-processes/separations-purifications/a/principles-of-chromatography
Here are some companies in Egypt that you can contact to explore more about chromatography: https://www.environmental-expert.com/companies/keyword-gas-chromatography-10433/location-egypt https://www.environmental-expert.com/training/keyword-chromatography-1312/available-in-egypt?redirectedToServing=1
Best of luck! Please let me know if and how this helps. Please keep me informed. I would like to follow your progress.