Dab tsi yog qhov sib xyaw ua ntej hauv kab chromatography?
Dab tsi yog qhov sib xyaw ua ntej hauv kab chromatography?

Video: Dab tsi yog qhov sib xyaw ua ntej hauv kab chromatography?

Video: Dab tsi yog qhov sib xyaw ua ntej hauv kab chromatography?
Video: Npau Suav li no Txhob coj mus tham qhia luag lwm tus 2024, Kaum ib hlis
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Cov kuab tshuaj tsawg-polar yog ua ntej siv rau lus tsawg-polar compound . Ib zaug tsawg-polar compound yog tawm ntawm kem , ib qho ntxiv-polar hnyav ntxiv rau hauv kem rau lus qhov ntau-polar compound.

Tsis tas li lo lus nug yog, lub ntsiab lus twg yuav elute ua ntej?

1 Cov Lus Teb. Ib tug qaug zog polar solvent yuav nyiam lus tsawg polar molecules ua ntej . Yog li, hexane yuav tej zaum yog tus ua ntej ua eluted , vim alkanes yog me ntsis tsawg dua polar dua alkenes.

nyob rau hauv dab tsi kev txiav txim yuav cov tebchaw elute los ntawm ib kem nyob rau hauv kem chromatography? Yog cov no tshuaj sib xyaw raug cais los ntawm kab chromatography ntawm silica gel, dab tsi yuav ua tus elution xaj ? (top - los ntawm kem ua ntej, hauv qab - los ntawm kawg). Raws li kuv tau txais, kab chromatography zoo li TLC qhov twg hauv silica gel tsis muaj polar compound los ua ntej.

Tsis tas li ntawd, qhov kev txiav txim ntawm elution yog dab tsi?

Yog li kev txiav txim yog cov xaj tias cov tshuaj tawg no tawm hauv GC kem. Piv txwv li C4 tshuaj xws li Isobutane feem ntau yuav " lus "ua ntej C8 zoo li Toluene.

Dab tsi yog qhov sib xyaw ua ke ntau dua hauv kab chromatography?

Lub xiav compound yog obviously ntau polar dua li cov xim daj - nws tej zaum txawm tias muaj peev xwm ua rau hydrogen daim ntawv cog lus. Koj tuaj yeem qhia qhov no vim xiav compound tsis taug kev los ntawm kem sai heev. Qhov ntawd txhais tau tias nws yuav tsum adsorb ntau ntseeg tau mus rau silica gel los yog alumina dua li daj.

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