Ua lag ua luamKev lag luam

Gas chromatography. possibilities ntawm txoj kev

Gas chromatography - tsom xam txoj kev, tau txais ib tug zoo heev theoretical kev loj hlob. Hais tias ceev faj txoj kev tshawb no ntawm nws theoretical thiab cov tswv yim me nyuam yaus pab tshaj yav dhau los xyoo caum, lub ceev ceev txoj kev loj hlob ntawm cov txheej txheem no.

Nws yog lub npe hu hais tias roj chromatography txawv los ntawm lwm txoj kev nyob rau hauv uas cov roj siv nyob rau ntawd raws li lub mobile theem. Lub chaw theem yuav ua tau ib cov khoom los yog kua. Nyob rau hauv no qhia adsorption roj los yog roj-kua chromatography.

Qhov kev sib cais ntawm mixtures ntawm tshuaj nyob rau hauv pab kiag li lawm xws li ib tug roj chromatograph, yog vim lub heev repetition ntawm tus txheej txheem ntawm muab faib rau Cheebtsam ntawm lub ruaj ruaj kua los yog khoom theem thiab ib tug tsiv roj. Qhov kev sib cais yog raws li nyob rau hauv sib txawv nyob rau hauv volatility thiab cov solubility ntawm analytes. Ib tug tivthaiv, uas nws volatility ntawm ib tug muab kub ntau dua thiab tsawg tshaj li tus solubility ntawm lub ruaj ruaj theem yuav tsiv mus nyob hauv sab ceev.

Siv roj li cov cab kuj ntxuag tso cai rau kom muab tau zoo xws li kev sib cais ntawm constituent tshuaj clarity thiab ceev ntawm kev tsom xam. Test qauv yog nkag tau rau hauv cov kem nyob rau hauv gaseous daim ntawv los yog nyob rau hauv vapor daim ntawv. Nrog rau qhov no txoj kev nws yog ua tau rau kev tsom xam tsis tau tsuas yog gases tab sis kuj ua kua thiab khoom tshuaj, uas txhais rau hauv cov yam lub xeev los ntawm cov cua kub. Nyob rau hauv no hais txog, nyob rau hauv roj Chromatography lub ntsuas kub ntawm uas tag nrho cov txheej txheem, plays ib tug tseem ceeb heev luag hauj lwm. Performance txwv rau roj adsorption tsom xam txoj kev yog hom twg los ntawm 70 mus 600 ° C, thiab rau roj-kua - los ntawm 20 mus rau 400 ° C. Kev lag luam ua ib tug roj chromatograph, uas tso cai rau programming kub nyob rau hauv ua ntej.

Qhov no txoj kev yuav ua rau nws tau rau kev tsom xam ib yam khoom uas molecular yuag tsawg tshaj li 400. Lawv tsis decompose nyob rau evaporation, thiab tsis hloov lawv cov qauv nyob rau hauv lub tom ntej hws.

Mas nyob rau hauv lub analytical xyaum siv gas kua chromatography. Piv rau roj adsorption nws muaj ib co zoo, uas yog tsuas yog txuam nrog ib tug ntau ntawm cov tau nyob ruaj ruaj kua theem, thiab theem siab purity thiab hais tias yog heev tseem ceeb, nrog rau cov homogeneity kua ntau ntau.

Gas chromatography - ib tug ceev ceev txoj kev, yus muaj los ntawm siab raug, rhiab heev thiab muaj peev xwm rau automate. Lub versatility thiab yooj ntawm cov qauv siv los mus txiav txim ib tug cov ntaub ntawv tus ntaus ntawv. Gas chromatography uas ua hauj lwm rau ntau tsom xam muab unambiguous tau, uas tsis yog nyob rau hauv tsis ntseeg.

Qhov no txoj kev yuav daws tau ntau yam teeb meem analytical, sib faib thiab txiav txim seb tus piv ntawm kev sib txuas mus rau ib tug tsawg kawg nkaus ntawm chav siab. Ib tug qauv ntawm cov roj chromatography yog siv rau purification tshuaj, splitting mus rau hauv neeg lub Cheebtsam ntawm lub mixtures. Nws yog tshwj xeeb yog zoo nyob rau hauv qhov kev sib cais ntawm zoo xws li cov muaj pes tsawg leeg ntawm cov tshuaj uas yuav mus rau ib lub chav kawm: organic acids, alcohols, hydrocarbons.

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