Gas chromatography. Txoj kev muaj peev xwm

Gas chromatography. Txoj kev muaj peev xwm
Gas chromatography. Txoj kev muaj peev xwm

Video: Gas chromatography. Txoj kev muaj peev xwm

Video: Gas chromatography. Txoj kev muaj peev xwm
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Gas chromatography yog ib txoj hauv kev ntawm kev tshuaj xyuas uas tau txais kev txhim kho theoretical zoo heev. Nws yog kev ua tib zoo kawm txog nws cov theoretical thiab tswv yim lub hauv paus uas tau pab txhawb txoj kev loj hlob sai ntawm cov txheej txheem no nyob rau xyoo tsis ntev los no.

gas chromatography
gas chromatography

Nws paub tias roj chromatography txawv ntawm lwm txoj kev zoo sib xws hauv qhov uas nws siv roj raws li theem mobile. Cov theem nyob ruaj khov yuav yog ib qho khoom los yog kua. Nyob ntawm qhov no, ib tus hais txog roj-adsorption lossis roj-kua chromatography.

Kev sib cais ntawm cov khoom sib xyaw hauv cov khoom siv xws li roj chromatograph tshwm sim vim kev rov ua dua ntawm cov txheej txheem ntawm kev faib cov khoom nruab nrab ntawm cov kua dej nyob ruaj khov lossis cov theem ruaj khov thiab cov pa txav mus. Cov txheej txheem sib cais yog nyob ntawm qhov sib txawv ntawm volatility thiab solubility ntawm cov tshuaj ntsuam xyuas. Cov tivthaiv nrog qhov siab tshaj plaws volatility ntawm qhov muab qhov kub thiab qhov qis tshaj solubility ntawm cov theem nyob ruaj ruaj yuav txav nrawm dua los ntawm kab.

gas chromatograph
gas chromatograph

Kev siv roj raws li lub xov tooj ntawm tes muab qhov zoo xws liclarity ntawm kev sib cais ntawm constituent tshuaj thiab ceev ntawm tsom xam. Cov qauv kuaj tau nkag mus rau hauv kem hauv daim ntawv gaseous lossis vapor. Siv txoj kev no, nws muaj peev xwm txheeb xyuas tsis tau tsuas yog gases, tab sis kuj ua kua thiab khoom, uas yog pauv mus rau lub xeev yuav tsum tau los ntawm cua sov. Nyob rau hauv no hais txog, nyob rau hauv roj chromatography, qhov kub thiab txias ntawm tag nrho cov txheej txheem yuav siv sij hawm qhov chaw plays lub luag hauj lwm tseem ceeb heev. Kev txwv kev ua haujlwm rau cov roj-adsorption txoj kev tsom xam ntawm 70 txog 600 ° C, thiab rau cov roj-kua txoj kev - los ntawm 20 mus rau 400 ° C. Kev lag luam tsim cov roj chromatograph uas tso cai rau koj ua ntej qhov kev pab cuam kub.

Txoj kev no ua rau nws muaj peev xwm txheeb xyuas cov khoom uas nws qhov hnyav molecular tsawg dua 400. Lawv tsis decompose thaum lub sij hawm evaporation, thiab tsis txhob hloov lawv muaj pes tsawg leeg thaum lub sij hawm tom ntej condensation.

gas chromatograph
gas chromatograph

Feem ntau siv rau hauv kev tshuaj ntsuam xyuas yog roj-kua chromatography. Piv nrog rau cov roj adsorption, nws muaj qee qhov zoo, uas feem ntau cuam tshuam nrog kev xaiv dav ntawm cov dej ua haujlwm ruaj khov, nrog rau siab purity thiab, tseem ceeb heev, cov kua dej sib xws.

Gas Chromatography yog ib txoj hauv kev nrawm nrog qhov raug siab, rhiab heev thiab muaj peev xwm ua haujlwm. Lub versatility thiab yooj ntawm txoj kev no txiav txim siab cov cuab yeej siv nyob rau hauv ib tug tshwj xeeb rooj plaub. Gas chromatography, siv rau kev soj ntsuam kom muaj nuj nqis, muab cov txiaj ntsig tsis meej uas tsis muaj kev ntseeg siab.

Txoj kev no tso cai rau koj los daws ntau yamanalytical teeb meem, cais thiab txiav txim qhov piv ntawm cov tebchaw nrog qhov tsawg kawg nkaus qhov sib txawv ntawm vapor siab. Cov pa roj chromatography txoj kev yog siv los ntxuav cov tshuaj, faib cov khoom sib tov rau hauv ib tus neeg. Nws muaj txiaj ntsig tshwj xeeb hauv kev sib cais cov khoom sib xws uas muaj nyob hauv tib chav kawm: organic acids, cawv, hydrocarbons.

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