Dab tsi yog cov detectors ntawm roj chromatograph

Plaub lub cuab yeej siv ntau hauv cov roj chromatography yog thermal conductivity detector (TCD), hydrogen nplaim taws ionization detector (FID), electron capture detector (ECD), thiab nplaim taws photometric detector (FPD). Plaub lub detectors no txhua tus muaj lawv tus kheej cov yam ntxwv thiab daim ntawv thov ntau yam, uas yuav raug qhia nyias hauv qab no.
1, Thermal conductivity ntes (TCD)
Thermal conductivity detector yog ib hom kev ntes raws li lub hauv paus ntsiab lus ntawm thermal conduction, uas siv cov yam ntxwv sib txawv ntawm thermal conductivity ntawm cov khoom sib txawv los kuaj xyuas cov khoom hauv cov qauv. Thaum cov qauv nkag mus rau hauv lub ntes, nws dhau los ntawm kev sib pauv cua sov nrog cov hlau kub, ua rau muaj kev hloov pauv ntawm qhov kub ntawm cov hlau kub thiab tsim hluav taws xob teeb liab. Los ntawm kev ntsuas qhov loj ntawm lub teeb liab hluav taws xob, qhov concentration ntawm cov khoom hauv cov qauv tuaj yeem txiav txim siab.
Thermal conductivity detectors muaj qhov zoo ntawm cov qauv yooj yim, zoo stability, thiab siab rhiab heev, thiab yog li ntawd tau lug siv nyob rau hauv roj chromatographs. Nws yog qhov tsim nyog rau kev kuaj xyuas cov organic feem ntau thiab cov roj inorganic, tshwj xeeb tshaj yog nyob rau hauv thaj chaw ntawm kev tsom xam roj thiab kev saib xyuas ib puag ncig, thiab muaj qhov tseem ceeb ntawm daim ntawv thov.
2, Hydrogen nplaim taws ionization ntes (FID)
Lub hydrogen nplaim taws ionization ntes yog ib tug ntes raws li ionization hauv paus ntsiab lus, uas siv cov nplaim hluav taws uas tsim los ntawm combustion ntawm hydrogen thiab huab cua los ionize cov Cheebtsam nyob rau hauv cov qauv, yog li tsim ib tug hluav taws xob tam sim no teeb liab. Qhov loj ntawm lub teeb liab tam sim no yog ncaj qha proportional rau qhov concentration ntawm cov khoom hauv cov qauv, yog li qhov concentration ntawm cov khoom hauv cov qauv tuaj yeem txiav txim siab los ntawm kev ntsuas qhov loj ntawm lub teeb liab tam sim no.
Lub hydrogen nplaim taws ionization detector muaj qhov zoo ntawm siab rhiab heev, ceev teb, thiab ntau daim ntawv thov, thiab yog ib qho ntawm feem ntau siv detectors hauv roj chromatography. Nws yog qhov tsim nyog rau kev kuaj xyuas cov organic feem ntau, tshwj xeeb tshaj yog nyob rau hauv thaj chaw ntawm petrochemicals, kev saib xyuas ib puag ncig, thiab kev nyab xeeb ntawm zaub mov, thiab muaj ntau yam kev siv.
3, Electron Capture Detector (ECD)
Lub electron capture detector yog ib tug detector raws li lub hauv paus ntsiab lus ntawm electron capture, uas siv beta rays emissions los ntawm radioactive tshuaj (xws li ^ 63Ni) los cuam tshuam nrog cov khoom nyob rau hauv cov qauv, ua tsis zoo ions. Cov ions tsis zoo no raug ntes thiab ntsuas los ntawm qhov hluav taws xob hauv lub tshuab ntes, yog li tau txais cov ntaub ntawv qhia txog cov khoom hauv cov qauv.
Electron capture detectors muaj qhov zoo ntawm siab rhiab heev, siab xaiv, thiab tsis tshua muaj kev cuam tshuam keeb kwm yav dhau, ua rau lawv tshwj xeeb tshaj yog tsim nyog rau kev soj ntsuam cov organic tebchaw nrog electronegativity, xws li halogenated hydrocarbons thiab nitrogen-muaj cov tebchaw. Cov cuab yeej ntes hluav taws xob ua lub luag haujlwm tseem ceeb hauv thaj chaw xws li kev tshawb fawb ib puag ncig, tshuaj xyuas tshuaj, thiab tshuaj tua kab pov tseg.
4, Flame photometric detector (FPD)
Nplaim photometric detector yog ib tug detector raws li lub hauv paus ntsiab lus ntawm nplaim luminescence, uas siv lub luminescence tshwm sim ntawm tej yam lub caij atoms los yog ions nyob rau hauv cov nplaim taws ntawm tej wavelengths mus ntes cov Cheebtsam nyob rau hauv cov qauv. Thaum cov qauv nkag mus rau hauv lub ntes, nws hlawv nyob rau hauv ib tug hydrogen nplua nuj nplaim los tsim atoms los yog ions, uas emit teeb liab teeb liab ntawm tej wavelengths. Qhov concentration ntawm cov khoom hauv cov qauv tuaj yeem txiav txim siab los ntawm kev ntsuas qhov loj ntawm lub teeb liab.
Nplaim photometric detectors muaj qhov zoo ntawm qhov siab rhiab heev, kev xaiv siab, thiab cov lus teb ceev ceev, thiab tshwj xeeb tshaj yog tsim nyog rau kev kuaj xyuas qee cov ntsiab lus nrog cov khoom siv luminescent, xws li phosphorus, sulfur, thiab lwm yam. Flame photometric detectors ua lub luag haujlwm tseem ceeb hauv thaj chaw xws li petrochemicals. , kev saib xyuas ib puag ncig, thiab kev tshawb nrhiav geological.