Qhov sib txawv tseem ceeb ntawm potentiometry thiab amperometry yog tias potentiometry ntsuas lub peev xwm hluav taws xob thaum tswj cov hluav taws xob tas li ntawm ob lub electrodes, hos amperometry saib xyuas hluav taws xob tam sim no thaum ua kom lub peev xwm tas li.
Potentiometry thiab amperometry yog ib qho tseem ceeb analytical txheej txheem hauv analytical chemistry. Potentiometry yog ib txoj hauv kev ntawm electroanalysis siv los nrhiav cov concentration ntawm cov kuab tshuaj hauv cov tshuaj. Amperometry yog cov txheej txheem los kuaj xyuas cov ions hauv cov tshuaj nyob ntawm qhov hluav taws xob tam sim no lossis kev hloov pauv hauv hluav taws xob tam sim no.
Puas yog dab tsi?
Potentiometry yog ib txoj hauv kev ntawm electroanalysis feem ntau siv los nrhiav cov concentration ntawm cov kuab tshuaj hauv cov tshuaj. Nyob rau hauv lwm yam lus, peb ntsuas lub peev xwm ntawm ib tug electrochemical cell nyob rau hauv zoo li qub thaum lub sij hawm potentiometry. Qhov no yog vim hais tias tsis muaj los yog tsis pom zoo tam sim no ntws los ntawm electrochemical cell thaum nws muaj pes tsawg leeg tseem tsis hloov. Yog li ntawd, potentiometry yog qhov tseem ceeb heev raws li ib txoj hauv kev kom muaj nuj nqis.
Thaum pib, potentiometry raug txwv rau redox equilibria ntawm cov hlau electrodes, uas zoo li txwv nws daim ntawv thov rau ob peb ions. Tom qab ntawd, cov kws tshawb fawb tau tshawb pom tias qhov sib txawv ntawm cov iav nyias nyias tuaj yeem muab los ua ib qho kev ua haujlwm ntawm pH thaum sab nraud ntawm daim nyias nyias muaj kev sib cuag nrog cov kev daws teeb meem uas muaj qhov sib txawv hydronium ion concentrations.
Ib tug potentiometric electrochemical cell muaj ob ib nrab ntawm tes. Txhua ib nrab ntawm tes muaj cov khoom siv hluav taws xob uas tau muab tso rau hauv qhov kev daws teeb meem ntawm ions uas qhov kev ua ntawm ions txiav txim siab lub peev xwm ntawm cov electrode. Ntxiv mus, peb tuaj yeem siv tus choj ntsev uas muaj cov roj ntsha tsis zoo xws li potassium chloride los txuas ob lub hlwb ib nrab.
Amperometry yog dab tsi?
Amperometry yog cov txheej txheem ntawm kev tshawb pom cov ions hauv cov tshuaj nyob ntawm cov hluav taws xob tam sim no lossis cov nqi hluav taws xob tam sim no. Cov txheej txheem no muaj txiaj ntsig zoo hauv electrophysiology thaum kawm vesicle tso cov xwm txheej nrog kev siv cov pa roj carbon fiber electrode. Hauv kev sib piv rau cov txheej txheem patch-clamp, peb tsis ntxig cov electrode siv rau amperometry rau hauv lub cell. Txawm li cas los xij, peb yuav tsum coj nws mus ze ze ntawm lub cell. Tom qab ntawd, peb tuaj yeem tau txais qhov ntsuas los ntawm cov electrode los ntawm cov tshuaj tiv thaiv oxidizing ntawm lub vesicle cargo uas tso rau hauv nruab nrab. Xwb, peb tuaj yeem siv cov kev ntsuas capacitive.
Muaj ob txoj hauv kev tshawb pom loj ntawm amperometry: ib qho peev xwm amperometry thiab pulsed amperometry. Hauv ib lub peev xwm amperometry, peb siv ib qho kev ntsuas uas tuaj yeem ua rau oxidation lossis txo qis raws li tus neeg sib tw rau kev kuaj pom amperometric. Hauv pulse amperometry, peb siv nws rau cov tshuaj ntsuam xyuas uas zoo li foul electrodes.
Qhov txawv ntawm Potentiometry thiab Amperometry yog dab tsi?
Potentiometry yog ib txoj hauv kev ntawm electroanalysis feem ntau siv los nrhiav cov concentration ntawm cov kuab tshuaj hauv cov tshuaj. Amperometry yog cov txheej txheem ntawm kev tshawb nrhiav cov ions hauv kev daws teeb meem nyob ntawm cov hluav taws xob tam sim no lossis cov nqi hluav taws xob tam sim no. Qhov sib txawv tseem ceeb ntawm potentiometry thiab amperometry yog tias potentiometry ntsuas lub peev xwm hluav taws xob thaum tswj xyuas qhov hluav taws xob tas li ntawm ob lub electrodes, hos amperometry saib xyuas hluav taws xob tam sim no thaum ua kom muaj peev xwm tas li.
Ntxiv mus, potentiometry yog siv nyob rau hauv kev kho mob chemistry rau kev tsom xam ntawm hlau, tsom xam ntawm cyanides, ammonia, thiab lwm yam. Hauv cov dej khib nyiab, hauv kev ua liaj ua teb rau kev tshawb nrhiav cov ntsiab lus sib txawv hauv av, thiab lwm yam. Amperometry, ntawm qhov tod tes, yog siv rau hauv cov pa oxygen monitors lossis oxygen cathodes, titrations xws li redox, nag lossis daus thiab complexometric titrations, thiab lwm yam.
Cov lus hauv qab no qhia txog qhov sib txawv ntawm potentiometry thiab amperometry.
Summary – Potentiotry vs Amperometry
Potentiometry thiab amperometry yog ib qho tseem ceeb analytical txheej txheem hauv analytical chemistry. Qhov sib txawv tseem ceeb ntawm potentiometry thiab amperometry yog tias potentiometry ntsuas lub peev xwm hluav taws xob thaum tswj xyuas qhov hluav taws xob tas li ntawm ob lub electrodes, hos amperometry saib xyuas hluav taws xob tam sim no thaum ua kom muaj peev xwm tas li.
