Ion xaiv electrode yog ib qho electrochemical sensor uas nws lub peev xwm yog linear nrog logarithm ntawm ion kev ua ub no hauv ib qho kev daws teeb meem. Nws yog ib hom electrochemical sensor uas siv membrane peev xwm los txiav txim siab ion kev ua ub no lossis kev sib sau ua ke hauv cov tshuaj. Nws yog rau membrane electrode,leej twg Lub hauv paus tseem ceeb yog daim nyias nyias ntawm lub electrode. Txoj kev xaiv ion electrode yog ib ceg ntawm kev tshuaj xyuas potentiometric. Nws feem ntau yog siv rau hauv txoj kev potentiometric ncaj qha thiab potentiometric titration. Tus qauv siv tau zoo yog tus yam ntxwv hauv nws wide daim ntawv thov ntau yam. Ntxiv mus, it tuaj yeem ntsuas qhov concentration ntawm cov ions tshwj xeeb hauv cov tshuaj. Ntxiv rau qhov ntawd, kuvt tsis cuam tshuam los ntawm lubxim thiab qhov tsis meej thiab lwm yam tseem ceeb ntawm cov tshuaj reagent.
Cov txheej txheem ntsuas ntawm cov electrode xaiv ion
Thaum cov ions ntsuas tau hauv cov kua electrode kov lub electrode, kev tsiv teb tsaws chaw ntawm ion tshwm sim hauv cov dej ntawm cov ion selective electrode membrane matrix. Muaj lub peev xwm hauv kev hloov pauv ntawm cov ions tsiv teb tsaws chaw, uas hloov lub peev xwm ntawm cov nto membrane. Yog li, qhov sib txawv ntawm lub peev xwm tau tsim ntawm lub electrode ntsuas thiab lub electrode siv. Nws yog qhov zoo tagnrho uas qhov sib txawv ntawm lub peev xwm tsim ntawm ion selective electrode thiab cov ions uas yuav tsum ntsuas hauv cov kua yuav tsum ua raws li Nernst equation, uas yog
E=E0+ log10a(x)
E: Kev ntsuas peev xwm
E0: Lub peev xwm electrode txheem (tsis tu ncua)
R: Cov roj tas li
T: Kub
Z: Ionic valence
F: Faraday tas mus li
a(x): kev ua haujlwm ntawm cov ion
Nws tuaj yeem pom tias qhov ntsuas electrode muaj peev xwm yog proportional rau logarithm ntawm kev ua ub no ntawm "X" ions. Thaum tus coefficient kev ua ub no tseem tsis hloov pauv, qhov electrode muaj peev xwm kuj yog proportional rau logarithm ntawm qhov concentration ntawm ion (C). Ua li no, qhov kev ua ub no lossis concentration ntawm ions hauv cov tshuaj tuaj yeem tau txais.
Lub sijhawm tshaj tawm: Lub Ib Hlis-30-2023