Ion selective electrode yog ib qho electrochemical sensor uas nws lub peev xwm yog linear nrog lub logarithm ntawm ion kev ua hauv ib qho kev daws teeb meem. Nws yog ib hom electrochemical sensor uas siv cov membrane muaj peev xwm los txiav txim siab ion kev ua los yog concentration hauv kev daws. Nws belongs rau membrane electrode,nws Cov ntsiab lus tseem ceeb yog qhov pom ntawm daim nyias nyias ntawm electrode. Ion selective electrode method yog ib ceg ntawm kev txheeb xyuas potentiometric. Nws feem ntau yog siv rau hauv txoj kev ncaj qha potentiometric thiab potentiometric titration. Cov qauv siv hluav taws xob yog tus cwj pwm hauv nws wide thov ntau yam. Tsis tas li ntawd, it tuaj yeem ntsuas qhov concentration ntawm cov ions tshwj xeeb hauv cov tshuaj. Tsis tas li ntawd, it tsis cuam tshuam los ntawm tusxim thiab turbidity thiab lwm yam ntawm reagent.
Kev ntsuas txheej txheem ntawm ion xaiv electrode
Thaum ntsuas ions nyob rau hauv cov tshuaj electrode hu rau electrode, ion migration tshwm sim nyob rau hauv lub aquifer ntawm ion xaiv electrode membrane matrix. Muaj peev xwm nyob rau hauv tus nqi hloov pauv ntawm cov migrating ions, uas hloov lub peev xwm ntawm daim nyias nyias. Yog li, muaj peev xwm sib txawv ntawm qhov ntsuas electrode thiab cov khoom siv electrode. Nws yog qhov zoo tshaj plaws uas qhov sib txawv ntawm cov ion xaiv electrode thiab cov ions los ntsuas hauv cov tshuaj yuav tsum ua raws li Nernst equation, uas yog
E = E0 + log10a(x)
E: Ntsuas qhov peev xwm
E0: Txheem electrode muaj peev xwm (tsis tu ncua)
R: Gas tsis tu ncua
T: Kub
Z: Ionic valence
F: Faraday tas mus li
a(x): kev ua haujlwm ion
Nws tuaj yeem pom tau tias qhov ntsuas hluav taws xob muaj peev xwm yog proportional rau lub logarithm ntawm kev ua ntawm "X" ions. Thaum cov dej num coefficient tseem nyob tas li, lub peev xwm electrode kuj yog proportional rau lub logarithm ntawm ion concentration (C). Nyob rau hauv txoj kev no, qhov kev ua haujlwm lossis qhov concentration ntawm ions hauv cov tshuaj tuaj yeem tau txais.
Post lub sij hawm: Jan-30-2023