Yog vim li cas rau pH meter electrode lom
Lub electrode ntawm cov dej siv pH meter tso siab rau micro osmotic siab ntawm cov electrolyte hauv cov electrode los ua ib qho hluav taws xob channel, tso cai rau cov electrolyte nkag mus rau hauv kev ntsuas ntsuas. Thaum lub siab los yog concentration ntawm qhov nruab nrab yog siab, lub replenishment channel tsis du, los yog muaj npuas tshwm sim, nws yuav cuam tshuam lub to ntawm electrolyte, ua rau kom impedance nyob rau hauv nruab nrab ntawm txoj kev hluav taws xob. Yog hais tias qhov nruab nrab infiltrates rov qab rau hauv pH meter electrode, nws yuav kis tau tus choj ntsev thiab txawm ua rau muaj tshuaj lom neeg nrog cov electrolyte los yog hauv electrode (xws li AgCl sulfide → Ag2S), ua rau electrode lom.
Hauv kev tawm dag zog oxidizing, kev poob ntawm cov tshuaj alkaline (feem ntau yog cov cations monovalent) hauv cov iav rhiab heev tuaj yeem ua rau cov hydration txheej thiab ua rau lom ntawm pH meter electrode. Acid resistant pH meter electrodes tuaj yeem xaiv, thiab cov txheej txheem tshwj xeeb ntsuas (tshwj xeeb ntxiv ntawm cov mis ion) yog siv rau hauv cov txheej txheem tsim los txhim kho cov tshuaj tiv thaiv acid toxicity ntawm iav zaj duab xis. Nyob rau tib lub sijhawm, lub peev xwm xoom ntawm cov electrode sib raug rau pH 0=2, yog li kho cov kab hauv cov kua qaub ntau.
Lub pH meter electrode tsis muaj kev sib raug zoo tawm sab nraud ntawm pH 2-pH 9, thiab nws nquag tsim los ntawm ntau cov hydrated hydrogen ions H3O hauv cov tshuaj acidic, uas ua rau cov txheeb ze txo qis. ntawm H rau saum npoo ntawm pH meter electrode thiab nce pH. Na nyob rau hauv muaj zog alkaline nruab nrab kuj koom nyob rau hauv kev sib pauv txheej txheem ntawm H nyob rau hauv cov kev daws thiab H nyob rau hauv lub electrode hydration txheej, uas ua rau ib tug nce nyob rau hauv electrode peev xwm thiab ib tug txo nyob rau hauv pH tus nqi ntawm pH meter.
