Dab tsi yog vim li cas vim li cas pH meter electrodes tau yooj yim puas?
Ntau tus neeg siv khoom tau ntsib cov teeb meem zoo li no. Lub pH meter lawv siv ntawm qhov chaw yuav raug kev puas tsuaj electrode tom qab siv sijhawm luv. Qhov no tsis yog txhua yam uas cov chaw tsim khoom tau hais thaum nws siv rau lub sijhawm ntev. Nws puas yog tias cov electrode yog tsim los ntawm cov chaw tsim khoom? muaj teeb meem? Yog tias koj sim siv electrodes los ntawm lwm lub tuam txhab, qhov xwm txheej no kuj tshwm sim. Yuav ua li cas? Tom qab kev sib tham ceev faj, koj yuav pom tias qhov nruab nrab koj ntsuas tau tshuaj lom cov electrode.
Cov electrodes tam sim no tsim nyob rau hauv kev ua lag luam yog txaus siv pH meter electrodes. Qhov tsim ntawm cov hluav taws xob channel tso siab rau micro-osmotic siab ntawm cov electrolyte hauv cov electrode, tso cai rau cov electrolyte nkag mus rau hauv kev ntsuas ntsuas. Thaum qhov nruab nrab siab los yog concentration yog siab, lub rehydration channel tsis du, los yog muaj npuas, thiab lwm yam, nws yuav cuam tshuam lub extravasation ntawm cov electrolyte thiab ua rau kom muaj zog nyob rau hauv nruab nrab ntawm txoj kev hluav taws xob. Yog tias qhov nruab nrab thim rov qab nkag mus rau hauv pH meter electrode, nws yuav kis tau tus choj ntsev los yog txawm tias nws yuav hnov mob nrog cov electrolyte lossis sab hauv electrode (piv txwv li, AgCl sulfide → Ag2S) kom lom cov electrode.
Hauv qhov nruab nrab oxidizing muaj zog, qhov poob ntawm cov tshuaj alkaline (feem ntau yog monovalent cations) nyob rau hauv cov iav rhiab heev yuav ua rau cov hydration txheej thiab ua rau lom ntawm pH meter electrode. Acid-resistant pH meter electrodes tuaj yeem siv. Cov txheej txheem tshwj xeeb ntsuas (tshwj xeeb ion ntxiv mis) siv nyob rau hauv cov txheej txheem tsim txhim khu kev tiv thaiv ntawm iav daim nyias nyias rau acid lom. Nyob rau tib lub sijhawm, lub peev xwm xoom ntawm cov electrode sib raug rau pH 0=2, yog li ua rau cov kua qaub Linearity raug kho.
Lub pH meter electrode tsis muaj kev sib raug zoo sab nraud ntawm pH 2 txog pH 9, thiab nws yog ib qho yooj yim los tsim ib tug loj npaum li cas ntawm hydronium ions H3O nyob rau hauv muaj zog acidic daws, ua rau tus naj npawb ntawm H ntawm lub pH meter electrode. kom txo qis thiab nce tus nqi pH. Na nyob rau hauv ib tug muaj zog alkaline nruab nrab kuj yuav koom nyob rau hauv kev sib pauv txheej txheem ntawm H nyob rau hauv cov kev daws teeb meem thiab H nyob rau hauv lub hydration txheej ntawm electrode, ua rau lub electrode peev xwm ntawm pH meter nce thiab pH tus nqi qis.
