Dab tsi yog vim li cas vim li cas pH meter electrode puas yooj yim?
Ntau tus neeg siv khoom tau ntsib cov teeb meem zoo li no. Lub pH meter siv rau ntawm qhov chaw yuav puas tom qab lub sijhawm luv luv. Nws tsis yog tib yam li cov chaw tsim khoom tau hais tias lub sijhawm siv tau ntev heev. Puas yog cov electrode tsim los ntawm cov chaw tsim khoom? ib yam dab tsi tsis ncaj ncees lawm? Yog tias koj sim lwm electrode los ntawm lwm lub chaw tsim khoom, 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. Kev tsim cov kab hluav taws xob yog nyob ntawm qhov micro-osmotic siab ntawm cov electrolyte hauv cov electrode, kom cov electrolyte nkag mus rau hauv kev ntsuas ntsuas. Thaum lub nruab nrab siab los yog concentration siab, cov kua hloov channel tsis du, los yog muaj cua npuas, thiab lwm yam, tej zaum yuav cuam tshuam cov leakage ntawm cov electrolyte thiab ua rau kom lub intermediate impedance ntawm txoj kev hluav taws xob. Yog hais tias qhov nruab nrab rov qab mus rau hauv lub electrode ntawm pH meter, nws yuav ua rau cov ntsev ntsev los yog txawm tias nws yuav ua rau cov tshuaj tiv thaiv nrog electrolyte los yog cov electrode sab hauv (xws li AgCl sulfide → Ag2S) kom lom cov electrode.
Nyob rau hauv ib tug muaj zog oxidizing nruab nrab, qhov poob ntawm alkaline tshuaj (feem ntau monovalent cations) nyob rau hauv lub rhiab iav daim nyias nyias yuav ua rau lub hydration txheej thiab ua rau lom ntawm electrode ntawm pH meter. Ib qho acid-resistant pH meter electrode tuaj yeem xaiv. Cov txheej txheem tshwj xeeb ntsuas (tshwj xeeb ntxiv ion mis) tau txais los ntawm cov txheej txheem tsim khoom tau txhim kho lub peev xwm ntawm cov iav membrane kom tiv thaiv acidosis. Nyob rau tib lub sijhawm, lub peev xwm xoom ntawm cov electrode sib raug rau pH 0=2, kom cov Linearity raug kho.
Lub pH meter electrode tsis muaj kev sib raug zoo sab nraud ntawm pH2 ~ pH9, thiab nws yog ib qho yooj yim los tsim ib tug loj npaum li cas ntawm hydronium ions H3O nyob rau hauv ib tug muaj zog acidic tov, thiaj li hais tias tus naj npawb ntawm H nyob rau saum npoo ntawm pH meter electrode. txo qis thiab tus nqi pH nce. Na nyob rau hauv qhov nruab nrab muaj zog alkaline tseem yuav koom nrog hauv kev sib pauv ntawm H hauv kev daws teeb meem thiab H ntawm txheej electrode hydration, uas ua rau muaj kev nce hauv electrode peev xwm ntawm pH meter thiab tus nqi pH tsawg.
