Kev tshuaj xyuas qhov ua rau pH meter electrode lom
Rau cov dej siv pH meter electrodes, qhov tsim ntawm cov hluav taws xob raws yog nyob ntawm micro-osmotic siab ntawm cov electrolyte hauv 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 hais 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 acidosis. 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 tawm sab nraud ntawm pH 2 txog pH 9. Nws yog ib qho yooj yim los tsim ib tug loj npaum li cas ntawm hydronium ions H3+O nyob rau hauv muaj zog acidic daws, ua rau tus naj npawb ntawm H + nyob rau saum npoo. ntawm 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 electrode hydration txheej, ua rau lub pH meter electrode muaj peev xwm nce thiab ph tus nqi qis.
Ob-point calibration txoj kev ntawm pH meter
(1) Ntxuav thiab qhuav cov electrode, muab tso rau hauv pH6. Tom qab qhov taw qhia tus nqi ruaj khov, kho qhov chaw qhov rooj kom qhov ntsuas qhov ntsuas tus nqi yog pHs tus nqi ntawm cov qauv kev daws teeb meem.
(2) Tshem tawm cov electrode, ntxuav nws, tig nws qhuav, thiab muab tso rau hauv thawj txheej txheem tov. Tom qab qhov taw qhia tus nqi ruaj khov, kho txoj kab nqes pob qhov ntsuas qhov ntsuas kom ntsuas qhov ntsuas tus nqi yog pHs tus nqi ntawm thawj tus qauv kev daws teeb meem.
(3) Tshem tawm cov electrode, ntxuav nws thiab tig nws kom qhuav, thiab tom qab ntawd muab tso rau hauv pH6.86 lossis pH7.00 tsis muaj tshuaj. Yog tias qhov yuam kev dhau 0.02pH, rov ua cov kauj ruam (1) thiab (2) kom txog thaum pH raug tso tawm tuaj yeem pom hauv ob qho kev daws teeb meem yam tsis tau kho lub pob qhov rooj.
(4) Tshem tawm cov electrode thiab tig nws qhuav, kho pH kub them pob qhov rooj rau qhov ntsuas kub ntawm cov qauv tshuaj, raus cov electrode hauv cov qauv tshuaj, co nws thiab tso nws kom txog thaum kev nyeem ntawv ruaj khov.
