Kev tshuaj xyuas cov teeb meem tshwm sim hauv kev siv cov pH meter electrodes muaj kev lag luam
Cov nyhuv ntawm qhov kub thiab txias ntawm iav Electrode
1. Nws tuaj yeem pom los ntawm kev qhia ntawm lub zog electromotive ntawm thawj lub roj teeb uas lub peev xwm electrode yog proportional rau cov tshuaj kub. Nyob rau hauv qhov kub thiab txias ntawm lub electrode calibration, feem ntau nws muaj peev xwm yuav compensated nyob rau hauv lub converter tawm tswv yim Circuit Court los ntawm kub electrode (pt100 los yog pt1000).
2. Cov iav electrode muaj qhov ua haujlwm siab sab hauv (kev lag luam iav electrode tsis kam yog feem ntau tsawg dua 500MΩ), nws qhov loj me tsis yog tsuas yog cuam tshuam nrog kev sib xyaw thiab tuab ntawm iav zaj duab xis, tab sis kuj muaj feem xyuam rau qhov kub thiab txias (kev sib raug zoo, txhua zaus qhov kub poob los ntawm 10 ° C, qhov kev tiv thaiv tus nqi kwv yees li ob npaug).
3. Qhov kub thiab txias yuav txhawb qhov kev sib cais ntawm cov dej soluble nyob rau hauv cov hydration txheej nyob rau saum npoo ntawm cov iav rhiab heev, uas yuav cuam tshuam rau lub peev xwm ntawm electrode thiab ua rau lub hnub nyoog electrode. Nws lub voj voog kev laus nyob ntawm qhov nruab nrab muaj pes tsawg leeg thiab kub. Hauv tib qhov nruab nrab, nws xav tias lub voj voog ua haujlwm yog 100 feem pua ntawm 25 degree, 20 feem pua ntawm 80 degree, thiab tsuas yog 5 feem pua ntawm 120 degree.
Cov nyhuv ntawm qhov kub thiab txias ntawm Reference Electrode
1. Nyob rau hauv cov ntaub ntawv ntawm ambient kub, KCl crystallization feem ntau yuav tshwm sim nyob rau hauv lub flow-type rechargeable reference electrode (sau nrog saturated KCl tov), uas ua rau lub unstable kua hlws ris muaj peev xwm ntawm cov siv electrode; Nyob rau tib lub sijhawm, cov crystallization tuaj yeem thaiv cov ceramic nyob hauv qab ntawm cov electrode Lub plug tiv thaiv cov electrolyte los ntawm kev nkag mus rau hauv kev ntsuas kev daws teeb meem thiab thaiv cov kab hluav taws xob.
2. Calomel electrodes yog qhov raug rau qhov kub thiab txias thiab yuav tsum tau zam nyob rau hauv kev tshaj tawm nrog kub kub los yog kub hloov pauv loj, thaum nyiaj-silver chloride electrodes tuaj yeem ua haujlwm ntawm qhov kub thiab txias dua.
Kev cuam tshuam ntawm micro-osmotic siab ntawm ntws siv electrode
Ceramic plug nyob rau hauv qab ntawm qhov siv electrode ua rau ib nrab impedance ntawm txoj kev hluav taws xob. Thaum qhov impedance no ntau dua 0.1MΩ, nws yuav ua rau cov khoom siv hluav taws xob tsis ruaj khov lossis tsis muaj zog. Cov xov xwm qias neeg heev ua rau lub ntsej muag electrode thiab thaiv cov ntsaws ntsaws ceramic. tus
Rau cov dej siv 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 lub siab los yog concentration ntawm qhov nruab nrab yog siab, lub rehydration channel tsis du, los yog muaj huab cua npuas, thiab lwm yam, nws yuav cuam tshuam lub extravasation ntawm cov electrolyte thiab ua rau kom lub intermediate impedance ntawm txoj kev hluav taws xob. Yog tias qhov nruab nrab thim rov qab rau hauv cov electrode, nws yuav ua rau cov ntsev ntsev thiab tej zaum yuav muaj tshuaj lom neeg nrog cov electrolyte lossis cov electrode sab hauv (piv txwv li: AgCl ntxiv sulfide → Ag2S) los ua rau cov tshuaj lom electrode.
Cov nyhuv ntawm pH ntawm kev daws ntawm electrodes
Cov iav electrode tsis muaj kev sib raug zoo sab nraum pH2 ~ pH9, thiab nws yog ib qho yooj yim los tsim ib tug loj npaum li cas ntawm hydronium ions H3 ntxiv rau O nyob rau hauv ib tug muaj zog acid tov, thiaj li hais tias tus naj npawb ntawm H ntxiv mus txog lub electrode nto yog kuj txo. , thiab tus nqi pH nce. Na ntxiv rau hauv qhov nruab nrab muaj zog alkaline tseem yuav koom nrog cov txheej txheem sib pauv ntawm H ntxiv rau hauv kev daws teeb meem thiab H ntxiv rau ntawm electrode hydration txheej, uas ua rau muaj peev xwm ntawm cov iav electrode thiab pH tsawg.
Tsis tas li ntawd, 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 electrode lom. Kev tiv thaiv cov kua qaub electrode tuaj yeem raug xaiv, thiab cov kev ntsuas tshwj xeeb (tshwj xeeb ntxiv ion mis) tau txais los ntawm cov txheej txheem tsim khoom tau txhim kho lub peev xwm los tiv thaiv acidosis ntawm iav daim nyias nyias, thiab tib lub sijhawm, xoom lub peev xwm ntawm cov electrode sib raug. mus rau pH 0=2, kom cov linearity nyob rau hauv cov kua qaub ntau yuav tau. Kev kho.
Kev ua ntawm rhiab iav membranes
Thaum tus nqi pH ntawm cov tshuaj nyob rau hauv lub iav electrode yog sib npaug rau pH tus nqi ntawm cov txheej txheem txheej, qhov sib txawv ntawm ob sab ntawm iav daim nyias nyias yuav tsum xoom, tab sis qhov tseeb muaj ib qho asymmetric peev xwm Ea, thiab nws qhov loj me. muaj feem xyuam rau cov muaj pes tsawg leeg, thickness thiab ntau lawm tej yam kev mob ntawm lub iav. Tom qab muab cov iav electrode tso rau hauv dej distilled los yog acidic tov (0.1N dilute hydrochloric acid) rau 24 teev, ib txheej hydration yuav tsim nyob rau saum npoo ntawm cov iav daim nyias nyias, yog li ntawd zoo heev txo Ea, thiab cov electrode nyob rau hauv. lub xeev active lub sij hawm no. Raws li txoj cai, thaum Ea loj, nws yog hu ua electrode aging. Txhawm rau ua kom qhov ntsuas tau raug, lub iav electrode yuav tsum tau qhib ua ntej siv, thiab yuav tsum tau ua kom nquag plias thaum siv.
