Qee qhov kev paub txog pH electrode tu thiab tshuaj xyuas ntawm pH meter
Nrog rau kev siv dav siv pH ntsuas hauv ntau yam kev lag luam xws li kev lag luam, chaw kuaj mob, thiab kev lag luam teeb. Raws li hauv qab no, PH meter tau dhau los ua ib feem tseem ceeb ntawm kev tsim khoom thiab chaw soj nstuam. Nws tau hloov cov xwm txheej ntawm PH daim ntawv xeem hauv kev lag luam nrog cov yam ntxwv ntawm qhov system, ntsuas precision, thiab siab precision. Lub pH electrode yog qhov tseem ceeb ntawm pH meter. Hauv kev nkag siab, kev siv pH electrode tuaj yeem cuam tshuam ncaj qha rau kev siv pH meter. Yog li ntawd, peb yuav tsum xyuas kom meej tias pH electrode yog qhov qub thaum siv, yog li peb yuav tsum nkag siab kom raug Thiab siv cov pH electrode, thiab pH electrode yuav tsum tau tswj xyuas thiab kuaj txhua lub sijhawm. Tsuas yog nyob rau hauv txoj kev no, peb cov khoom yuav tsis tawg thaum siv.
(1) Kev saib xyuas ntawm pH electrode
1. Cia pH iav electrodes (feem ntau pH meters yog nruab nrog iav electrodes)
Lub sij hawm luv luv: khaws cia hauv cov tshuaj tsis haum nrog pH=4;
Lub sij hawm ntev: Khaws hauv cov tshuaj tsis haum nrog pH=7.
2. Kev ntxuav ntawm pH iav electrode. Kev ua qias tuaj ntawm lub teeb ntawm lub iav electrode tuaj yeem ua rau lub sijhawm teb ntawm electrode. Cov av tuaj yeem raug muab tshem tawm nrog CCl4 lossis tshuaj xab npum, thiab tom qab ntawd tsau hauv dej distilled rau ib hnub thiab hmo ntuj ua ntej siv txuas ntxiv. Thaum cov pa phem hnyav, nws tuaj yeem muab tso rau hauv 5 feem pua HF cov tshuaj rau 10-20 feeb, yaug nrog dej tam sim ntawd, thiab muab tso rau hauv 0.1N HCl tov rau ib hnub thiab hmo ntuj ua ntej siv txuas ntxiv. .
3. Iav electrode aging kho Kev laus ntawm iav electrodes muaj feem xyuam rau kev hloov maj mam hloov ntawm cov kua nplaum txheej qauv. Cov laus electrodes muaj cov lus teb qeeb, siab membrane tsis kam, thiab nqes qis. Etching tawm txheej txheej nplaum nrog hydrofluoric acid feem ntau txhim kho electrode kev ua tau zoo. Yog tias txoj kev no tuaj yeem siv tau los ua kom cov txheej txheej sab hauv thiab txheej txheej nplaum, lub neej ntawm electrode yuav luag tsis txwv.
4. Kev khaws cia ntawm cov khoom siv electrode Qhov zoo tshaj plaws cia tshuaj rau nyiaj-silver chloride electrode yog saturated potassium chloride tov. High-concentration potassium chloride tov tuaj yeem tiv thaiv cov nyiaj chloride los ntawm precipitating ntawm cov kua hlws ris thiab tswj cov kua hlws ris ntawm kev ua haujlwm. xeev. Txoj kev no kuj tseem siv tau rau kev khaws cia ntawm cov khoom siv electrodes.
5. Regeneration ntawm cov ntaub ntawv siv electrode Feem ntau ntawm cov teeb meem ntawm cov ntaub ntawv siv electrode yog tshwm sim los ntawm kev txhaws ntawm cov kua hlws ris, uas tuaj yeem daws tau los ntawm cov txheej txheem hauv qab no:
(1) Kev sib txuas ntawm cov dej so: siv cov tshuaj sib tov ntawm 10 feem pua saturated potassium chloride tov thiab 90 feem pua cov dej distilled, cua sov mus rau 60-70 degree, raus lub electrode txog 5cm, thiab tsau rau 20 feeb mus rau 1 teev. Txoj kev no tuaj yeem yaj cov crystals ntawm qhov kawg ntawm cov electrode.
(2) Ammonia soaking: Thaum cov kua hleb raug thaiv los ntawm cov nyiaj chloride, nws tuaj yeem soaked nrog cov concentrated ammonia dej. Txoj kev tshwj xeeb yog los ntxuav cov khoom siv hluav taws xob sab hauv, ntws cov kua dej thiab muab tso rau hauv dej ammonia rau 10-20 feeb, tab sis tsis txhob cia cov dej ammonia nkag mus rau hauv lub electrode. Tshem tawm cov electrode thiab ntxuav nws nrog dej distilled, thiab tom qab ntawd ntxiv cov kua filling dua thiab txuas ntxiv siv nws.
(3) Lub tshuab nqus tsev vacuum: muab lub hose nyob ib ncig ntawm cov kua hlws ris ntawm cov khoom siv electrode, siv lub tshuab nqus dej twj tso kua mis, thiab cov kua hauv qhov nqus tau dhau los ntawm cov kua hlws ris kom tshem tawm cov khoom thaiv.
(4) Kev sib txuas ua kua: Cov kua dej sib txuas ntawm cov nyiaj-nyiaj chloride siv electrode yog raus hauv dej npau npau li 10 mus rau 20 vib nas this.
Nco ntsoov tias cov electrode yuav tsum tau txias rau chav tsev kub ua ntej boil tom ntej.
(5) Thaum cov txheej txheem saum toj no tsis muaj txiaj ntsig, cov txheej txheem kev sib tsoo ntawm cov ntawv xuab zeb tuaj yeem siv los tshem tawm qhov txhaws. Txoj kev no yuav ua rau cov grit hauv kev sib tsoo kom ntsaws rau hauv cov kua sib txuas. ua rau muaj kev thaiv ib zaug.
(2) Kev tshuaj xyuas pH electrode
1. Kev soj ntsuam dav dav ntawm iav electrode
(1) Txheeb xyuas qhov tsis muaj peev xwm thiab teeb tsa pH ntsuas rau qhov ntsuas "mV" ntau yam. Ntxig lub iav electrode thiab cov ntaub ntawv siv electrode rau hauv cov tshuaj tsis muaj pH =6 86. Kev nyeem ntawv ntawm qhov ntsuas yuav tsum yog li -50~ 50mV.
(2) Tshawb xyuas txoj kab nqes: Txuas mus rau (1), tom qab ntawd ntsuas qhov mV tus nqi ntawm cov tshuaj tsis haum nrog pH=4.00 lossis pH =9.18, thiab xam qhov nqes hav ntawm lub electrode. Qhov txheeb ze txoj kab nqes ntawm cov electrode feem ntau yuav tsum tau ua ke nrog cov kev ntsuas ntsuas.
Daim ntawv ceeb toom:
1) Txoj kev kuaj xyuas tus nqi xoom muaj peev xwm ntawm electrodes tsuas yog rau iav electrodes nrog ib qho equipotential point ntawm 7. Yog hais tias lub equipotential point ntawm lub iav electrode tsis yog 7, nws yuav txawv.
2) Rau qee qhov pH ntsuas, yog tias qhov kev hloov pauv tuaj yeem ua tau raws li qhov yuav tsum tau ua, thiab cov txiaj ntsig kev soj ntsuam saum toj no tsis tawm ntawm qhov ntau, cov electrode tuaj yeem siv tau.
3) Rau qee cov pH ntse ntsuas, koj tuaj yeem xa ncaj qha mus rau xoom lub peev xwm thiab nqes nqes qhov tseem ceeb tau los ntawm kev ntsuas qhov ntsuas ntawm qhov ntsuas.
2. Kev tshuaj xyuas txoj kev siv electrode
(1) Internal resistance inspection method: Siv lub ntsuas ntsuas ntsuas. Ib qho kawg ntawm lub qhov (socket) electrode ntawm lub ntsuas hluav taws xob yog txuas nrog cov khoom siv hluav taws xob, thiab lwm qhov kawg yog txuas nrog cov hlau hlau. Cov ntaub ntawv siv electrode thiab cov hlau hlau yog immersed hauv cov tshuaj tib lub sijhawm. Kev tiv thaiv yuav tsum tsawg dua 10kΩ. Yog tias qhov kev tiv thaiv sab hauv loj dhau lawm, nws txhais tau hais tias cov kua hleb raug thaiv thiab yuav tsum tau ua nrog.
(2) Electrode tej zaum yuav check: coj ib tug zoo siv electrode ntawm tib tus qauv thiab cov ntaub ntawv siv electrode yuav tsum tau kuaj thiab txuas lawv mus rau lub input kawg ntawm lub pH meter, thiab ces ntxig rau KCl tov (los yog buffer tov nrog pH {{1}). }. Txwv tsis pub, cov ntaub ntawv siv electrode yuav tsum tau hloov lossis rov tsim dua tshiab.
(3) Kev soj ntsuam pom: cov nyiaj-nyiaj chloride xaim yuav tsum yog xim av tsaus, yog tias nws tawm-dawb, nws txhais tau hais tias cov nyiaj chloride tau yaj ib nrab.
