pH meter tu teeb meem
kev saib xyuas
1. Cia ntawm pH iav electrode
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 kis kab mob ntawm cov iav electrode teeb yuav ua rau lub sij hawm teb electrode ntev. So cov av nrog CCl4 los yog xab npum, ces tsau rau hauv dej distilled rau ib hnub thiab hmo ntuj ua ntej siv txuas ntxiv. Thaum cov pa phem hnyav heev, nws tuaj yeem tsau rau hauv 5% HF tov rau 10 rau 20 feeb, yaug tam sim ntawd nrog dej, thiab muab tso rau hauv 0.1N HCl tov rau ib hnub thiab hmo ntuj ua ntej siv txuas ntxiv.
3. Kev kho cov iav electrode aging
Kev laus ntawm cov iav electrodes muaj feem xyuam nrog kev hloov pauv ntawm cov txheej txheem kua nplaum. Lub qub electrode muaj cov lus teb qeeb, siab membrane tsis kam, thiab qis nqes hav. Siv hydrofluoric acid kom tshem tawm cov nplaum txheej txheej tuaj yeem txhim kho electrode kev ua tau zoo. Yog tias txoj kev no tuaj yeem siv tsis tu ncua tshem tawm cov roj hmab sab hauv thiab sab nrauv, lub neej ntawm cov electrode yuav luag tsis txwv.
4. Cia khoom siv electrode
Qhov zoo tshaj plaws cia tshuaj rau cov nyiaj-nyiaj chloride electrodes 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 ua kom cov dej sib txuas ua haujlwm. Txoj kev no kuj tseem siv tau rau kev khaws cia ntawm cov khoom siv electrodes.
5. Regeneration ntawm siv electrode
Feem ntau ntawm cov teeb meem uas tshwm sim nrog kev siv electrode yog tshwm sim los ntawm clogging ntawm cov kua hlws ris, uas yuav daws tau los ntawm cov hauv qab no txoj kev:
(1) Soaking kua junction: Siv ib tug sib tov ntawm 10% saturated potassium chloride tov thiab 90% distilled dej, tshav kub 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 thiab tshem tawm cov muaju ntawm qhov kawg ntawm cov electrodes.
(2) Ammonia immersion: Thaum cov kua hleb raug thaiv los ntawm cov nyiaj chloride, nws tuaj yeem leached nrog cov dej ntshiab ammonia. Txoj kev tshwj xeeb yog ntxuav cov electrode, ntws cov kua thiab muab tso rau hauv dej ammonia rau 10 mus rau 20 feeb, tab sis tsis txhob cia ammonia nkag mus rau hauv cov electrode. Tshem tawm cov electrode, ntxuav nws nrog dej distilled, refill lub electrode thiab txuas ntxiv siv nws.
(3) Nqus txoj kev: Muab lub hose nyob ib ncig ntawm cov kua hlws ris ntawm cov ntaub ntawv siv electrode, siv lub twj tso kua mis dej ntws los nqus cov kua ib nrab los ntawm cov kua hlws ris, thiab tshem tawm cov khoom thaiv.
(4) Boiling kua hlws ris: Cov kua hlws ris ntawm cov nyiaj-silver chloride siv electrode yog immersed nyob rau hauv boiling dej 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 kev sib tsoo cov xuab zeb uas tau ntim rau hauv cov kua dej sib txuas. Ua rau muaj kev puas tsuaj.
tshuaj xyuas
1. Kev soj ntsuam dav dav ntawm iav electrodes
(1) Tshawb xyuas xoom muaj peev xwm
Teem lub ntsuas pH mus rau qhov ntsuas "mV", ntxig lub iav electrode thiab cov khoom siv hluav taws xob rau hauv cov tshuaj tsis haum nrog pH=686, thiab kev nyeem ntawv ntsuas yuav tsum yog kwv yees li {{2. }} ~ 50mV.
(2) Tshawb xyuas txoj kab nqes
Ua raws li (1), tom qab ntawd ntsuas tus nqi mV ntawm cov tshuaj tsis haum nrog pH=4.00 lossis pH=9.18, thiab xam qhov nqes ntawm cov electrode. Qhov txheeb ze txoj kab nqes ntawm cov electrode feem ntau yuav tsum tau ua ke nrog cov ntsuas kev ntsuas.
