Kev tu thiab siv cov lus qhia ntawm ph meter
1. Cia ntawm pH 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
Cov iav electrode qhov muag tsis pom kev tuaj yeem ua rau lub sijhawm teb 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. Kev kho cov iav electrode aging
Kev laus ntawm cov iav electrode yog cuam tshuam nrog kev hloov pauv ntawm cov kua nplaum txheej txheej. 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 tsis tu ncua tshem tawm cov nplaum nplaum sab hauv thiab sab nrauv, lub neej ntawm electrode yuav luag tsis txwv.
4. Cia khoom siv electrode
Qhov zoo tshaj plaws cia tshuaj rau cov nyiaj-nyiaj 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 hauv kev ua haujlwm. Txoj kev no kuj tseem siv tau rau kev khaws cia ntawm cov khoom siv electrodes.
5. Regeneration ntawm qhov siv electrode
Feem ntau ntawm cov teeb meem ntawm kev 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 tsau nrog cov dej ntshiab ammonia. 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 siv nws ntxiv.
(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 uas ntim rau hauv qhov nqus tau dhau los ntawm cov kua hlws ris kom tshem tawm cov khoom thaiv.
(4) Kev sib txuas ua kua ua kua: Cov kua dej sib txuas ntawm cov nyiaj-silver chloride siv electrode yog raus hauv dej npau npau li 10-20 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 hlws ris thiab ua rau cov ntsaws ruaj ruaj.
siv pH meter
1. Tshem cov electrode tawm ntawm cov tshuaj tiv thaiv electrode, yaug kom huv si, qhuav nrog cov ntawv tsis muaj plua plav thiab muab tso rau hauv cov tshuaj uas yuav tsum tau kuaj (cov tshuaj yuav tsum tsis txhob dhau los ntawm electrode npuas), nias lub zog khawm tig rau pH meter, thiab pH meter yuav cia li nkag mus rau qhov ntsuas interface, thiab tom qab ntawd nias lub pob " ntsuas txuag / luam tawm", thiab tos kom nyeem ntawv kom ruaj khov ua ntej nyeem ntawv.
2. Tom qab siv lub ntsuas pH, yaug cov electrode thiab qhuav nrog cov ntawv tsis muaj plua plav, thiab tag nrho tsau rau hauv cov tshuaj tiv thaiv electrode. Cov tshuaj tiv thaiv electrode yuav tsum tau hloov nyob rau hauv lub sij hawm, ib zaug ib lub lim tiam.
