Yuav ua li cas raus dej pH composite electrode?
Lub pH electrode yuav tsum tau ntub dej ua ntej siv, vim tias pH qhov muag teev yog cov iav tshwj xeeb. Muaj ib txheej gel nyias nyias ntawm cov iav membrane. Nws tuaj yeem muaj txiaj ntsig zoo ntawm hydrogen ion hauv cov tshuaj tsuas yog thaum nws ntub tag nrho. Lub caij no, soaking lub iav electrode tuaj yeem txo qhov peev xwm asymmetric thiab stabilize nws. PH iav electrodes feem ntau tuaj yeem tsau rau hauv cov dej distilled lossis cov tshuaj tsis haum nrog pH =4. Feem ntau nws yog qhov zoo dua rau soak hauv pH =4 tsis muaj tshuaj, nrog rau lub sijhawm so ntawm 24 teev lossis ntau dua, nyob ntawm qhov tuab ntawm cov npuas iav zaj duab xis thiab qib ntawm electrode aging. Nyob rau tib lub sijhawm, cov kua interface ntawm cov khoom siv electrode kuj yuav tsum tau ntub dej. Vim hais tias yog cov kua interface dries, cov kua interface tej zaum yuav nce los yog tsis ruaj khov. Cov kua dej ntawm cov khoom siv electrode yuav tsum ua raws li cov lus qhia sab nraud ntawm cov khoom siv electrode, uas yog, 3.3mol / L KCl tov lossis saturated KCl tov, thiab lub sij hawm soaking feem ntau yog ob peb teev.
Yog li ntawd, rau pH composite electrodes, lawv yuav tsum tau muab tso rau hauv pH =4 tsis muaj KCl nyob rau hauv thiaj li yuav ua tau ib txhij ntawm lub iav qhov muag teev thiab kua interface. Kev saib xyuas tshwj xeeb yuav tsum tau them rau ntawm no, zoo li yav dhau los, tib neeg tau siv los ntub ib qho pH iav electrodes hauv dej deionized los yog pH =4 pawg ntawm cov tshuaj yaug dej. Txawm li cas los xij, thaum siv pH sib xyaw electrodes, txoj kev ntub dej no tseem siv tau, thiab txawm tias cov lus qhia tsis raug tau muab rau hauv cov neeg siv phau ntawv ntawm qee cov pH electrodes. Qhov txiaj ntsig ncaj qha ntawm txoj kev ntub dej tsis raug no yog qhov pH sib xyaw electrode nrog kev ua haujlwm zoo dhau los ua cov lus teb qeeb thiab qhov tsis zoo ntawm cov electrode, thiab lub sijhawm ntub dej ntev dua, qhov ua tau zoo dua. Vim tias tom qab lub sijhawm so ntev, KCl concentration hauv cov kua sib txuas (xws li hauv cov xuab zeb core) tau txo qis heev, ua rau cov kua dej sib txuas tuaj yeem nce thiab tsis ruaj khov. Tau kawg, tsuav yog tias cov electrode tau muab tso rau hauv qhov dej kom raug rau ob peb teev, nws tseem yuav rov zoo.
Tsis tas li ntawd, pH electrodes tsis tuaj yeem muab tso rau hauv qhov nruab nrab lossis alkaline tsis daws teeb meem, vim tias kev nkag mus ntev hauv cov kev daws teeb meem no tuaj yeem ua rau pH iav zaj duab xis teb qeeb.
Kev npaj kom raug ntawm pH electrode soaking tov: Siv ib lub hnab ntawm pH =4 00 buffer (250mL), yaj nyob rau hauv 250mL ntawm cov dej ntshiab, ntxiv 56 grams ntawm cov ntshiab ntshiab KCl, cua sov kom tsim nyog, thiab do kom txog thaum yaj tag.
