Kev ntub dej kom raug ntawm pH sib xyaw electrodes
Ua rau kev tsom xam: pH electrode yuav tsum tau ntub dej ua ntej siv, vim tias pH qhov muag teev yog cov iav tshwj xeeb. Muaj ib txheej nyias nyias hydrated gel rau saum npoo ntawm cov iav membrane. Nws tuaj yeem teb tau zoo rau H ions 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 dej distilled lossis pH 4 tsis muaj tshuaj. Feem ntau nws yog qhov zoo dua los siv pH 4 tsis zoo, nrog lub sijhawm so ntawm 8 mus rau 24 teev lossis ntev dua, nyob ntawm qhov tuab ntawm cov npuas iav zaj duab xis thiab qib ntawm electrode aging. Lub caij no, cov kua interface ntawm cov khoom siv electrode kuj yuav tsum tau ntub dej. Vim hais tias yog cov kua interface dries, nws 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.
Kev ntub dej ntawm pH composite electrode: Soak hauv pH 4 tsis muaj tshuaj uas muaj KCL, thiaj li ua rau tib lub sijhawm ua rau lub iav qhov muag teev thiab cov kua dej sib txuas. Kev saib xyuas tshwj xeeb yuav tsum tau them rau ntawm no, zoo li yav dhau los, tib neeg siv los ntub ib qho pH iav electrodes hauv dej deionized los yog pH 4 tsis. Txawm li cas los xij, txoj kev ntub dej no tseem siv tau thaum siv pH sib xyaw electrodes, thiab txawm tias cov lus qhia tsis raug yuav 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 hloov pauv pH sib xyaw electrode nrog kev ua haujlwm zoo rau hauv cov khoom siv hluav taws xob nrog cov lus teb qeeb thiab qhov tseeb tsis zoo, thiab lub sij hawm ntub dej ntev dua, qhov ua tau zoo dua. Qhov no yog vim hais tias tom qab ib tug ntev soaking lub sij hawm, lub concentration ntawm KCL nyob rau hauv cov kua interface (xws li nyob rau hauv cov xuab zeb core) tau poob zoo heev, uas ua rau ib tug nce thiab instability ntawm cov kua interface muaj peev xwm. 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 yuav tsum tsis txhob immersed nyob rau hauv nruab nrab los yog alkaline tsis daws teeb meem, vim hais tias mus ntev immersion nyob rau hauv xws li kev daws yuav ua rau cov pH iav zaj duab xis teb maj mam. Kev npaj kom raug ntawm pH electrode soaking tov: Siv ib pob ntawm pH 4.00 buffer (250ml) thiab yaj nyob rau hauv 250ml ntawm dej ntshiab. Tom qab ntawd ntxiv 56 grams ntawm kev tsom xam ntshiab KCl, cua sov kom tsim nyog, thiab do kom txog thaum yaj tag.
