Vim li cas thiaj yuav tsum tau dej pH electrode? Yuav ua li cas ntub cov pH composite electrode kom raug?
Lub pH electrode yuav tsum tau soaked ua ntej siv, vim hais tias lub pH noob yog ib tug tshwj xeeb iav daim nyias nyias, thiab muaj ib tug nyias gel txheej nyob rau saum npoo ntawm lub iav membrane. Kev npam. Nyob rau tib lub sijhawm, cov iav electrode yog tsau, uas tuaj yeem txo qhov peev xwm asymmetric thiab zoo li ruaj khov. Lub pH iav electrode feem ntau tuaj yeem tsau rau hauv dej distilled lossis tsis tov nrog pH =4. Feem ntau nws yog qhov zoo dua rau soak hauv pH =4 tsis muaj tshuaj, thiab lub sij hawm soaking yog 24 teev los yog ntev dua, nyob ntawm seb lub thickness ntawm lub teeb iav daim nyias nyias thiab cov aging degree ntawm electrode. Nyob rau tib lub sijhawm, cov kua sib txuas ntawm cov khoom siv electrode kuj yuav tsum tau ntub dej. Vim hais tias, yog hais tias cov kua hlws ris dries, lub peev xwm ntawm cov kua hlws ris yuav nce los yog ua tsis ruaj tsis khov, immersion tov ntawm cov reference electrode yuav tsum tau raws li cov kev siv sab nraud ntawm cov reference electrode, uas yog, 3.3mol / L KCl tov. los yog saturated KCl tov, Lub sij hawm soaking feem ntau yog ob peb teev.
Yog li ntawd, rau pH composite electrode, nws yuav tsum tau soaked nyob rau hauv lub pH =4 buffer tov uas muaj KCl, thiaj li hais tias nws muaj peev xwm ua rau lub iav qhov muag teev thiab cov kua hlws ris tib lub sij hawm. Kev saib xyuas tshwj xeeb yuav tsum tau them rau ntawm no, vim tias yav dhau los, tib neeg tau siv ib qho pH iav electrode kom ntub dej hauv deionized los yog pH =4 pab pawg dej yaug. Tom qab ntawd, thaum siv cov pH sib xyaw electrode, txoj kev ntub dej no tseem siv tau, txawm tias qee qhov tsis raug. Qhov kev taw qhia yuam kev no tseem yuav tau ua nyob rau hauv phau ntawv qhia ntawm pH ua ke electrode. Qhov txiaj ntsig ncaj qha ntawm txoj kev immersion tsis ncaj ncees yog tias pH cov khoom siv hluav taws xob nrog kev ua haujlwm zoo dhau los ua cov electrode nrog cov lus teb qeeb thiab tsis zoo, thiab lub sijhawm immersion ntev dua, qhov ua tau zoo dua, vim tias tom qab lub sijhawm ntev immersion, cov kua hlws ris. KCl concentration sab hauv (piv txwv li, hauv cov xuab zeb core) tau txo qis heev, nce thiab ua kom tsis muaj zog ntawm cov kua dej sib txuas. Tau kawg, cov electrodes yuav rov qab los nrog ob peb teev ntawm rov qab so hauv cov kua dej kom raug.
Tsis tas li ntawd, pH electrode yuav tsum tsis txhob muab tso rau hauv nruab nrab lossis alkaline tsis daws teeb meem. Kev nkag mus rau lub sijhawm ntev hauv cov tshuaj zoo li no yuav ua rau pH iav membrane qeeb hauv cov lus teb.
Kev npaj cov pH electrode soaking kom raug: Siv ib pob pH =4 00 buffer (250mL), yaj nyob rau hauv 250mL dej ntshiab, ntxiv 56 grams ntawm analytically ntshiab KCl, cua sov kom zoo, thiab do. kom txog thaum yaj tag.
