Vim li cas cov pH electrode yuav tsum tau soaked, thiab yuav ua li cas rau soak lub pH composite electrode kom raug?
Lub pH meter yog ib qho cuab yeej me me hauv peb chav kuaj, thiab nws kuj yog lub hauv paus ntawm ntau yam kev sim. Peb tsis tsuas yog yuav tsum ntsuas pH ntawm tus qauv tab sis kuj yog pH ntawm lub xov tooj ntawm tes, yog li peb yuav tsum tsis txhob kwv yees nws. Lub cev me me muaj txiaj ntsig zoo, thiab peb xav khaws nws Zoo, nws yuav ua li cas? saib. . .
Lub pH electrode yuav tsum tau soaked ua ntej siv, vim hais tias pH noob yog ib tug tshwj xeeb iav daim nyias nyias, thiab muaj ib tug nyias hydrated gel txheej nyob rau saum npoo ntawm lub iav daim nyias nyias, uas yuav muaj ib tug zoo kev sib raug zoo nrog cov hydrogen ions nyob rau hauv cov tshuaj xwb. nyob rau hauv tag nrho ntub tej yam kev mob teb. Nyob rau tib lub sijhawm, cov iav electrode tuaj yeem txo qhov peev xwm asymmetric thiab zoo li ruaj khov tom qab soaking. Lub pH iav electrode feem ntau tuaj yeem tsau rau hauv dej distilled lossis pH4 tsis muaj tshuaj. Feem ntau nws yog qhov zoo dua los siv cov tshuaj pH4 tsis zoo, thiab lub sij hawm ntub dej yog 8 teev mus rau 24 teev lossis ntev dua, nyob ntawm qhov tuab ntawm lub teeb iav daim nyias nyias thiab kev laus ntawm cov 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 cov kua hlws ris nto dries, cov kua hlws ris muaj peev xwm yuav nce los yog tsis ruaj khov. Cov tshuaj immersion ntawm cov ntaub ntawv 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. Feem ntau ob peb teev.
Yog li ntawd, rau pH composite electrode, nws yuav tsum tau soaked nyob rau hauv PH4 tsis tov tshuaj 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 los soak hauv dej deionized lossis pH4 tsis muaj tshuaj, thiab tom qab ntawd siv txoj kev ntub dej no thaum siv pH electrode. Qhov txiaj ntsig ncaj qha ntawm txoj kev immersion tsis raug no yog tig lub pH sib xyaw electrode nrog kev ua haujlwm zoo rau hauv cov khoom siv hluav taws xob nrog cov lus teb qeeb thiab tsis zoo, thiab lub sijhawm immersion ntev dua, qhov kev ua tau zoo dua, vim tias tom qab lub sijhawm ntev immersion, cov kua dej sib txuas. Qhov concentration ntawm KCL nyob rau hauv ciam teb (xws li hauv cov xuab zeb core) tau txo qis heev, ua rau lub peev xwm ntawm cov kua hlws ris nce thiab tsis ruaj khov. 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 tso dej mus ntev hauv cov tshuaj zoo li no yuav ua rau pH iav membrane tsis teb. Kev npaj cov pH electrode soaking kom raug: Siv ib pob ntawm pH4.00 buffer (250ml), yaj nyob rau hauv 250ml dej ntshiab, ces ntxiv 56g ntawm analytically ntshiab KCL, cua sov kom zoo, thiab do kom txog thaum yaj tag. Txhawm rau ua kom cov pH sib xyaw electrode siv tau yooj yim dua, qee qhov pH sib xyaw electrodes txawv teb chaws thiab qee cov khoom siv hluav taws xob hauv tsev tau nruab nrog lub hnab yas kaw ntawm lub taub hau ntawm pH sib xyaw electrode, uas muaj cov tshuaj electrode soaking. Tsuas yog ntxuav nws tawm, yooj yim heev. Txoj kev khaws cia no tsis yog yooj yim xwb tab sis kuj tseem muaj txiaj ntsig zoo rau kev ua kom lub neej ntev ntawm cov electrode, tsuas yog them sai sai rau cov kua dej hauv cov yas vial kom tsis txhob muaj kuab paug, thiab xyuam xim rau kev hloov.
