Cov kauj ruam thiab cov txheej txheem rau calibrating ib pH meter
1. pH ntsuas siv hauv chav kuaj|Acidity meter calibration:
Thaum calibrating ib tug nquag siv pH meter, txoj kab nqes ntawm lub ntsuas yuav tsum tau hloov mus rau qhov siab tshaj plaws, thiab cov roj hmab ntsaws rau sab sauv ntawm lub electrode yuav tsum raug tshem tawm kom nthuav tawm lub qhov me me. Txwv tsis pub, lub siab tsis zoo yuav raug tsim tawm thaum lub sij hawm calibration, ua rau cov kev daws teeb meem tsis zoo li qub. Kev sib pauv ion yuav ua rau cov ntaub ntawv ntsuas tsis raug.
Tshem cov electrode tawm ntawm lub beaker uas muaj cov dej distilled thiab siv cov ntawv lim kom nqus cov dej distilled seem ntawm cov electrode. Tom qab ntawd muab cov electrode tso rau hauv lub beaker nrog cov sib xyaw phosphoric acid phiab, tos ntev dua 15 feeb, thiab tom qab ntawd kho cov pob qhov rooj ntawm qhov ntsuas kom lub ntsuas ntsuas 6.86pH. Qhov no yog thawj zaug teeb tsa qhov taw qhia siv rau qhov ntsuas. Tom qab teeb tsa qhov taw qhia, tshem cov electrode tawm ntawm lub beaker uas muaj cov tshuaj phosphoric acid tov, ntxuav cov electrode nrog dej distilled, thiab muab tso rau hauv lub beaker uas muaj dej distilled. Tos li 3 feeb kom cia cov seem ntawm cov tshuaj phosphoric acid tov kom yaj.
2. Tom qab ntawd, tshem tawm cov electrode ntawm lub beaker uas muaj cov dej distilled, thiab siv cov ntawv lim kom nqus cov dej distilled seem ntawm cov electrode. Tom qab ntawd muab cov hluav taws xob tso rau hauv cov tshuaj uas muaj cov poov tshuaj hydrogen phthalate lossis borax, tos ntev dua 15 feeb, thiab saib seb lub ntsuas pH 4 puas pom los yog 00 lossis 9.18. Yog tias tsis yog, kho lub pob qhov rooj ntawm qhov ntsuas kom lub ntsuas ntsuas 4.00 lossis 9.18 pH. Qhov no yog ib qho kev siv ob-point calibration. Yog hais tias peb-point calibration yog yuav tsum tau, cia li ntxiv lwm txoj kev thiab ua raws li cov kauj ruam saum toj no ib zaug ntxiv. Qhov no yog yuav ua li cas calibrate ib acidometer.
3. Tom qab calibration, muab cov roj hmab ntsaws rov qab rau hauv, yog tias nws tsis siv ib ntus, nco ntsoov muab cov tshuaj saturated rau hauv lub tes tsho tiv thaiv ntawm electrode kom cov electrode moist. Qhov no tuaj yeem txuas lub neej ntawm electrode thiab txo cov peev xwm asymmetric ntawm cov electrode. Electrodes muaj lub neej ua haujlwm thiab tsis yooj yim. Yog li ntawd, txhua chav kuaj yuav tsum tau hloov cov electrodes nquag. Tsis txhob hloov cov electrodes vim lawv tsis tawg thaum siv.
4. Ua ntej siv cov khoom siv electrode, ua ntej xyuas seb lub iav qhov muag puas tawg lossis tawg. Yog tias tsis yog, thaum siv cov tshuaj pH tsis haum rau ob lub ntsiab lus calibration, thiab qhov chaw thiab txoj kab nqes pob tuaj yeem hloov kho rau tus nqi pH sib raug, nws feem ntau suav tias muaj kev nyab xeeb siv. Txwv tsis pub, Electrode activation tuaj yeem ua tau raws li phau ntawv qhia. Txoj kev ua kom dej yog tsau rau hauv 4% hydrogen fluoride tov rau li 3 mus rau 5 vib nas this, tshem tawm thiab yaug nrog dej distilled; ces muab tso rau hauv 0.1 mol/L basin acid tov rau ob peb teev, yaug nrog dej distilled, thiab ces calibrate. Rau cov uas tsis yog-sealed composite electrodes, yog hais tias lub puab tov yog<1/3, an external reference solution, namely 3mol/L potassium fluoride solution, needs to be added. If the potassium fluoride solution exceeds the position of the small hole, shake off the excess potassium fluoride solution and check whether there are bubbles in the solution. If there are bubbles, flick the electrode to drive them out completely to avoid inaccurate measurement data.
5. Calibration method of mem pH meter:
Dip lub ntsuas cwj mem electrode rau hauv cov tshuaj phosphate standard buffer tov nrog tus nqi pH ntawm 6.86 (ntawm 25 degree) thiab co nws maj mam; siv lub taub hau me me los kho cov calibration potentiometer kom txog thaum tus nqi tso tawm sib tw pH tus nqi ntawm cov txheej txheem tsis haum ntawm qhov kub thiab txias. ; Cov electrode yog muab tso rau hauv poov tshuaj hydrogen phosphobenthate nrog pH 4.01 los yog borax standard buffer tov nrog pH 9.18; tus nqi tso tawm yuav tsum nyob rau hauv qhov kev tso cai yuam kev piv nrog tus nqi pH ntawm cov tshuaj tsis haum.
