Cov txheej txheem thiab cov kauj ruam rau Calibration ntawm pH Meter
1. Calibration ntawm pH meter|Acidity meter siv hauv chav kuaj:
Thaum ntsuas qhov ntsuas pH meter feem ntau siv hauv chav ntsuas, txoj kab nqes ntawm qhov ntsuas yuav tsum tau hloov mus rau qhov siab tshaj plaws, thiab cov roj hmab ntsaws rau sab saud ntawm cov electrode yuav tsum raug tshem tawm kom nthuav tawm lub qhov me me. Txwv tsis pub, lub siab tsis zoo yuav raug tsim thaum lub sij hawm calibration, thiab cov tshuaj yuav tsis ua hauj lwm ib txwm. 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 tshem tawm cov dej distilled seem ntawm cov electrode. Tom qab ntawd muab cov electrode tso rau hauv lub beaker nrog cov phosphoric acid sib xyaw, tos ntev dua 15 feeb, thiab tom qab ntawd kho cov pob qhov rooj ntawm lub ntsuas ntsuas kom ntsuas ntsuas 6.86pH, uas yog los teeb tsa cov ntaub ntawv siv. taw tes rau qhov ntsuas ua ntej. Tom qab teeb tsa qhov taw qhia, tshem tawm 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 yaj cov seem ntawm cov dej. tov phosphoric acid tov.
2. Tshem cov electrode tawm ntawm lub beaker uas muaj cov dej distilled tom qab, thiab siv cov ntawv lim kom qhuav cov dej distilled seem ntawm cov electrode. Tom qab ntawd muab cov electrode tso rau hauv cov tshuaj uas muaj poov tshuaj hydrogen phthalate los yog borax, tos ntev dua 15 feeb, thiab saib seb lub ntsuas ntsuas 4.00 lossis 9.18 pH. Yog tias tsis yog, kho cov pob qhov rooj ntawm qhov ntsuas kom ua rau lub ntsuas ntsuas 4.00 lossis 9.18 pH, uas yog qhov siv ob-point calibration. Yog hais tias yuav tsum tau calibration peb-point, tsuas yog siv lwm txoj kev daws teeb meem thiab ua raws li cov kauj ruam saum toj no los ua nws ib zaug ntxiv. Qhov no yog txoj kev calibration ntawm pH meter.
3. Tom qab calibration, muab cov roj hmab ntsaws rov qab. Yog tias koj tsis siv nws ib ntus, nco ntsoov muab cov tshuaj saturated rau hauv lub tes tsho tiv thaiv ntawm cov electrode kom cov electrode ntub dej, uas tuaj yeem ua rau lub neej ntev ntawm cov electrode thiab txo cov peev xwm asymmetrical 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 xav tias cov electrodes yuav tsis raug hloov yog tias lawv tsis puas thaum siv.
4. Ua ntej siv cov khoom siv hluav taws xob sib xyaw, 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, thaum qhov chaw thiab txoj kab nqes pob tuaj yeem hloov kho raws li tus nqi pH, feem ntau suav tias yog txais, txwv tsis pub kev kho electrode activation tuaj yeem ua raws li phau ntawv qhia. Txoj kev ua kom dej yog tsau rau hauv 4 feem pua ntawm cov tshuaj hydrogen fluoride li ntawm 3-5 s, tshem tawm thiab yaug nrog dej distilled; ces muab tso rau hauv 0.1 mol/L basin acid tov rau ob peb teev, yaug nws nrog dej distilled, thiab ces calibrate nws. Rau cov electrodes uas tsis yog kaw, yog tias cov tshuaj sab hauv tsawg dua 1/3, nws yog ib qho tsim nyog yuav tsum tau ntxiv cov tshuaj siv sab nraud, uas yog, 3mol / L potassium fluoride tov. Yog tias cov tshuaj potassium fluoride tshaj qhov chaw ntawm lub qhov me me, co tawm cov tshuaj potassium fluoride ntau dhau thiab xyuas seb puas muaj npuas hauv cov tshuaj. Yog tias muaj npuas, flick lub electrode los tsav cov npuas tawm tag, thiaj li tsis ua rau cov ntaub ntawv ntsuas tsis raug.
5. Calibration method of mem pH meter:
Raus lub electrode ntawm lub xeem cwj mem nyob rau hauv lub mix phosphate standard buffer tov nrog ib tug pH nqi ntawm 6.86 (ntawm 25 degree ), thiab co nws maj mam; kho lub calibration potentiometer nrog ib tug me me screwdriver kom txog rau thaum lub tso saib tus nqi sib tw pH tus nqi ntawm tus qauv buffer tov ntawm ambient kub; Ntxig cov electrode rau hauv pH4.01 potassium hydrogen phthalate lossis pH9.18 borax standard buffer tov; 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.
