Cov kauj ruam thiab cov txheej txheem ntawm calibrating pH meter
1. Calibration ntawm pH meter thiab pH meter siv hauv chav kuaj:
Thaum calibrating cov cuab yeej siv pH meter feem ntau siv, 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 qhib kom nthuav tawm lub qhov me me. Txwv tsis pub, lub siab tsis zoo yuav raug tsim tawm thaum lub sij hawm calibration, uas yuav ua rau cov kev daws teeb meem tsis tuaj yeem pauv ions ib txwm thiab ua rau cov ntaub ntawv ntsuas tsis raug.
Tshem cov electrode tawm ntawm lub beaker uas muaj dej distilled, thiab nqus cov dej distilled seem ntawm cov electrode nrog cov ntawv lim. Tom qab ntawd muab cov electrode tso rau hauv lub beaker nrog cov phosphoric acid sib xyaw, tos ntev dua 15 min, thiab tom qab ntawd kho cov pob qhov rooj ntawm lub ntsuas ntsuas kom ua rau lub 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 cov electrode tawm ntawm lub beaker uas muaj cov tshuaj phosphoric acid tov, ntxuav cov electrode nrog dej distilled, muab tso rau hauv lub beaker uas muaj dej distilled, thiab tos li 3 min kom yaj cov seem ntawm cov phosphoric acid tov. daws.
2. Tom qab ntawd, tshem cov electrode tawm ntawm lub beaker uas muaj dej distilled, thiab nqus cov dej distilled seem ntawm cov electrode nrog cov ntawv lim. 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 ntawm 4 yog dab tsi.00 lossis 9.18. Yog tias tsis yog, kho lub pob qhov rooj ntawm qhov ntsuas kom ua rau lub ntsuas ntsuas 4. Yog xav tau kev kho peb-taw tes, tsuas yog rov ua haujlwm ntawm lwm txoj kev daws teeb meem raws li cov kauj ruam saum toj no. Qhov no yog txoj kev calibration ntawm acidity meter.
3. Tom qab calibration, ntsaws cov roj hmab ntsaws rov qab. Yog tias nws tsis siv ib ntus, nco ntsoov muab cov tshuaj saturated rau hauv lub tes tsho tiv thaiv ntawm cov electrode kom cov electrode moist, uas tuaj yeem ua rau lub neej ntev ntawm cov electrode thiab txo cov peev xwm asymmetric ntawm cov electrode. Electrodes muaj lub neej ua haujlwm thiab tsis yooj yim. Yog li ntawd, txhua lub chaw kuaj mob yuav tsum tau hloov cov electrodes nquag. Tsis txhob xav tias electrodes yuav tsis raug hloov yog tias 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 ob lub ntsiab lus calibration yog nqa tawm nrog cov tshuaj pH tsis, qhov chaw thiab txoj kab nqes pob tuaj yeem hloov kho rau tus nqi pH, uas feem ntau suav tias yog siv tau. Txwv tsis pub, lub electrode tuaj yeem qhib tau raws li phau ntawv qhia. Txoj kev ua kom dej yog tsau hauv 4 feem pua ntawm cov tshuaj hydrogen fluoride rau li 3 ~ 5 s, tshem tawm thiab yaug nrog dej distilled; Tom qab ntawd tsau rau hauv 0.1 mol/L lauj kaub kua qaub rau ob peb teev, yaug nrog dej distilled, thiab ces calibrate. Rau cov khoom siv hluav taws xob tsis kaw, yog tias cov tshuaj sab hauv tsawg dua 1/3, cov tshuaj siv sab nraud, uas yog 3mol / L potassium fluoride tov, yuav tsum tau ntxiv. Yog tias cov tshuaj potassium fluoride tshaj qhov chaw ntawm lub qhov me me, muab pov tseg cov tshuaj potassium fluoride ntau dhau thiab xyuas seb puas muaj npuas hauv cov tshuaj. Yog tias muaj npuas, flick lub electrode kom tsav lawv tawm tag nrho, kom tsis txhob muaj cov ntaub ntawv ntsuas tsis raug.
5, cwj mem pH meter calibration method:
Raus lub electrode ntawm lub xeem cwj mem nyob rau hauv lub mix phosphate standard buffer nrog pH nqi ntawm 6.86 (ntawm 25 degree) thiab maj mam co nws; Kho lub calibration potentiometer nrog ib tug me me screwdriver kom txog rau thaum tus nqi tso tawm raws li tus nqi pH ntawm tus qauv buffer tov ntawm ambient kub; Cov electrode yog muab tso rau hauv cov txheej txheem tsis daws teeb meem ntawm poov tshuaj hydrogen phosphate nrog pH4.01 lossis borax nrog PH9.18; Tus nqi tso tawm yuav tsum nyob rau hauv qhov kev tso cai yuam kev piv nrog PH tus nqi ntawm cov tshuaj tsis haum.
