Cov txheej txheem luv luv rau calibrating ib ph meter
I. Ib-point calibration ntawm acidity meter
Txhua yam pH meter yuav tsum tau ntsuas los ntawm pH tus qauv kev daws teeb meem ua ntej ntsuas pH tus nqi ntawm tus qauv, rau qhov ntsuas qhov tseeb ntawm {{0}}.lpH qauv, koj tuaj yeem siv me ntsis ntawm polar calibration method los kho qhov ntsuas, feem ntau xaiv pH6.86 lossis pH7.00 tus qauv tsis haum. Qee cov twj paj nruag tsuas muaj 0.2pH lossis 0.lpH qhov tseeb, yog li lub ntsuas ntsuas tsuas yog nruab nrog ¨position¨ qhov hloov kho. Cov kauj ruam ua haujlwm tshwj xeeb yog raws li hauv qab no:
(1) Ntsuas qhov ntsuas kub ntawm tus qauv tsis zoo, xyuas lub rooj los txiav txim siab pHs tus nqi ntawm qhov kub thiab txias, thiab kho qhov kub thiab txias qhov rooj rau qhov kub ntawd.
(2) Yaug cov electrode nrog dej ntshiab thiab co kom qhuav.
(3) Muab cov electrode tso rau hauv cov tshuaj tsis haum thiab co nws, tom qab ntawd muab tso rau hauv qhov chaw ruaj khov. Thaum qhov kev nyeem ntawv ruaj khov, kho qhov chaw qhov rooj kom lub ntsuas ntsuas pH tus nqi ntawm cov qauv kev daws teeb meem.
(4) Tshem tawm cov electrode thiab yaug thiab co kom qhuav.
(5) Ntsuas qhov ntsuas kub ntawm cov qauv thiab kho qhov kub thiab txias ntawm qhov ntsuas pH rau qhov ntsuas kub.
Ob-point calibration ntawm pH meter
Rau precision qib pH meter, ntxiv rau ¨ positioning ¨ thiab ¨ kub them ¨ hloov kho, tab sis kuj muaj ib qho electrode ¨ txoj kab nqes ¨ hloov kho, nws yuav tsum tau calibrated nrog ob tus qauv tsis. Feem ntau yog thawj pH6.86 lossis pH7.00 rau ¨ positioning¨ calibration, thiab tom qab ntawd raws li acid-base xwm txheej ntawm cov tshuaj ntsuam xyuas, kev xaiv ntawm pH4.00 (acidic ) los yog pH9.18 thiab pHI0. Cov kauj ruam ua haujlwm tshwj xeeb yog:
(1) Cov electrode yog ntxuav thiab qhuav, muab tso rau hauv pH6.86 los yog pH7.00 txheem tov, thiab qhov ntsuas kub ntawm qhov ntsuas kub yog muab tso rau ntawm qhov ntsuas kub. Thaum cov zaub tus nqi ruaj khov, kho qhov chaw qhov rooj kom lub ntsuas ntsuas ntsuas tus nqi yog pHs tus nqi ntawm cov qauv kev daws teeb meem.
(2) Tshem tawm cov electrode, ntxuav thiab qhuav, muab tso rau hauv cov txheej txheem thib ob. Thaum tus nqi ruaj khov, kho qhov pob qhov rooj ntawm qhov ntsuas kom tus nqi ntawm qhov ntsuas yog pHs tus nqi ntawm cov txheej txheem thib ob.
(3) Tshem tawm cov electrode, ntxuav thiab qhuav nws, thiab ces muab tso rau hauv pH 6.86 los yog pH 7.00 buffer tov. Yog tias qhov yuam kev ntau dua 0.02 pH, rov ua cov kauj ruam (1) thiab (2) kom txog rau thaum pHs tus nqi raug tso tawm hauv ob qho kev daws teeb meem yam tsis tau kho cov pob qhov rooj.
(4) Tshem tawm cov electrode thiab co qhuav, kho pH kub them pob qhov rooj rau qhov ntsuas kub ntawm cov qauv tshuaj, raus cov electrode hauv cov qauv tshuaj, co thiab tom qab ntawd sawv ntsug, tso saib nyeem ntawv tom qab stabilization.
Peb, qhov thib peb point ntawm calibration ntawm pH meter
Txawm li cas los xij ntawm pH meter, pH {{0}} qhov taw tes no yuav tsum raug kho, thiab hauv ob lub ntsiab lus calibration yuav tsum tau kho thawj pH=7 cov ntsiab lus no. Ua qhov calibration los ntawm 7.0 mus pib, xaiv cov qauv kev daws teeb meem thiab txiav txim siab tus nqi pH ntawm cov tshuaj, kom cov pH tus nqi ntawm cov tshuaj yuav poob rau hauv calibration ntawm PH ntau. Feem ntau ob lub ntsiab lus tuaj yeem siv los ua kom tau raws li qhov yuav tsum tau ua, yog tias qhov kev xav tau siab heev, ua ntej txiav txim siab qhov thib peb. Qee cov cuab yeej tuaj yeem ntsuas peb lub ntsiab lus, muaj cov qauv xaiv, koj tuaj yeem siv hom ncaj qha. Qee qhov tsis muaj, feem ntau siv ob-point ob-point calibration, uas yog, calibration ob zaug.
