Ib tug taw tes calibration thiab ob point calibration ntawm pH meters
Txhua lub pH ntsuas yuav tsum tau ntsuas nrog pH tus qauv daws ua ntej ntsuas pH tus nqi ntawm tus qauv. Rau cov qauv nrog kev ntsuas qhov tseeb hauv qab no {{0}}.1 pH, ib qho kev ntsuas qhov taw qhia tuaj yeem siv los kho qhov ntsuas, feem ntau yog siv pH 4.01 lossis pH 7.{{5} } standard buffer solution. Qee cov cuab yeej muaj qhov tseeb ntawm 0.2pH lossis 0.1pH, yog li lawv tsuas muaj qhov hloov kho qhov chaw. Cov kauj ruam ua haujlwm tshwj xeeb yog raws li hauv qab no:
(1) Ntsuas qhov ntsuas kub ntawm cov txheej txheem kev daws teeb meem, kos lub rooj los txiav txim siab tus nqi pH ntawm qhov kub thiab txias, thiab kho qhov kub ntawm qhov kub thiab txias.
(2) Yaug cov electrodes nrog dej ntshiab thiab co kom qhuav.
(3) Muab cov electrode tso rau hauv cov tshuaj tsis haum thiab co nws ua ntej sawv ntsug. Tom qab 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, yaug thiab co kom qhuav.
(5) Ntsuas tus qauv ntsuas kub thiab kho cov pH ntsuas kub ntsuas qhov ntsuas kub rau qhov ntsuas kub no.
(6) Muab cov electrode tso rau hauv cov qauv kev daws teeb meem, co nws thiab cia nws sawv ntsug, thiab tso saib kev nyeem ntawv ruaj khov.
Dab tsi yog ob-point calibration ntawm pH meters?
Rau precision pH meters, nyob rau hauv tas li ntawd mus rau "txoj hauj lwm" thiab "kub them" kho, kuj muaj electrode "slope" hloov, uas yuav tsum tau calibration nrog ob tug txheej txheem tsis daws teeb meem. Feem ntau, pH 4.01 los yog pH 7.00 yog siv rau "txoj hauj lwm" calibration ua ntej, thiab ces pH 4.01 (acidic) los yog pH 9.21 thiab pH 0.01 (alkaline) buffer solutions raug xaiv rau "txoj kab nqes" calibration raws li acidity thiab alkalinity ntawm cov tshuaj ntsuam xyuas. Cov kauj ruam ua haujlwm tshwj xeeb yog:
(1) Ntxuav cov electrode thiab co kom qhuav, muab tso rau hauv ib qho kev daws teeb meem ntawm pH 4.01 lossis pH 7. Tom qab tus nqi qhia tau ruaj khov, kho lub qhov rooj qhov rooj kom tus nqi ntawm qhov ntsuas ntsuas pH tus nqi ntawm cov qauv kev daws teeb meem.
(2) Tshem tawm cov electrode, ntxuav thiab co kom qhuav, thiab muab tso rau hauv thawj txheej txheem tov. Tom qab tus nqi qhia tau ruaj khov, kho txoj kab nqes pob qhov ntsuas ntawm qhov ntsuas kom tus nqi qhia ntawm qhov ntsuas yog pH tus nqi ntawm cov txheej txheem thib ob.
(3) Tshem tawm cov electrode, ntxuav nws thiab co kom qhuav, ces muab tso rau hauv pH 4.01 lossis pH 7.00 tsis muaj tshuaj. Yog tias qhov ua yuam kev dhau 0.02pH, rov ua cov kauj ruam (1) thiab (2) kom txog thaum tus nqi pH raug tso tawm kom pom hauv ob qho kev daws teeb meem yam tsis tau kho cov pob qhov rooj.
(4) Tshem tawm cov electrode thiab co kom qhuav. Kho qhov pH kub them pob qhov rooj rau qhov kub ntawm cov qauv tov. Tso cov electrode rau hauv cov qauv kev daws teeb meem, co nws, thiab cia nws sawv ntsug kom txog thaum nws pom qhov kev nyeem ntawv ruaj khov.
