Peb txoj kev ntawm pH meter calibration
1. Ib-point calibration ntawm pH meter
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, lub ntsuas ntsuas tuaj yeem hloov kho nrog ib txoj hauv kev raug. Feem ntau, pH6.86 lossis pH7. 00 standard buffer. Qee cov twj paj nruag muaj qhov tseeb ntawm tsuas yog 0.2pH lossis 0.lpH, yog li lub ntsuas tsuas muaj ¨positioning¨ hloov kho pob qhov rooj. 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, tshawb xyuas lub rooj los txiav txim siab pHs tus nqi ntawm qhov kub thiab txias, thiab kho qhov kub ntawm qhov kub thiab txias.
(2) Yaug cov electrode nrog dej ntshiab thiab qhuav nws.
(3) Muab cov hluav taws xob tso rau hauv cov tshuaj tsis muaj zog thiab co nws thiab muab tso rau. Tom qab kev nyeem ntawv ruaj khov, kho lub qhov rooj qhov rooj kom lub ntsuas ntsuas pH tus nqi ntawm cov qauv kev daws teeb meem.
(4) Tshem tawm cov electrode, yaug thiab qhuav.
tus
(5) Ntsuas tus qauv ntsuas kub thiab kho qhov kub thiab txias ntawm qhov ntsuas pH rau qhov ntsuas kub
2. Ob-point calibration ntawm pH meter
Rau precision qib pH meters, ntxiv rau ¨positioning¨ thiab ¨temperature them nyiaj hloov kho, kuj tseem muaj kev hloov kho electrode ¨slope¨, uas yuav tsum tau muaj ob txoj kev daws teeb meem tsis zoo rau calibration. Feem ntau, pH6.86 lossis pH7. los yog pH9.18 thiab pHI0. Cov kauj ruam ua haujlwm tshwj xeeb yog:
(1) Ntxuav thiab qhuav cov electrode, raus rau hauv pH6.86 los yog pH7.00 txheem tov, thiab muab qhov kub thiab txias qhov ntsuas qhov ntsuas ntawm qhov kub ntawm cov tshuaj. Tom qab tus nqi tso tawm yog qhov ruaj khov, kho qhov chaw qhov rooj kom lub ntsuas ntsuas pHs tus nqi ntawm cov txheej txheem daws teeb meem.
(2) Tshem tawm cov electrode, ntxuav thiab qhuav nws, thiab muab tso rau hauv cov txheej txheem thib ob. Tom qab tus nqi tso tawm yog qhov ruaj khov, kho qhov pob qhov rooj ntawm qhov ntsuas kom pom tus nqi ntawm qhov ntsuas yog pHs tus nqi ntawm cov txheej txheem thib ob.
(3) Tshem tawm cov electrode, ntxuav nws thiab qhuav nws, thiab tom qab ntawd muab tso rau hauv pH6.86 lossis pH7.00 buffer solution. Yog tias qhov ua yuam kev dhau 0.02pH, rov ua cov kauj ruam (1) thiab (2) kom txog thaum pH raug tso tawm tuaj yeem pom hauv ob txoj kev daws teeb meem yam tsis tau kho cov pob qhov rooj.
(4) Tshem tawm cov electrode thiab co kom qhuav, kho pH kub them pob qhov rooj rau qhov ntsuas kub ntawm cov qauv tshuaj, raus cov electrode hauv cov qauv tshuaj, co nws thiab tso nws, thiab tso saib kev nyeem ntawv ruaj khov.
3. Qhov thib peb point calibration ntawm pH meter
Txawm li cas los xij ntawm pH meter, qhov taw tes ntawm pH {{0}} yuav tsum tau ntsuas, thiab qhov taw tes ntawm pH=7 yuav tsum tau ntsuas ua ntej thaum lub sij hawm calibration ob. Thaum ua calibration, pib los ntawm 7.0, thiab cov txheej txheem xaiv cov tshuaj muaj feem xyuam rau pH tus nqi ntawm cov tshuaj yuav tsum tau ntsuas, kom pH tus nqi ntawm cov tshuaj yuav poob nyob rau hauv lub calibrated pH ntau yam. 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, lub ntsiab lus thib peb yuav tsum xav txog. Qee cov twj paj nruag tuaj yeem ntsuas peb lub ntsiab lus, thiab muaj ib qho kev xaiv hom, uas tuaj yeem siv ncaj qha. Rau qee qhov uas tsis yog, ob-point ob-point proofreading feem ntau yog siv, uas yog, proofreading ob zaug.
Rau qhov calibration ua tiav nrog 7.004.01, yog qhov thib peb xav tau, kuv puas yuav tsum siv 9.21 tsis yog 10.01, 9.18, 12.46, 1.68 thiab lwm yam buffers? Yuav txiav txim li cas?
1. Qhov tseeb, kev kho pH ntawm qhov thib peb feem ntau yog nyob ntawm koj tus qauv coj mus kuaj. Raws li koj tau hais, muaj ntau ntau yam kev daws teeb meem xws li pH 1.68 txog 12.46, thiab cov kev daws teeb meem tsim nyog yuav tsum raug xaiv raws li qhov kawg pH ntau yam ntawm cov qauv. Peb feem ntau siv 4.00, 6.86, 9.18. Yog tias koj tus qauv yog alkaline ntau, koj xav tau 9.18, 10.01, 12.46. Qhov kev txiav txim ntawm calibration sib txawv nrog cov cuab yeej sib txawv. Qee qhov xav tau calibration hauv kev txiav txim, thaum lwm tus tsis ua. Lub ntsuas yuav cia li paub nws. Thov xa mus rau phau ntawv qhia txog cov cuab yeej siv.
2. Txawm li cas los xij ntawm pH meter, qhov taw tes ntawm pH =7 yuav tsum tau calibrated, thiab qhov taw tes ntawm pH =7 yuav tsum tau calibrated ua ntej thaum lub sij hawm calibration ob-point. Thaum ua calibration, pib los ntawm 7.0, thiab cov txheej txheem xaiv kev daws teeb meem muaj feem xyuam rau cov pH tus nqi ntawm cov tshuaj yuav tsum tau ntsuas, kom pH tus nqi ntawm cov tshuaj yuav poob nyob rau hauv lub calibrated pH ntau yam. 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, lub ntsiab lus thib peb yuav tsum xav txog. Qee cov twj paj nruag tuaj yeem ntsuas peb lub ntsiab lus, thiab muaj ib qho kev xaiv hom, uas tuaj yeem siv ncaj qha. Rau qee qhov uas tsis yog, ob-point ob-point proofreading feem ntau yog siv, uas yog, proofreading ob zaug.
3. Peb feem ntau siv calibration sequence ntawm 7, 4, 10. xyuas cov kua qaub ua ntej thiab tom qab ntawd lub hauv paus.
