Yuav ua li cas calibrate thiab siv pH meter
Tig lub hwj chim hloov thiab preheat lub ntsuas rau 15 feeb
(1) Ntsuas qhov ntsuas kub ntawm cov tshuaj yuav tsum tau kuaj nrog tus pas ntsuas kub
(2) Kho qhov kub thiab txias ntawm lub ntsuas vaj huam sib luag kom lub ntsuas kab ntawm lub pob qhov rooj sib haum nrog cov kev daws teeb meem
(3) Muab cov electrode tso rau hauv cov tshuaj yuav tsum tau kuaj, co me ntsis kom txog thaum cov duab digital stabilizes thiab nyeem nws tus nqi pH. Tom qab kev ntsuas tiav, ua ib daim ntawv teev tseg.
Kev ceev faj ua ntej siv:
(1) Thaum siv thawj zaug, vim qhov kev sojntsuam electrode qhuav, nws yuav cuam tshuam rau qhov ntsuas qhov tseeb ntawm qhov ntsuas. Yog li ntawd, soak lub electrode nyob rau hauv ib tug 3mol / L poov tshuaj chloride tov rau 2 teev ua ntej.
(2) Kev npaj ntawm 3mol / L poov tshuaj chloride tov: hnyav 223.65g ntawm poov tshuaj chloride thiab yaj nyob rau hauv ib liter ntawm distilled los yog deionized dej. Dissolve cov reagent kom tau 3mol/L potassium chloride tov.
(3) Hloov cov electrode ib xyoos ib zaug (tsis hais seb cov electrode puas ua haujlwm lossis tsis ua haujlwm).
calibration
Peb feem ntau calibrate pH meters siv "ob-point calibration method", uas yuav xaiv ob tus qauv buffer tov nrog pH=6.86 thiab pH=4.00 los yog pH =9.18.
Rau precision pH meters, ntxiv rau "qhov chaw" thiab "kub them nyiaj" kev hloov kho, kuj tseem muaj kev hloov kho electrode "slope". Ua ntej, ua "txoj hauj lwm" calibration nrog pH =6 86, thiab ces xaiv pH =4 00 (acidic) los yog pH =9.18 (alkaline ) buffer tov rau "txoj kab nqes" calibration raws li acidity thiab alkalinity ntawm cov tshuaj ntsuam xyuas.
