Taw qhia rau calibration thiab siv pH meter
1. Siv
Tig lub hwj chim hloov thiab preheat lub ntsuas rau 15 feeb
(1) Siv lub ntsuas kub ntsuas kub los ntsuas qhov ntsuas kub ntawm cov tshuaj
(2) Kho qhov kub thiab txias ntawm lub ntsuas vaj huam sib luag kom lub ntsuas kab ntawm lub pob qhov rooj yog raws li qhov ntsuas kub ntawm cov tshuaj yuav tsum ntsuas.
(3) Muab cov electrode tso rau hauv cov tshuaj yuav tsum tau ntsuas, co me ntsis kom txog rau thaum lub digital zaub stabilizes thiab nyeem pH tus nqi. Ua kom tiav qhov ntsuas thiab sau nws.
Kev ceev faj ua ntej siv:
(1) Thaum siv thawj zaug, txij li cov electrode sojntsuam yog qhov qhuav, uas yuav cuam tshuam rau qhov ntsuas qhov tseeb ntawm lub ntsuas, thawj zaug nqus cov electrode hauv 3mol / L potassium chloride tov rau 2 teev.
(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. Ua kom tiav cov reagent kom tau 3mol / L potassium chloride tov.
(3) Hloov cov electrode ib xyoos ib zaug (cov electrode yuav tsum tau hloov tsis hais seb nws puas siv tau).
2. Calibration
Peb feem ntau calibrate pH meters, siv "ob-point calibration method", uas yog, xaiv ob tus qauv buffer tov, pH=6.86 thiab pH=4.00 los yog pH=9.18.
Rau precision-qib pH meters, ntxiv rau "kev tso chaw" thiab "kub them nyiaj" kev hloov kho, kuj tseem muaj kev hloov kho electrode "slope". Ua ntej siv pH=6.86 rau "qhov chaw" calibration, thiab tom qab ntawd xaiv pH=4.00 (acidic) lossis pH=9.18 (alkaline) buffer tov rau "txoj kab nqes" calibration raws li acid-base mob ntawm cov tshuaj ntsuam xyuas.
