Dab tsi yuav tsum tau them sai sai rau thaum ntsuas nrog acidity meter sensor
Ua ntej ua haujlwm, kev ncaj ncees ntawm cov electrodes yuav tsum tau kuaj ua ntej. Tam sim no, feem ntau ntawm cov electrodes siv nyob rau hauv pH meters yog composite electrodes, thaum cov laus tiam ntawm pH meters tseem siv iav electrodes thiab calomel electrodes. Raws li kev siv dav dav ntawm cov khoom siv hluav taws xob, cov hauv qab no feem ntau tham txog cov khoom siv hluav taws xob sib xyaw.
Tam sim no, feem ntau yog ob hom kev sib xyaw electrodes siv nyob rau hauv lub chaw soj nstuam: tag nrho kaw thiab tsis kaw. Cov khoom siv hluav taws xob uas muaj nyob hauv yog qhov tsawg thiab feem ntau yog tsim los ntawm cov lag luam txawv teb chaws. Ua ntej siv cov khoom siv hluav taws xob sib xyaw, ua ntej xyuas seb puas muaj cov kab nrib pleb lossis tawg hauv lub iav qhov muag teev. Yog tias tsis yog, ua ob-point calibration nrog pH buffer tov. Thaum cov nyees khawm qhov chaw thiab txoj kab nqes tuaj yeem hloov kho rau tus nqi pH, feem ntau suav tias yog siv tau. Txwv tsis pub, ua raws li cov lus qhia rau kev kho electrode activation. Txoj kev ua kom dej yog tsau rau hauv 4% hydrogen fluoride tov li ntawm 3-5 vib nas this, ces muab nws tawm thiab yaug nrog dej distilled. Tom qab soaking nws nyob rau hauv ib tug 0.1mol/L hydrochloric acid tov rau ob peb teev, yaug nws nrog dej distilled, thiab ces calibrate nws. Ntawd yog, siv cov tshuaj tsis haum nrog tus nqi pH ntawm 6.86 (25 degree) rau qhov chaw. Tom qab hloov kho, xaiv lwm qhov pH tsis haum rau kev kho qhov nqes hav. Yog tias nws tsis tuaj yeem hloov kho, hloov cov electrode. Rau cov khoom siv hluav taws xob uas tsis muaj nyob rau hauv, ib qho kev siv sab nraud ntawm 3 mol / L potassium chloride tov yuav tsum tau ntxiv rau hauv. Yog li ntawd, nws yog ib qho tsim nyog los xyuas seb cov tshuaj potassium chloride hauv cov electrode puas siab dua 1/3. Yog tias tsis yog, 3 mol / L potassium chloride tov yuav tsum tau ntxiv. Yog tias cov tshuaj poov tshuaj chloride tshaj qhov chaw ntawm lub qhov me me, muab cov tshuaj potassium chloride ntau dhau thiab muab tso rau hauv qab lub qhov me me. Tshawb xyuas cov npuas hauv cov tshuaj, thiab yog tias muaj npuas, maj mam coj mus rhaub cov electrode kom tshem tawm tag nrho.
