Dab tsi yuav tsum tau them sai sai rau thaum ntsuas pH meter sensor?
Ua ntej ua haujlwm, xyuas qhov tseeb ntawm cov electrode ua ntej. Tam sim no, feem ntau ntawm cov electrodes siv nyob rau hauv pH meters yog composite electrodes, thaum lub qub tiam ntawm pH meters tseem siv iav electrodes thiab calomel electrodes. Vim tias cov khoom siv hluav taws xob sib xyaw tau siv dav, cov khoom siv hluav taws xob feem ntau tau tham hauv qab no.
Tam sim no, feem ntau yog ob hom kev sib xyaw electrodes siv nyob rau hauv lub chaw kuaj: tag nrho nyob rau hauv thiab tsis-cuam tshuam, thiab tag nrho cov nyob rau hauv ib tug kuj tsawg, feem ntau yog tsim los ntawm txawv teb chaws lag luam. Ua ntej siv cov khoom siv hluav taws xob sib xyaw, ua ntej xyuas seb lub iav qhov muag puas tawg lossis tawg. Yog hais tias tsis yog, nws yog feem ntau txiav txim siab tias nws tuaj yeem siv tau thaum qhov chaw thiab txoj kab nqes cov nyees khawm tuaj yeem hloov kho rau tus nqi pH thaum ob-point calibration yog nqa tawm nrog pH tsis haum tshuaj, txwv tsis pub, lub electrode tuaj yeem qhib tau raws li kev qhia. phau ntawv. Txoj kev ua kom dej yog tsau rau hauv 4 feem pua ntawm cov tshuaj hydrogen fluoride rau li 3 ~ 5 s, tshem tawm thiab yaug nws nrog dej distilled, ces tsau rau hauv 0.1mol / L hydrochloric acid tov rau ob peb teev, ces yaug nws nrog dej distilled, thiab tom qab ntawd calibrate nws, uas yog, nrhiav nws nrog ib tug buffer tov nrog ib tug pH ntawm 6.86(25 degree ). Tom qab hloov kho, arbitrarily xaiv lwm pH tsis daws teeb meem los kho txoj kab nqes. Yog tias nws tsis tuaj yeem hloov kho, lub electrode yuav tsum tau hloov. Rau lub unsealed composite electrode, ib qho kev siv sab nraud, uas yog 3 mol / L poov tshuaj chloride tov, yuav tsum tau ntxiv, yog li nws yog tsim nyog los xyuas seb cov poov tshuaj chloride tov nyob rau hauv lub electrode yog ntau tshaj 1/3, thiab yog hais tias tsis, 3. mol / L poov tshuaj chloride tov yuav tsum tau ntxiv. Yog tias cov tshuaj poov tshuaj chloride tshaj qhov chaw ntawm lub qhov me me, co tawm cov tshuaj poov tshuaj chloride ntau dhau los ua cov tshuaj hauv qab lub qhov me me, thiab xyuas seb puas muaj npuas hauv cov tshuaj. Yog tias muaj npuas, flick lub electrode kom tsav lawv tawm tag nrho.
