Dab tsi yog cov kev ceev faj rau pH meter calibration
Lub chaw soj nstuam xav tau lub sijhawm ntsuas ntsuas ntau dua, vim tias kev sim ntau zaus ua tiav, thiab cov kev ntsuas ntsuas sib txawv. Tam sim no, cov txheej txheem calibration feem ntau muab faib ua ib-point calibration, ob-point calibration, thiab peb-point calibration. Lub sij hawm calibration ntau dua, qhov tseeb dua thiab qhov tseeb dua qhov ntsuas ntsuas acidity.
Thaum calibrating lub ntsuas ua ntej ntsuas, tus qauv buffer tov ze rau pH tus nqi ntawm cov tshuaj ntsuam xyuas yuav tsum tau xaiv. Tom qab lub ntsuas ntsuas tau ntsuas nrog cov txheej txheem tsis haum thaum ntsuas, nws yuav tsum tau kuaj xyuas dua nrog lwm cov txheej txheem tsis sib xws nrog pH sib txawv ntawm li 3, thiab qhov yuam kev yuav tsum tsis pub tshaj ±0.1. Ua ntej hloov cov txheej txheem buffer tov los yog cov tshuaj ntsuam xyuas, cov electrodes ntawm lub acidity meter yuav tsum tau muab ntxuav tag nrho nrog dej, thiab ces cov dej yuav tsum tau nqus, los yog ntxuav nrog cov hloov txheem buffer tov los yog tshuaj ntsuam xyuas.
Txhawm rau calibrate pH sojntsuam, ob qhov kev daws teeb meem tsis txaus. Yog hais tias tus qauv yuav tsum tau kuaj yog acidic, thov calibrate lub sojntsuam nrog tsis muaj kev daws teeb meem nrog pH 4 thiab 7, thiab yog hais tias tus qauv yuav tsum tau kuaj yog alkaline, thov siv buffer tov nrog pH 7 thiab 10 rau calibrate. Cov kev daws teeb meem tsis yog muag raws li cov hmoov granules thiab cov kev daws teeb meem. Granules muaj qhov zoo ntawm lub sijhawm cia ntev thiab kev lag luam, tab sis lawv tsuas yog tsis yooj yim. Cov tshuaj tiav lawm yog ib qho yooj yim mus use, tab sis nws yog ib qho yooj yim mus deteriorate tom qab qhib lub hau. Koj tuaj yeem faib cov tshuaj tiav rau hauv cov beakers me me rau kev siv.
Yog tias koj siv cov hmoov granules, thov ua ib qho tsis nrog 50ml deionized dej ua ntej calibration. Cov kev daws teeb meem tsis zoo yuav tsum tau muab pov tseg tom qab siv rau calibration. Yog li ntawd, cov kev daws teeb meem tsis tiav yuav tsum tau muab faib ua cov pob khoom sib cais rau kev siv. Tsis txhob nchuav cov khoom siv rov qab rau hauv lub raj mis tshuaj.
Thaum ntsuas cov khoom kuaj nrog tus nqi pH siab, yuav tsum tau them nyiaj rau qhov teeb meem ntawm alkali yuam kev, thiab yog tias tsim nyog, siv lub iav electrode haum rau kev ntsuas.
Txhawm rau ntsuas pH tus nqi ntawm cov tshuaj tsis muaj zog nrog lub ntsuas acidity, ua ntej siv cov tshuaj potassium hydrogen phthalate tus qauv tsis haum rau ntsuas qhov ntsuas, tom qab ntawd ntsuas cov tshuaj ntsuam xyuas, thiab coj cov tshuaj ntsuam xyuas dua, kom txog rau thaum nyeem pH tus nqi. tsis hloov hauv 1 feeb. Txog li ±0.05; tom qab ntawd calibrate lub ntsuas nrog borax standard buffer tov, thiab ces ntsuas raws li saum toj no; qhov sib txawv ntawm qhov kev nyeem ntawv ntawm tus nqi pH thib ob yuav tsum tsis pub tshaj 0.1, thiab coj tus nqi nruab nrab ntawm qhov kev nyeem ntawv thib ob raws li nws tus nqi pH. Cov dej uas siv los npaj cov txheej txheem buffer tov thiab yaj cov khoom kuaj yuav tsum tau boiled tshiab txias distilled dej, thiab nws tus nqi pH yuav tsum yog 5.5-7.0. Cov txheej txheem tsis siv tshuaj feem ntau tuaj yeem khaws cia rau 2 mus rau 3 lub hlis, tab sis yog tias nws pom tias muaj turbid, pwm los yog nag lossis daus, nws siv tsis tau ntxiv lawm.
