Standard buffer npaj thiab cia
1. pH txheem tshuaj yuav tsum muab cia rau hauv qhov chaw qhuav. Piv txwv li, sib xyaw phosphate pH cov qauv tshuaj yuav raug deliquescence thaum huab cua noo siab. Thaum deliquescence tshwm sim, pH tus qauv tshuaj tsis tuaj yeem siv.
2. Thaum npaj cov txheej txheem pH, cov dej distilled thib ob lossis dej deionized yuav tsum tau siv. Yog hais tias nws yog siv los ntsuas pH nrog ib tug 0.1 qib pH meter, cov dej distilled zoo tib yam siv tau.
3. Thaum npaj cov txheej txheem pH, yuav tsum tau siv lub khob me me los dilute nws kom txo tau cov pH txheej txheem tshuaj adhering rau lub beaker phab ntsa. Cov hnab yas lossis lwm lub thawv rau khaws cia pH tus qauv tshuaj yuav tsum tsis yog tsuas yog muab pov tseg kom huv, tab sis kuj yuav tsum tau yaug ntau zaus nrog dej distilled, thiab tom qab ntawd nchuav rau hauv cov txheej txheem pH npaj kom paub tseeb tias nws raug.
4. Cov txheej txheem kev daws teeb meem feem ntau tuaj yeem khaws cia rau 2-3 hli. Yog tias pom muaj turbidity, pwm, lossis nag lossis daus, nws tsis tuaj yeem siv dua.
Alkaline txheem tshuaj yuav tsum tau muab cia rau hauv lub raj mis polyethylene kaw. Tiv thaiv cov pa roj carbon dioxide los ntawm kev nkag mus rau cov txheej txheem kev daws teeb meem los tsim carbonic acid thiab txo nws cov nqi pH.
Muaj ntau hom pH ntsuas vim qhov sib txawv ntawm cov ntsuas hluav taws xob, thiab lawv cov kauj ruam ua haujlwm txawv. Yog li ntawd, kev ua haujlwm ntawm pH meters yuav tsum tau ua nruj me ntsis raws li lawv cov neeg siv phau ntawv kom raug. Hauv kev ua haujlwm tshwj xeeb, calibration yog ib kauj ruam tseem ceeb hauv kev ua haujlwm ntawm pH meters. Cov ntaub ntawv hauv Table 1 yog qhov ntsuas qhov ntsuas pH nrog qhov tseeb ntawm 0.01 qib thiab dhau qhov ntsuas ntsuas ntsuas, ob qho tib si ua ntej thiab tom qab ntsuas ntsuas, qhia qhov tseem ceeb ntawm calibration.
