Tej teeb meem thiab kev daws teeb meem ntawm pH meter
1 Tib tus qauv, tus nqi pH ntawm ob qhov kev ntsuas tsis zoo ib yam?
Kev hloov pauv hauv qhov kub thiab txias lossis tshuaj lom neeg hauv cov qauv nws tus kheej tuaj yeem ua rau muaj kev hloov pauv hauv pH. Yog li ntawd, sim ua kom qhov kub thiab txias kom tsis txhob muaj tshuaj lom neeg.
2 Tib tus qauv ntsuas ntawm ob lub pH meters tib lub sijhawm, tab sis kev nyeem ntawv tsis sib haum?
Vim muaj qhov sib txawv calibration ntawm ob lub pH meters (xws li calibration ua thaum sib txawv), muaj qhov sib txawv ntawm qhov ntsuas qhov ntsuas. Yog li, pH meter yuav tsum tau ntsuas tib lub sijhawm nrog tib lub sijhawm tsis sib xws, thiab tom qab ntawd ntsuas tib lub sijhawm.
3 Vim li cas qhov kev daws teeb meem tsis tuaj yeem ua rau lub sijhawm siv tau thiab siv tsis tau?
Lub sijhawm siv tau ntawm cov tshuaj tsis yog hais txog lub sijhawm khaws cia hauv lub xeev tsis tau siv. Thaum qhib thiab siv, qhov kev daws teeb meem tsis zoo yuav ua rau tsis zoo vim yog kev ua ntawm ntau yam pwm hauv huab cua.
4 Ntau npaum li cas electrodes yuav tsum tau calibrated?
Qhov zaus ntawm electrode calibration nyob ntawm tej yam kev mob xws li kev siv electrode, kev tu, qauv khoom, thiab ntsuas qhov tseeb. Nws raug nquahu kom calibrate ib hnub ib zaug, thiab qhov ntev tshaj plaws yuav tsum tsis txhob tshaj ib zaug ib lub lim tiam. Thaum hloov cov electrodes los yog tsis siv lub sij hawm ntev, nws yuav tsum tau calibrated ua ntej siv.
5 Yuav ua li cas tswj pH electrode?
Tom qab siv cov electrode rau ib lub sij hawm, yog tias koj pom tias txoj kab nqes qis dua thiab cov lus teb ceev yuav qeeb, koj tuaj yeem sim cov hauv qab no:
① Yog tias cov qauv ntsuas muaj cov protein, cov khoom siv electrode tuaj yeem ntxuav nrog pepsin / hydrochloric acid ntxuav kua.
② Yog tias cov qauv ntsuas yog oily / organic kua, nws tuaj yeem yaug nrog acetone lossis ethanol.
③ Yog tias qhov sib txuas ntawm cov electrode pom tias qias neeg thiab dub, qhov kev sib tshuam tuaj yeem raug ntxuav nrog mercaptan tshuaj ntxuav.
④ Ua kom lub electrode membrane. Txoj kev ua kom dej: tsau hauv cov tshuaj electrode regeneration rau 30 vib nas this, ces tsau hauv 3mol / L KCl tov rau 5 teev.
6 Qhov ntsuas kub ntawm cov qauv yog 10 degree. Lub sijhawm no, lub ntsuas pH puas yog 10 degree lossis 25 degree?
Lub ntsuas acidity qhia pH tus nqi ntawm cov tshuaj ntawm qhov ntsuas kub tam sim no. Yog tias ntsuas ntawm 10 degree, lub 'meter' qhia tus nqi ntawm cov tshuaj ntawm 10 degree. Yog tias tsim nyog kom tau txais pH ntawm 25 degree, qhov ntsuas kub ntawm cov tshuaj yuav tsum tau nce / txo qis rau 25 degree, thiab tom qab ntawd ntsuas ntsuas. Kev them nyiaj kub ntawm pH meter yog hais txog kev them nyiaj rau qhov kub ntawm pH electrode, tab sis nws tsis tuaj yeem them tus nqi pH ntawm qhov kub ntawm 25 degrees.
