Qhia koj yuav ua li cas kom raug siv thiab tswj koj lub ntsuas pH thaum lub caij ntuj no
Kev siv thiab kev saib xyuas ntawm pH electrode
Cov pH meter electrodes tam sim no siv nyob rau hauv lub chaw soj nstuam yog tag nrho cov khoom electrodes. Lawv qhov zoo yog tias lawv siv tau yooj yim, tsis cuam tshuam los ntawm oxidizing lossis txo cov tshuaj, thiab muaj qhov sib npaug ceev ceev. Thaum siv, tshem tawm tag nrho lub tes tsho roj hmab ntawm cov kua filling chaw nres nkoj ntawm pH meter electrode thiab lub tes tsho roj hmab ntawm qis kawg kom tswj tau qhov sib txawv ntawm qhov sib txawv ntawm cov tshuaj potassium chloride hauv cov electrode. Cov hauv qab no yog cov lus qhia luv luv rau kev siv thiab tu cov electrodes:
1. Thaum tsis siv cov hluav taws xob sib xyaw, nws tuaj yeem ua tiav hauv 3M potassium chloride tov. Tsis txhob siv cov tshuaj detergent lossis lwm cov tshuaj uas nqus dej los ntxuav.
2. Ua ntej siv, xyuas lub teeb ntawm lub hauv ntej ntawm lub iav electrode. Raws li ib txwm muaj, lub electrode yuav tsum pob tshab tsis muaj kab nrib pleb; lub teeb yuav tsum tau ntim nrog tshuaj thiab yuav tsum tsis muaj npuas.
3. Thaum ntsuas cov kev daws teeb meem siab, txo lub sij hawm ntsuas kom ntau li ntau tau thiab ntxuav nws kom zoo tom qab siv los tiv thaiv cov kua ntsuas los ntawm adhering rau electrode thiab paug cov electrode.
4. Tom qab ntxuav cov electrode, tsis txhob so lub iav daim nyias nyias nrog cov ntawv lim, tab sis blot nws qhuav nrog cov ntawv lim kom tsis txhob ua rau lub iav daim nyias nyias, tiv thaiv kev sib kis, thiab cuam tshuam rau kev ntsuas qhov tseeb.
5. Thaum lub sij hawm ntsuas, thov nco ntsoov tias cov nyiaj-nyiaj chloride hauv cov ntaub ntawv siv hluav taws xob ntawm cov electrode yuav tsum tau muab tso rau hauv cov tshuaj chloride tsis nyob rau hauv qhov muag kom tsis txhob dhia ntawm cov lej ntawm lub ntsuas ntsuas. Thaum siv, ceev faj kom co lub electrode maj mam ob peb zaug.
6. Cov electrode tsis tuaj yeem siv rau hauv cov kua qaub, muaj zog alkali lossis lwm yam kev daws teeb meem corrosive.
7. Nws yog nruj me ntsis txwv tsis pub siv nyob rau hauv dehydrating media xws li kiag li ethanol, poov tshuaj dichromate, thiab lwm yam.
Kev npaj thiab khaws cia cov txheej txheem tsis daws teeb meem
1. cov khoom siv pH yuav tsum muab cia rau hauv qhov chaw qhuav. Piv txwv li, sib xyaw phosphate pH cov ntaub ntawv txheej txheem yuav deliquesce thaum huab cua av noo siab. Thaum deliquescence tshwm sim, cov khoom siv pH tsis tuaj yeem siv.
2. Ob chav dej distilled lossis dej deionized yuav tsum tau siv los npaj cov tshuaj pH txheem. Yog tias nws siv rau 0.1 qib pH meter ntsuas, cov dej distilled zoo tib yam tuaj yeem siv tau.
3. Thaum npaj cov txheej txheem pH, siv lub raj mis me me los dilute nws kom txo tau cov pH txheej txheem kev daws teeb meem rau ntawm phab ntsa ntawm lub beaker. Cov hnab yas lossis lwm lub thawv ntim cov khoom siv pH yuav tsum tsis yog tsuas yog nchuav kom huv, tab sis kuj yaug nrog dej distilled ob peb zaug, thiab tom qab ntawd nchuav rau hauv cov txheej txheem pH npaj kom paub meej tias cov txheej txheem pH npaj tau raug.
4. Cov txheej txheem kev daws teeb meem feem ntau tuaj yeem khaws cia rau 2-3 hli. Yog tias pom tias muaj turbid, moldy lossis precipitated, nws yuav siv tsis tau ntxiv.
5. Cov txheej txheem alkaline yuav tsum 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.
