Cov kauj ruam thiab cov hau kev mus rau calibrate pheter
1. Kev ntsuas hluav taws xob ntawm PH / acidity meters siv hauv chav kuaj:
Thaum ntsuas ntsuas feem ntau siv hauv xov tooj cua ntev, cov kab nqes yuav tsum tau hloov kho kom tau qhov siab tshaj plaws thiab cov roj hmab ntsaws rau sab qaum kev yuav tsum tau qhib kom ua rau lub qhov me me. Txwv tsis pub, tsis zoo siab yuav tsim tawm thaum lub sijhawm ntsuas hluav taws xob, uas yuav ua rau kev daws teeb meem tsis ua kom tsis txhob ua ion pauv cov ntaub ntawv ntsuas.
Tshem tawm cov hluav taws xob los ntawm cov beaker muaj cov dej distilled thiab siv cov ntawv lim kom nqus tau cov dej uas tseem ua rau muaj hluav taws xob. Tom qab ntawd muab cov hluav taws xob rau hauv lub beaker nrog cov khoom xyaw phosphoric acid, thiab tom qab ntawd kho cov khoom siv los ua qhov ntsuas ntawm lub ntsuas. Tom qab teeb tsa qhov kev siv hluav taws xob, nqa tawm cov electrode los ntawm cov beaker uas muaj cov hluav taws xob phosphoric acid daws, thiab muab tso rau hauv beaker muaj dej distilled. Tos li ntev li 3 feeb kom yaj cov nqe seem ntawm cov mixed phosphoric acid tov.
2. Tom qab, tshem tawm cov hluav taws xob los ntawm cov beaker muaj cov dej distilled thiab siv cov ntawv lim kom nqus tau cov dej uas tseem ua rau muaj hluav taws xob. Tom qab ntawd muab cov electrode rau hauv kev daws teeb meem muaj poov tshuaj hydrogen phthalate lossis borax, thiab saib seb cov ntsuas puas qhia tias yog hom ph ntawm 4. {}} Lossis 9.18. Yog tias tsis yog, kho cov kab nqes nqes ntawm lub twj paj nruag los tso tawm lub ph ntawm 4. {}} Lossis 9.18, uas yog ib feem ntau siv ob txhais tes calibration. Yog tias peb-point calibration yog qhov yuav tsum tau, tsuas yog rov ua tib cov kauj ruam rau lwm cov kev daws teeb meem. Nov yog txoj kev ntsuas hluav taws xob rau acidity meters.
3. Tom qab calibration, ntxig roj hmab nres tsheb rov qab. Yog tias tsis siv hauv ib ntus, nco ntsoov sau cov npog tiv thaiv ntawm electrode nrog cov tshuaj noo los ua kom cov electrode. Qhov no tuaj yeem txuas ntxiv lub neej ntawm electrode thiab txo nws lub peev xwm asymmetric. Cov hluav taws xob muaj lub neej thiab tsis yooj yim, yog li lub chaw soj nab yuav tsum tau hloov lawv ntau zaus. Tsis txhob xav tias tsuas yog vim tias cov electrodes tsis puas thaum siv lub sijhawm siv, lawv yuav tsis raug hloov.
4. Ua ntej siv cov composite electrode, thawj zaug kuaj seb puas muaj cov kab nrib pleb lossis tawg rau hauv lub khob muag. Yog tias tsis yog, ua ob-point calibration nrog pH cov tshuaj fffer. Thaum txoj kev muab tso rau thiab txoj kab nqes thiab kab nqes tuaj yeem hloov kho rau tus nqi pawj coj, nws yog feem ntau suav tias yog siv tau. Txwv tsis pub, ua raws cov lus qhia rau kev kho mob electrode kev kho mob. Txoj kev ua kom muaj zog yog rau hauv 4% hydrogen fluoride daws rau txog li {}}}}}} thiab yaug kom huv si nrog dej distilled; Tom qab ntawd soak nyob rau hauv ib 0. 1 mol / l pot acid daws teeb meem rau ob peb teev, yaug nrog dej distilled, thiab ua kom muaj calibration. Rau tsis muab cov hluav taws xob composite, yog tias cov kev daws teeb meem sab hauv yog tsawg dua 1/3, ib qho kev daws teeb meem sab nraud ntawm 3Mol / L Pa kua mob sab nraud yuav tsum tau ntxiv. Yog tias cov poov tshuaj fluoride ntau dua txoj haujlwm ntawm lub qhov me me, pov tseg cov tshuaj potassium fluoride ntau dua thiab kos yog tias muaj npuas hauv qhov kev daws teeb meem. Yog tias muaj npuas, maj mam coj mus rhaub cov electrode kom tiav lawv kom tsis txhob ntsuas cov ntaub ntawv tsis raug.
5. Kev ntsuas hluav taws xob rau mem nplai:
Raus cov kev ntsuam xyuas tus cwj mem electrode rau hauv cov qauv phosphote sib xyaw ua ke nrog tus nqi PH nrog 6.} (Ntawm 25 degree) thiab maj mam muab co nws; Kho lub ntsuas phoo ntsuas hluav taws xob nrog lub hau ntswj me me kom txog thaum pom cov nqi sam thiaj sib phim ntawm qhov ntsuas kub ntawm qhov chaw kub; Ntxig cov electrode rau hauv cov qauv kev daws teeb meem ntawm cov poov tshuaj hydrogen phthalate ntawm PHH 4.01 lossis Borax ntawm Ph 9.18; Tus nqi tso tawm pom yuav tsum nyob hauv cov kev tsis pub dhau ntawm kev ua yuam kev piv rau tus nqi ntawm tus nqi ntawm tus nqi.
