Kev kho kom raug thiab calibration txoj kev ntawm yaj oxygen meter electrode
Qhov teeb meem calibration ntawm yaj oxygen meter (dissolved oxygen meter electrode) yog ib qho teeb meem uas ntau tus neeg ntsib, tab sis ob peb tuaj yeem daws tau. Lawv txhua tus cia siab rau lawv tus kheej cov kev paub dhau los. Nyob rau hauv tas li ntawd, nws yuav yog ib tug muaj zog cov lus qhia rau kev ua yuam kev. Koj yuav tsum Muaj cov kev taw qhia scientific. * Cov lus qhia feem ntau yog cov lus qhia calibration rau pH meter electrode. Niaj hnub no kuv yuav piav qhia luv luv txog qhov kev ntsuas ntawm cov electrode ntawm cov pa oxygen meter, kom txhua tus neeg yuav tsis tsis meej pem thaum ua haujlwm ntawm lub ntsuas pa oxygen. Kab lus no piav qhia yuav ua li cas calibrate (los yog calibrate) lub yaj oxygen meter electrode thiab kev siv yav tom ntej thiab kev saib xyuas ntawm cov electrode.
1. Calibration method of dissolved oxygen meter: Dissolved oxygen meter feem ntau yuav calibrated nrog cov qauv kua los yog nyob rau ntawm qhov chaw sampling.
(1) Dissolved oxygen meter standard solution calibration method: Standard solution calibration feem ntau siv ob-point calibration, namely xoom-point calibration thiab ncua calibration. Lub xoom point calibration tov siv tau 2% Na2SO3 tov. Qhov ntau yam calibration tov tuaj yeem xaiv raws li qhov ntsuas qhov ntsuas: 4M KCl tov (2mg / L); 50% tshuaj methanol (21.9mg / L).
(2) On-site sampling calibration method of dissolve oxygen meter (Winkler method): Nyob rau hauv qhov tseeb siv cov yaj oxygen meters, txoj kev Winkler feem ntau yog siv rau ntawm qhov chaw calibration ntawm yaj oxygen analyzers. Muaj ob qhov xwm txheej thaum siv cov qauv no: thaum ntsuas ntsuas, ntsuas ntsuas ntsuas yog M1, thiab qhov ntsuas ntsuas ntsuas yog A. Thaum ntsuas ntsuas ntsuas, ntsuas ntsuas ntsuas tseem yog M1. Lub sijhawm no, koj tsuas yog yuav tsum tau kho qhov ntsuas ntsuas kom sib npaug A; Thaum ntsuas ntsuas, ntsuas ntsuas ntsuas yog M1, qhov ntsuas ntsuas ntsuas ntsuas yog A. Thaum ntsuas ntsuas ntsuas ntsuas ntsuas ntsuas ntsuas ntsuas ntsuas M2. Lub sijhawm no, ntsuas ntsuas ntsuas tsis tuaj yeem hloov kho kom sib npaug rau A, tab sis kev nyeem ntawv ntsuas yuav tsum raug kho rau 1MA × M2.
2. Kev siv thiab kev saib xyuas ntawm yaj oxygen meter electrodes
(1) Cov tshuaj yaj yeeb yaj kiab electrode yuav tsum tau ntxuav ib zaug txhua 1 mus rau 2 lub lis piam. Yog tias muaj cov kab mob ntawm lub diaphragm, nws yuav ua rau kev ntsuas yuam kev. Ceev faj tsis txhob ua kom lub diaphragm puas thaum ntxuav. Yaug cov pa oxygen meter electrode hauv dej huv. Yog tias cov av tsis tuaj yeem ntxuav tau, so kom zoo nrog cov ntaub mos muag lossis paj rwb.
(2) Lub xoom taw tes thiab ntau yam ntawm cov pa oxygen meter electrode yuav tsum rov ua dua txhua 2 mus rau 3 lub hlis.
(3) Lub ntsuas pa oxygen electrode yuav tsum tau rov tsim dua kwv yees li ib xyoos ib zaug. Thaum ntsuas qhov ntsuas tsis tuaj yeem hloov kho, cov pa oxygen electrode yuav tsum tau rov tsim dua. Electrode regeneration muaj xws li hloov cov electrolyte sab hauv, hloov lub diaphragm, thiab ntxuav cov nyiaj electrode. Yog tias pom oxidation ntawm cov nyiaj electrode, polish nws nrog cov ntawv xuab zeb zoo.
(4) Yog tias pom cov pa hluav taws xob hauv lub ntsuas hluav taws xob tau pom thaum siv, cov electrolyte yuav tsum tau hloov.
3. Polarization ntawm yaj oxygen electrode. Thaum lub tshuab hluav taws xob siv los yog txuas mus txuas ntxiv rau ntau tshaj 5 mus rau 10 feeb, polarization tshwm sim tom qab nws txuas nrog lub twj paj nruag thiab siv lub zog. Txhawm rau kom sib npaug ntawm cov tshuaj hauv cov electrode, txo qis cov pa oxygen tam sim no thiab ua kom cov electrode ruaj khov. Thaum pib, qhov tam sim no ntawm cov electrode kuj loj heev, txo qis exponentially, thiab mus txog lub xeev ruaj khov tom qab 6 teev. Lub sijhawm no, cov ntaub ntawv tso tawm yuav maj mam txo kom txog thaum ruaj khov. Calibration tuaj yeem ua tau. Cov txheej txheem polarization siv sijhawm 6 teev. Ua ntej, txuas cov electrodes mus rau qhov ntsuas thib ob kom raug thiab tom qab ntawd qhib lub zog ntawm lub ntsuas hluav taws xob. Yog tias lub sijhawm hluav taws xob tawm tsis ntev, lub sijhawm polarization yuav luv dua thiab kev ruaj ntseg yuav nrawm dua.
