Dab tsi yog "PPM" hauv cov cuab yeej siv roj?
"PPM" txhais li cas hauv lub ntsuas roj? PPM "yog qhov ntim piv concentration:"PPM" yog ib txoj hauv kev qhia txog qhov concentration ntawm cov tshuaj, nrog PPM sawv cev rau qhov chaw ib lab.
Rau cov kev daws teeb meem: yog tias muaj 1/1000 milliliter ntawm solute hauv 1 liter ntawm aqueous tov, qhov concentration yog 1 PPM.
Rau cov pa roj: ib txoj hauv kev los sawv cev rau qhov concentration ntawm cov pa phem nyob rau hauv qhov chaw ib puag ncig.
Volume concentration sawv cev txoj kev: Lub ntim ntawm cov pa phem muaj nyob rau hauv ib lab ntim ntawm huab cua, los yog hu ua PPM, yog ntsuas los ntawm feem ntau gas detectors li ntim concentration (PPM). Txawm li cas los xij, raws li Tuam Tshoj txoj cai, tshwj xeeb tshaj yog lub tuam tsev tiv thaiv ib puag ncig, cov roj concentration yuav tsum tau nthuav tawm hauv cov chav nyob ntawm huab hwm coj concentration, thiab peb lub teb chaws cov qauv thiab cov kev qhia tshwj xeeb kuj siv units ntawm huab hwm coj concentration. Nws yog tsim los siv lub hauv paus ntsiab lus uas cov conductivity ntawm ib co hlau oxide semiconductor cov ntaub ntawv hloov nrog cov muaj pes tsawg leeg ntawm ambient gas ntawm ib tug tej yam kub.
Yog tias qhov concentration ntawm qee cov pa roj yog 200 ppm, nws txhais tau hais tias tseem muaj 200 cubic meters ntawm cov roj no hauv 1 lab cov pa. ppm yog ib qho khoom siv feem ntau siv rau cov khoom siv hluav taws xob thiab lub tswb ntsuas roj, feem ntau yog siv rau kev sau npe tsis muaj hluav taws xob thiab cov pa hluav taws xob tawg lossis cov cim ceeb toom (cov pa hluav taws kub thiab tawg tau sau nrog% LEL).
Kev siv cov concentration units (mg / m3) raws li ib tug sawv cev ntawm huab cua pa phem concentration tuaj yeem pab txhawb kev suav ntawm qhov tseeb ntawm cov pa phem. Tab sis qhov zoo concentration yog cuam tshuam rau qhov kub thiab txias, siab thiab ib puag ncig tej yam kev mob ntawm cov pa kuaj pom, thiab nws cov nqi yuav txawv nrog cov kev hloov ntawm qhov kub thiab txias, siab thiab lwm yam ib puag ncig; Thaum ntsuas qhov tseeb, nws yog ib qho tsim nyog yuav tsum ntsuas qhov kub thiab txias atmospheric siab ntawm cov pa. Thaum siv ppm los piav txog cov pa phem concentration, qhov teeb meem no tsis tshwm sim vim yog siv qhov ntim piv.
Cov cuab yeej ntsuas roj feem ntau ntsuas cov roj concentration hauv cov ntsiab lus ntawm ntim concentration (ppm). Raws li Suav cov kev cai, tshwj xeeb tshaj yog lub tuam tsev tiv thaiv ib puag ncig, cov roj concentration yuav tsum tau qhia nyob rau hauv units ntawm huab hwm coj concentration (xws li mg / m3), thiab peb lub teb chaws cov qauv thiab specifications kuj siv units ntawm loj concentration (xws li mg / m3). Dab tsi yog qhov kev sib raug zoo ntawm cov concentration units ntawm ob gases hauv mg / m3 thiab ppm? Yuav ua li cas hloov ntawm lawv?
Kev hloov pauv ntawm cov concentration units ntawm ppm rau mg / m3
mg/m3=M/22.4·ppm·[273/(273+T)]*(Pa/101325)
Hauv cov qauv saum toj no, M - sawv cev rau qhov hnyav molecular ntawm cov pa; PPM - ntsuas qhov ntsuas qhov ntsuas; T - Kub; Pa - Siab.
Nrog rau cov qauv no, peb tuaj yeem yooj yim tau mg / m3 los ntawm ppm lossis suav rov qab.
