"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, thiab PPM txhais tau tias ib feem ntawm ib lab. Rau kev daws: uas yog, muaj 1/1000 ml ntawm cov kuab tshuaj nyob rau hauv 1 liter ntawm aqueous tov, ces nws cov concentration yog 1 PPM. Rau cov pa roj: Ib txoj hauv kev los qhia qhov concentration ntawm cov pa phem nyob rau hauv qhov chaw ib puag ncig. Volume concentration qhia: qhov ntim ntawm cov pa phem muaj nyob rau hauv ib lab ntim ntawm huab cua, uas yog, PPM, cov roj concentration ntsuas los ntawm feem ntau cov pa detectors yog ntim concentration (PPM), thiab raws li cov kev cai ntawm peb lub teb chaws, tshwj xeeb tshaj yog lub Environmental Protection Department. , cov roj concentration yuav tsum tau qhia nyob rau hauv units ntawm huab hwm coj concentration, thiab peb lub teb chaws cov qauv thiab specifications kuj qhia nyob rau hauv units ntawm loj concentration. Nws yog tsim los ntawm kev siv qee cov khoom siv hlau oxide semiconductor, thiab ntawm qhov kub thiab txias, hluav taws xob conductivity hloov nrog kev hloov pauv ntawm cov pa roj ambient.
