Respirable fibers yog cov fibers uas nqus tau rau hauv lub ntsws qis thiab feem ntau tsuas yog cov fibers nrog txoj kab uas hla ntawm <3. … Tsis ntev los no, American Conference of Governmental Industrial Hygienists (ACGIH) tau txhais hais tias respirable fibers muaj ib txoj kab uas hla <3. µm, ntev ≥5 µm, thiab ib tug nam piv ntawm ≥3: 1 (ACGIH 2001).
YYuav ua li cas yog biopersistence?
Biopersistence yog ua haujlwm ntawm solubility ntawm fiber ntau hauv lub ntsws, thiab lub peev xwm ntawm lub ntsws kom tshem cov fiber ntau ntawm lub ntsws.
Cov khoom loj npaum li cas thiaj ua pa tau?
Cov txheej txheem uas ua rau cov pa hauv pa nanometer-diameters, cov pa ua pa nanostructured (feem ntau me dua 4 micrometers) thiab cov tee respirable ntawm nanomaterial suspensions, kev daws teeb meem thiab slurries yog qhov tshwj xeeb rau muaj peev xwm nqus tau pa.
thoracic particulate matter yog dab tsi?
Thoracic thiab respirable feem txhais tau tias yog feem ntawm cov pa nqus pa uas muaj peev xwm hla dhau lub larynx thiab ciliated airways, feem, thaum nqus tau.
Qhov luaj li cas yog plua plav nqus tau?
Lub hom phiaj tshwj xeeb rau cov cuab yeej ua piv txwv cov feem cuam tshuam rau kev ua haujlwm huv lub hom phiaj yog teev nyob rau hauv EN481 (1993) thiab yog raws li kev ua piv txwv ntawm kev faib cov khoom (kwv yees li < 10 µm) nrog rau qhov nruab nrab txoj kab uas hla ntawm 4.3 µm, whilst cov feem ib puag ncig muaj raws liparticle…
