Formic Acid kuayog xim tsis muaj xim, pob tshab, thiab corrosive nyob rau hauv tsos, thiab vim hais tias cov formaldehyde muaj yog volatile heev, nws yuav emit ib tug muaj zog pungent tsw tam sim ntawd tom qab qhib lub raj mis. Kuj hu ua formic aldehyde, nws yog qhov yooj yim aldehyde. Feem ntau, nws yog combustible, tsis muaj xim, thiab irritating gas. Soluble hauv dej, cawv, thiab ether. 35 ~ 40 feem pua formaldehyde aqueous tov yog hu ua formalin.
Kev siv cov uas npog ntau yam ntawm ntau yam. Vim formaldehyde tuaj yeem khi nrog cov amino pawg ntawm cov protein thiab coagulate cov protein, nws tuaj yeem siv los ua cov ntaub so ntswg fixative thiab preservative hauv tshuaj. Thaum cov concentration thiab koob tshuaj txaus, tus yam ntxwv no muaj peev xwm ua kom puas tsuaj rau feem ntau cov kab mob, yog li nws feem ntau siv los ua tshuaj tua kab mob.
Ua ntej kev kho mob autopsy, nws yuav tsum tau tsau rau hauv formalin kom zoo khaws cia. Yog tias tsuas yog formalin siv los ua cov tshuaj khaws cia, qhov concentration yog 5 feem pua - 10 feem pua, thiab 15 feem pua ntawm qee qhov tuaj yeem siv. Qhov tshwj xeeb concentration nyob ntawm qhov loj ntawm cov qauv. Hauv txoj ntsiab cai, qhov concentration ntawm ib qho qauv me me yog me me thiab cov qauv loj yog siab. Txawm li cas los xij, feem ntau siv cov tshuaj khaws cia yog kwv yees tib yam li cov tshuaj ruaj khov, feem ntau yog formalin, cawv, glycerol, thiab ntau yam sib xyaw npaj raws li kev faib ua feem ntawm cov tshuaj no. Immersion preservation yog ib txoj hauv kev khaws cia cov qauv los ntawm kev muab cov qauv tso rau hauv ib qho tshuaj tov. Feem ntau, tag nrho cov ntaub ntawv, cov khoom siv anatomical, cov qauv hauv zos, lossis cov kabmob tuaj yeem khaws cia hauv txoj kev no.
Hauv cov tshuaj, cov ntsiab lus ntawm formalin feem ntau yog hais txog formaldehyde aqueous tov nrog ib qho concentration ntawm 35 feem pua lossis ntau dua 37 feem pua. Formalin yog ib qho tshuaj aqueous ntawm formaldehyde thiab cov protein coagulant. Nws txoj kev ua tau zoo yog cuam tshuam rau qhov kub thiab ib puag ncig thaum siv. Thaum cov dej kub yog 23 degree ~ 26 degree, qhov siab tshaj plaws kev nyab xeeb concentration hauv 48 teev yog 56ppm. Feem ntau, nws tsis muaj teeb meem kom nchuav 30ppm thaum siv tiag tiag.
Cov kws kho mob ntseeg tias nws yog cov tshuaj lom neeg mob ntev. Kev raug rau cov tshuaj formalin ntev ntev yuav ua rau cov kab mob ua pa ntev, poj niam cev xeeb tub, cev xeeb tub hauv cev xeeb tub, thiab txawm tias mob qog noj ntshav nasopharyngeal. Ib tug siab concentration ntawm formalin muaj tshuaj lom rau lub paj hlwb, lub cev tsis muaj zog, thiab lub siab.
Ntau qhov kev tshawb fawb tshawb fawb thiab kev sim tsiaj tau ntev tau taw qhia tias qhov ntev ntev ntawm cov tshuaj formalin tuaj yeem ua rau mob qog noj ntshav, uas tau teev tseg tias yog "xav tias muaj carcinogen". Trace formaldehyde metabolizes sai heev nyob rau hauv tib neeg lub cev, thiab nws residue tsis muaj zog. Kwv yees li 35 feem pua ntawm cov metabolism tuaj yeem ua rauformic acid, uas tau tawm hauv cov qauv hauv cov zis, thiab qhov seem 65 feem pua tuaj yeem txuas ntxiv mus rau hauv cov pa roj carbon dioxide thiab dej, Txawm li cas los xij, qhov teeb meem loj tshaj plaws yog tias nws yuav ua rau cov cell degeneration, thiab cov noob hloov pauv ntawm cov kab mob, tib neeg. Cov hlwb raug rho tawm lossis cov hlwb tsiaj yog qhov zoo, thiab qhov ua tau ntawm kev ua rau lom tsis zoo yuav tsis raug txiav tawm.