Qhov sib txawv tseem ceeb ntawm formalin thiab paraformaldehyde yog formalin yog cov tshuaj uas muaj paraformaldehyde units, hos paraformaldehyde yog ib hom polymer tsim los ntawm formaldehyde.
Formalin yog cov xim tsis muaj xim ntawm formaldehyde hauv dej, thaum paraformaldehyde yog cov khoom siv polymer uas tuaj yeem categorized li poly-acetal.
Formalin yog dab tsi?
Formalin yog cov xim tsis muaj xim ntawm formaldehyde hauv dej. Nws yog ib qho organic compound uas tshwm sim ib txwm muaj, thiab nws muaj cov tshuaj formula CH2O-(H-CHO). Ntshiab formaldehyde muaj ib tug pungent tsw, thiab nws tsuas yog tshwm sim raws li ib tug tsw tsw xim uas muaj peev xwm undergo polymerization spontaneously, tsim paraformaldehyde.
Formalin tuaj yeem pom hauv peb hom loj: buffered, unbuffered, thiab neutralized forms. Peb pawg no tau muab faib raws li qhov muaj peev xwm buffering ntawm cov kev daws teeb meem no. Peb qib ntawm formalin no tuaj yeem siv rau kev tshawb fawb txog formalin fixatives. Formalin fixatives yog cov tshuaj daws teeb meem uas peb tuaj yeem siv los khaws cov khoom ntawm cov khoom muaj sia xws li tsiaj lossis cov ntaub so ntswg. Feem ntau cov formalin fixative siv nyob rau hauv lub chaw soj nstuam yog buffered formalin fixative.
Daim duab 01: Formalin Siv los khaws cov ntaub so ntswg tsiaj
Buffered formalin yog tus qauv thiab nyiam formalin fixative rau cov ntaub so ntswg preservation. Cov tshuaj no feem ntau yog yuav los ua cov tshuaj npaj. Feem ntau, cov tshuaj buffered formalin no yog npaj los ntawm kev sib tov ib feem ntawm cov khoom formalin nrog cuaj qhov chaw ntawm cov dej distilled. Txhawm rau kom tau txais lub peev xwm buffering, peb tuaj yeem ntxiv cov tshuaj reagents xws li monobasic sodium hypophosphate thiab dibasic lossis anhydrous sodium hyper phosphate.
Unbuffered formalin yog cov tshuaj formalin hauv dej. Cov tshuaj no yog tsim thaum ib feem ntawm formalin tov nrog cuaj qhov chaw ntawm dej. Cov tshuaj sib tov no muaj pH txog 3-4, uas tuaj yeem sib txawv raws li qhov concentration ntawm formalin Tshuag peb siv rau lub hom phiaj no.
Neutralized formalin yog ib qho kev daws teeb meem ntawm formalin hauv dej, muaj tus nqi nruab nrab pH. Yog li, pH ntawm hom tshuaj no yuav tsum yog 7.0. Thaum cov tshuaj formalin tov nrog dej, nws muab cov kua qaub, yog li peb yuav tsum tau kho cov pH siv lub hauv paus xws li sodium hydroxide.
YParaformaldehyde yog dab tsi?
Paraformaldehyde yog cov khoom siv polymer uas tuaj yeem faib ua poly-acetal. Nws yog qhov tsawg tshaj plaws polyoxymethylene compound. Peb tuaj yeem tau txais cov khoom no raws li cov khoom ntawm polymerization ntawm formaldehyde nrog ib tug raug degree ntawm polymerization ntawm 8-100 units. Nws zoo nkaus li crystalline dawb khoom thiab muaj ntxhiab tsw zoo li formaldehyde. Solubility ntawm cov khoom no hauv dej yog tsawg heev.
Daim duab 02: Cov Qauv Tshuaj ntawm Paraformaldehyde
Cov tshuaj no tsim maj mam hauv cov tshuaj aqueous formaldehyde hauv daim ntawv dawb precipitate. Tshwj xeeb, peb yuav tsum khaws cia rau hauv qhov txias kom tau txais cov dej nag no. Hauv qhov sib piv, paraformaldehyde tuaj yeem depolymerized rau formaldehyde roj los ntawm cov txheej txheem cua sov qhuav. Cov pa roj no ua rau muaj hluav taws kub heev.
Tom qab depolymerization, peb tuaj yeem siv cov khoom kawg ua cov tshuaj tua kab mob, tshuaj tua kab mob, fungicide, thiab kho. Yog tias cov saw ntev ntev ntev, peb tuaj yeem siv cov khoom sib xyaw no ua cov khoom siv thermoplastic thiab.
Qhov txawv ntawm Formalin thiab Paraformaldehyde yog dab tsi?
Formalin thiab paraformaldehyde yog cov organic sib txuas. Qhov sib txawv tseem ceeb ntawm formalin thiab paraformaldehyde yog formalin yog cov tshuaj uas muaj paraformaldehyde units, hos paraformaldehyde yog ib hom polymer tsim los ntawm formaldehyde. Ntxiv mus, formalin muaj txiaj ntsig zoo li cov tshuaj tua kab mob, ua cov tshuaj tua kab mob hauv tsev pam tuag thiab chaw kuaj mob, thaum paraformaldehyde tseem ceeb xws li tshuaj tua kab mob, tshuaj tua kab mob, thiab tshuaj tua kab mob.
Hauv qab no yog cov ntsiab lus ntawm qhov sib txawv ntawm formalin thiab paraformaldehyde hauv daim ntawv tabular rau ib sab ntawm kev sib piv.
Summary – Formalin vs Paraformaldehyde
Formalin yog cov xim tsis muaj xim ntawm formaldehyde hauv dej. Paraformaldehyde yog ib qho polymer compound uas tuaj yeem categorized li poly-acetal. Qhov sib txawv tseem ceeb ntawm formalin thiab paraformaldehyde yog formalin yog cov tshuaj uas muaj paraformaldehyde units, hos paraformaldehyde yog ib hom polymer tsim los ntawm formaldehyde. Yog li ntawd, formalin yog ib tug sau ntawm polymeric formaldehyde tshuaj.
