Qhov sib txawv tseem ceeb ntawm polycyclic thiab polynuclear aromatic hydrocarbons yog lub sij hawm polycyclic aromatic hydrocarbon piav txog qhov muaj ob los yog ntau dua cyclic qauv fused rau ib leeg whereas lub sij hawm polynuclear aromatic hydrocarbon piav txog qhov muaj ntau tshaj ib atom.
Cov ntsiab lus polycyclic aromatic hydrocarbons thiab polynuclear aromatic hydrocarbons yog hais txog tib pawg ntawm cov organic tebchaw uas muaj ob peb lub voj voog ntawm cov pa roj carbon thiab hydrogen yog fused nrog ib leeg tsim cov organic molecule loj. Txawm li cas los xij, qhov sib txawv ntawm polycyclic thiab polynuclear aromatic hydrocarbons nyob ntawm cov lus piav qhia los ntawm txhua lub sij hawm; polycyclic hais txog "ntau lub voj voog" thaum polynuclear hais txog "ntau lub atoms".
Dab tsi yog Polycyclic Aromatic Hydrocarbons?
Polycyclic aromatic hydrocarbons yog ib pawg ntawm cov organic tebchaw uas muaj cov organic molecules loj uas muaj ob peb lub voj voog sib xyaw ua ke. Raws li nws lub npe implies, polycyclic aromatic hydrocarbons yog hydrocarbon tebchaw (cov molecules no tsuas muaj cov pa roj carbon thiab hydrogen atoms) uas muaj ntxhiab (muaj planar, unsaturated rings ntawm atoms nrog nce stability vim delocalization ntawm pi electrons) thiab muaj fused aromatic nplhaib qauv. Lub denotation rau cov compounds yog PAH.
PAHs yog cov khoom sib xyaw uas tsis muaj nqi, thiab lawv feem ntau tsis yog polar thiab. Peb tuaj yeem pom cov khoom sib xyaw no hauv cov thee thiab tar deposits. Lub thermal decomposition ntawm cov organic teeb meem tsim polycyclic aromatic hydrocarbons. Qhov yooj yim PAH yog naphthalene. Txawm hais tias benzene yog cov qauv uas muaj ntxhiab tsw qab, peb tsis tuaj yeem xav tias nws yog polycyclic hydrocarbon vim tias nws tsuas muaj ib qho qauv cyclic (PAH muaj ntau dua ib lub qauv cyclic). Feem ntau, cov tebchaw no tsis muaj heteroatoms (atoms uas tsis yog carbon thiab hydrogen). Ntxiv mus, lawv feem ntau tsis nqa cov neeg hloov pauv.
Daim duab 01: Txawv Polycyclic Aromatic Hydrocarbon Compounds
Cov no yog cov tsis muaj polar thiab lipophilic compounds. Txij li lawv yog cov organic thiab muaj ntxhiab, PAHs yog insoluble hauv dej. Txawm li cas los xij, qee qhov sib xyaw tuaj yeem pom tias muaj kab mob hauv cov dej haus. Cov tswv cuab loj ntawm chav kawm no yog insoluble, txawm nyob rau hauv cov organic solvents thiab lipid daws. Ntxiv mus, cov tshuaj no feem ntau tsis muaj xim.
Dab tsi yog Polynuclear Aromatic Hydrocarbons?
Polynuclear aromatic hydrocarbons yog cov tshuaj tsw qab organic uas muaj ntau dua ib lub atom. Cov chav kawm ntawm cov tebchaw no muaj cov tshuaj polycyclic aromatic thiab lwm cov tshuaj tsw qab uas muaj ntau tshaj ib lub atom. Lo lus polynuclear hais txog ntau + nuclei (atomic nuclei).
Daim duab 02: Benzene Structure
Txawm li cas los xij, peb feem ntau siv lo lus no los hu ua polycyclic aromatic hydrocarbon compounds. Tab sis, pawg no kuj muaj benzene vim nws yog ib qho tshuaj tsw qab uas muaj 18 atoms.
Qhov txawv ntawm Polycyclic thiab Polynuclear Aromatic Hydrocarbons yog dab tsi?
Txawm hais tias cov ntsiab lus polycyclic aromatic hydrocarbon thiab polynuclear aromatic hydrocarbon yog hais txog tib pawg ntawm cov tebchaw, ob nqe lus no txhais tau txawv. Qhov sib txawv tseem ceeb ntawm polycyclic thiab polynuclear aromatic hydrocarbons yog tias lub sij hawm polycyclic aromatic hydrocarbons piav txog qhov muaj ob los yog ntau dua cyclic qauv fused rau ib leeg, whereas lub sij hawm polynuclear aromatic hydrocarbons piav txog qhov muaj ntau tshaj ib atom.
Ntxiv mus, cov benzene molecule tsis suav nrog hauv chav kawm ntawm polycyclic aromatic hydrocarbons vim nws tsuas muaj ib lub voj voog nkaus xwb. Txawm li cas los xij, nws suav nrog hauv pawg polynuclear aromatic hydrocarbons. Yog li, qhov no kuj yog qhov sib txawv tseem ceeb ntawm polycyclic thiab polynuclear aromatic hydrocarbons.
Summary – Polycyclic vs Polynuclear Aromatic Hydrocarbons
Txawm hais tias cov ntsiab lus polycyclic aromatic hydrocarbon thiab polynuclear aromatic hydrocarbon yog hais txog tib pawg ntawm cov tebchaw, ob nqe lus no txhais tau txawv. Qhov sib txawv tseem ceeb ntawm polycyclic thiab polynuclear aromatic hydrocarbons yog hais tias lub sij hawm polycyclic aromatic hydrocarbons piav txog qhov muaj ob los yog ntau dua cyclic qauv fused rau ib leeg whereas lub sij hawm polynuclear aromatic hydrocarbons piav txog lub xub ntiag ntawm ntau tshaj ib atom.
