Tsis muaj qhov sib txawv ntawm qhov nqus thiab molar absorptivity vim tias ob nqe lus qhia tib lub tswv yim. Absorptivity, los yog molar absorptivity, yog absorbance ntawm kev daws ib chav tsev ntev thiab concentration. Cov molar absorptivity tuaj yeem txiav txim siab thaum siv Beer Lambert Law.
Molar Absorptivity yog dab tsi?
Absorptivity lossis molar absorptivity yog absorbance ntawm cov tshuaj ib chav tsev ntev thiab concentration. Nws pib los ntawm Txoj Cai Beer Lambert. Beer Lambert Txoj Cai hais tias qhov absorbance ntawm electromagnetic nthwv dej los ntawm kev daws yog ncaj qha proportional rau qhov concentration ntawm cov tshuaj thiab qhov kev ncua deb mus los ntawm lub teeb beam. Xa mus rau qhov sib npaug hauv qab no, A α lc
Ntawm no, A yog qhov nqus, l yog txoj kev ntev (qhov deb mus los ntawm lub teeb beam) thaum c yog qhov concentration ntawm cov tshuaj. Tus proportionality tas li yog siv kom tau qhov sib npaug rau absorbance.
Daim duab 01: Beer Lambert Law in a Diagram
Qhov absorbance yog qhov sib piv ntawm lub teeb siv ua ntej (I 0) thiab tom qab (Kuv) nws dhau los ntawm kev daws. Xa mus rau qhov sib npaug hauv qab no,
A=εbc
Ntawm no, ε yog molar absorptivity. Nws tseem hu ua molar absorption coefficient. Chav tsev ntawm molar absorptivity tuaj yeem tau los ntawm qhov sib npaug saum toj no thaum chav tsev ntawm cov concentration yog mol / L (moles ib liter) thiab chav tsev ntawm txoj kab ntev yog cm (cm). Chav tsev ntawm molar absorptivity yog L mol-1 cm-1 (vim lub absorbance yog unit-tsawg). Cov molar absorptivity txiav txim siab npaum li cas cov tshuaj tuaj yeem nqus tau lub teeb ci. Tsis tas li ntawd, cov molar absorptivity nyob ntawm hom tshuaj ntsuam xyuas hauv cov tshuaj.
Summary – Absorptivity vs Molar Absorptivity
Lub sij hawm nqus tau muaj cov ntawv thov hauv ob txoj haujlwm, hauv chemistry thiab hauv physics. Nyob rau hauv chemistry, lub absorptivity thiab molar absorptivity yog tib yam. Yog li ntawd, tsis muaj qhov sib txawv ntawm kev nqus thiab molar absorptivity vim lawv qhia tib lub tswv yim; Nws yog absorbance ntawm kev daws rau ib chav tsev txoj kev ntev thiab concentration.
