Cov Residue on Ignition / Sulfated Ash test siv cov txheej txheem los ntsuas cov khoom seem not volatilized los ntawm tus qauv thaum tus qauv yog ignited nyob rau hauv lub xub ntiag ntawm sulfuric acid raws li rau cov txheej txheem tau piav qhia hauv qab no.
Yuav ua li cas rau qhov hluav taws kub?
Tom qab txias, moisten cov seem nrog me me (feem ntau 1 mL) ntawm sulfuric acid, maj mam ua kom sov kom txog thaum cov pa dawb tsis hloov lawm, thiab ignite ntawm 600 ± 50ºCkom txog thaum cov residue yog incinerated kiag li. Xyuas kom meej tias cov nplaim taws tsis raug tsim tawm txhua lub sijhawm thaum lub sijhawm txheej txheem.
Vim li cas peb thiaj siv h2so4 hauv qhov seem ntawm qhov hluav taws kub?
Cov no tau txiav txim siab gravimetrically thiab sib sau ua ke hu ua tshauv, lossis qee zaum hu ua residue ntawm ignition. Rau qee cov ntaub ntawv, sulfuric acid yog ntxiv ua ntej cua sov los pab txhawb kev puas tsuaj ntawm cov organic teeb meem thiab kho qee cov hlau raws li lawv cov sulfate ntsev kom tsis txhob muaj kev kub ntxhov
Kuv yuav txo cov seem hauv kuv qhov hluav taws xob li cas?
Heat, maj mam thaum xub thawj, ntawm qhov kub thiab txias raws li qhov ua tau kom txog thaum cov khoom ua kom huv si, txias, ces tshwj tsis yog txwv tsis pub coj mus rau hauv tus kheej monograph, moisten cov seem nrog ib qho me me (feem ntau 1 ml) ntawm sulfuric acid.
Yuav ua li cas yog tias tus nqi ntawm cov seem uas tau txais dhau qhov txwv tau teev tseg hauv tus kheej daim ntawv?
Tshwj tsis yog tau teev tseg, yog tias cov khoom seem tau txais ntau tshaj qhov txwv tau teev tseg hauv tus kheej monograph, rov ua kom moistening nrog sulfuric acid, cua sov thiab ignition li ua ntej, siv 30-feeb ignition lub sij hawm., txog thaumob qhov sib law liag ntawm qhov seem tsis txawv ntau dua 0.5 mg los yog kom txog thaum…
