Glyoxylic acid yog cov organic acid uas muaj cov ntawv thov tseem ceeb hauv kev tsim khoom thiab kev tshawb fawb hauv chav kuaj.Qhov kev txiav txim siab ntawm oxalic acid cov ntsiab lus hauv nws yog ib qho tseem ceeb analytical txoj hauj lwm, uas tuaj yeem pab peb nkag siab qhov purity thiab zoo ntawm cov qauv.Qhov tsab xov xwm no yuav qhia txog cov txheej txheem thiab cov kauj ruam rau kev txiav txim siab cov ntsiab lus oxalic acid.
1.Titration
Ua ntej, titration tuaj yeem siv tau.Nyob rau hauv txoj kev no, qee qhov qauv ntawm glyoxylic acid yog yaj hauv qhov tsim nyog ntawm cov dej, thiab tom qab ntawd cov tshuaj uas muaj cov ntsiab lus ntawm cov poov tshuaj permanganate yog ntxiv.Potassium permanganate thiab oxalic acid yuav txo qis cov tshuaj tiv thaiv nyob rau hauv acidic tej yam kev mob los tsim cov xim tsis muaj oxidation, thiab cov tshuaj tiv thaiv yog ntau.
Los ntawm kev ntxiv cov tshuaj poov tshuaj permanganate dropwise mus rau cov tshuaj tiv thaiv kom txog thaum kawg ntawm cov tshuaj tiv thaiv, cov tshuaj hloov los ntawm tsaus liab doog mus rau lub teeb liab liab.Lub sij hawm no, lub ntim V1 ntawm poov tshuaj permanganate ntxiv yog kaw. Txij li thaum cov tshuaj tiv thaiv stoichiometric ntawm poov tshuaj permanganate thiab oxalic acid yog molar piv ntawm 1: 5, oxalic acid cov ntsiab lus tuaj yeem suav nrog raws li qhov piv no.
Thib ob, spectrophotometric kuj tuaj yeem siv tau.Hauv txoj kev no, cov qauv yog yaj hauv qhov tsim nyog ntawm cov dej thiab cov reagent uas muaj cov hlau ions ntxiv.Oxalic acid thiab hlau ions yuav tsim cov xim liab qab nyob rau hauv acidic tej yam kev mob, uas absorbs lub kaw ncov yog nyob ib ncig ntawm 510nm.Los ntawm ntsuas lub UV- pom kev nqus cov ntsiab lus ntawm cov kua qaub.
Thaum kawg, kuj tuaj yeem siv colorimetry.Nyob rau hauv txoj kev no, cov qauv yog yaj nyob rau hauv ib tug tsim nyog tus nqi ntawm cov dej, thiab ces ib tug reagent uas muaj ib tug reagent uas muaj peev xwm tsim ib tug xim cov khoom nrog oxalic acid nyob rau hauv alkaline tej yam kev mob yog ntxiv.Los ntawm ntsuas lub absorbance ntawm cov khoom, cov oxalic acid cov ntsiab lus yuav tau indirectly.
Nyob rau hauv luv luv, kev txiav txim siab ntawm oxalic acid cov ntsiab lus nyob rau hauv glyoxylic acid yog ib qho tseem ceeb analytical ua hauj lwm, uas yuav ua kom tiav los ntawm titration, spectrophotometric, colorimetry thiab lwm yam kev. Cov txheej txheem no yog qhov yooj yim, nrawm thiab raug, thiab tseem ceeb heev rau kev tswj xyuas kom zoo thiab kuaj xyuas cov qauv.
