Tom ntej: Aluminium Monostearate CAS 7047-84-9 Assay (Al2O3) 14.5 ~ 16.5%

Aluminium Monostearate
Dihydroxy (stearato) txhuas [7047-84-9].
Aluminium Monostearate yog ib qho kev sib xyaw ntawm txhuas nrog cov khoom sib xyaw ntawm cov organic acids tau los ntawm cov rog, thiab muaj qhov sib txawv ntawm qhov sib txawv ntawm aluminium monostearate thiab aluminium monopalmitate.Nws muaj qhov sib npaug ntawm tsis pub tsawg dua 14.5 feem pua ​​thiab tsis ntau tshaj 16.5 feem pua ​​​​ntawm Al2O3, xam rau ntawm lub hauv paus qhuav.
Ntim thiab khaws cia - Khaws rau hauv cov thawv kaw kom zoo.
Kev txheeb xyuas-
A: Kub 1 g nrog sib tov ntawm 25 mL dej thiab 5 mL ntawm hydrochloric acid rau 1 teev, hloov cov dej raws li nws evaporates: fatty acids yog liberated, floating li oily txheej ntawm cov kua, thiab dej. txheej teb rau cov kev ntsuam xyuas rau Aluminium <191>.
B: Sib tov sib xyaw 25 g nrog 100 mL ntawm ether nyob rau hauv 500-mL hwj, ntxiv 150 mL ntawm 3 N hydrochloric acid, muab ib tug dej-txias condenser, thiab tshav kub ntawm ib chav da dej nyob rau hauv reflux rau 15 feeb.Txias, thiab hloov ob txheej mus rau ib qho kev sib cais nrog kev pab ntawm ib qho ntxiv 100 mL ntawm ether.Co lub zog, thiab cia cov khaubncaws sab nraud povtseg.Tshem tawm cov txheej dej, thiab ntxuav cov ether txheej nrog peb 30-mL dej.Hloov cov ether txheej mus rau ib lub khob me me, sov rau ntawm chav da dej kom txog thaum ether tau evaporated thiab cov fatty acids ntshiab, thiab qhuav cov kua qaub ntawm 105 ° rau 20 feeb: qhov kub thiab txias (saib Cov Roj thiab Cov Roj 401) ntawm cov fatty acids tsis qis dua 54 °.
Poob ntawm ziab <731>-Sry nws ntawm 80 rau 16 teev: nws poob tsis ntau tshaj 2.0% ntawm nws qhov hnyav.
Arsenic, Txoj Kev I <211>-Npaj Kev Npaj Kev Xeem raws li hauv qab no.Rau 3.75 g ntxiv 12.5 mL ntawm hydrochloric acid thiab 0.5 mL ntawm bromine TS, thiab tshav kub ntawm chav da dej kom txog rau thaum lub pob tshab txheej ntawm melted fatty acid cov ntaub ntawv.Ntxiv 50 mL dej, sov rau ntawm lub phaj kub kom txog thaum lub ntim yog li 25 mL, thiab lim thaum kub.Txias, dilute lub filtrate nrog dej mus rau 50 mL, thiab mus rau 10-mL aliquot ntawm cov tshuaj no ntxiv 2.5 mL ntawm hydrochloric acid, ces dilute nrog dej mus rau 55 mL: lub resulting daws raws li qhov yuav tsum tau ntawm kev xeem, ntxiv 20. mL ntawm 7 N sulfuric acid tau teev tseg rau txheej txheem raug tshem tawm.Qhov txwv yog 4 ppm.
Hnyav hlau-Rau 2 g muaj nyob rau hauv 250-mL hwj ntxiv 20 mL dej thiab 10 mL ntawm hydrochloric acid.Muab ib qho me me rau hauv lub caj dab ntawm lub khob, thiab maj mam maj mam hloov cov dej thaum nws evaporates, kom txog rau thaum cov fatty acids cais nyob rau hauv ib tug ntshiab txheej.Txias sai sai los ntawm kev tig hauv qab cov dej txias kom txog thaum cov fatty acids solidify.Tshem tawm los ntawm lub lim yav dhau los ntxuav nrog 3 N hydrochloric acid, ntxuav kom txog thaum sib xyaw ua ke thiab ntxuav ntsuas ntsuas 50 mL, thiab sib tov.Rau 20 mL ntawm pooled filtrate ntxiv 6 N ammonium hydroxide, dropwise, kom txog rau thaum cov ntaub ntawv turbidity mus tas li.Ntxiv 1 N acetic acid kom txog thaum lub precipitate tsuas yaj, ces ntxiv 2 mL tshaj, thiab ntxiv dej kom 40 mL.Ntxiv 1.2 mL ntawm thioacetamide-glycerin puag TS thiab 2 mL ntawm pH 3.5 Acetate Buffer, thiab tso cai rau sawv ntsug rau 5 feeb: cov xim xim av uas tsim los tsis yog tsaus dua li cov tshuaj tswj tau npaj los ntawm 10 mL ntawm cov dej lim dej thiab 2 mL. ntawm Standard Lead Solution (saib Hnyav Hlau <231>) uas muaj 10 µg ntawm txhuas ib mL, ces diluted nrog dej rau 20 mL thiab kho tib yam.Qhov txwv yog 50 µg ib g.
Assay-Yuav tsum hnyav 5 g ntawm Aluminium Monostearate nyob rau hauv lub npog platinum crucible uas yav tas los tau ignited rau 20 feeb, txias tshaj anhydrous magnesium perchlorate, thiab hnyav.Tshav kub qhov qhib crucible maj mam, tsis pub cov qauv tawg mus rau hauv nplaim taws, thiab maj mam nce cua sov kom txog thaum cov tshauv dawb.Ignite cov tshauv rau 20 feeb tom qab cov organic teeb meem raug tshem tawm, thiab txias.Ntxiv 15 mL dej, npog lub crucible nrog ib tug me me saib iav, thiab boil maj mam rau 5 feeb, siv ib tug me me stirring pas nrig kom tawg ib tug loj lumps ntawm tshauv.Decant cov tshuaj los ntawm ashless lim ntawv, khaws feem ntau ntawm cov tshauv nyob rau hauv lub crucible.Rov ua cov extraction nrog dej ob zaug, dhau cov kev daws teeb meem los ntawm tib lub lim.Hloov cov tshauv mus rau lub lim los ntawm kev siv dej zoo, thiab ntxuav lub crucible thiab cov seem peb zaug nrog dej sov.Hloov cov ntawv lim thiab cov seem mus rau lub crucible, qhuav, thiab ignite rau 20 feeb tom qab cov ntawv lim tau hlawv lawm.Tom qab lub sij hawm ignition, npog lub crucible, txias tshaj anhydrous magnesium perchlorate rau 15 feeb, thiab hnyav cov seem ntawm Al2O3 sai.Rov ua qhov hluav taws kub kom txog thaum qhov hnyav tas li, siv 20-feeb ignition lub sij hawm thiab 15-feeb txias lub sij hawm.Los ntawm qhov hnyav ntawm qhov seem seem nyob rau hauv lub crucible, xam cov ntsiab lus ntawm Al2O3.