1. Indlela yokulinganisa izinto eziqinileyo ezimisiweyo: indlela yegravimetric
2. Umgaqo wendlela yokulinganisa
Hlunga isampuli yamanzi kunye ne-membrane yokucoca i-0.45μm, yishiye kwizinto zokucoca kwaye uyomise kwi-103-105 ° C ukuya kubunzima obuqinileyo obuqinileyo, kwaye ufumane umxholo omisiweyo omisiweyo emva kokumisa kwi-103-105 ° C.
3. Ukulungiselela phambi kovavanyo
3.1, I-oveni
3.2 Ibhalansi yohlalutyo
3.3. Isomisi
3.4. I-membrane yokucoca inobukhulu be-pore ye-0.45 μm kunye nobubanzi be-45-60 mm.
3.5, ifaneli yeglasi
3.6. Impompo yokufunxa
3.7 Ibhotile yokulinganisa kunye ne-diameter yangaphakathi ye-30-50 mm
3.8, izitshixo zomlomo osicaba ezingenamazinyo
3.9, amanzi adiyiweyo okanye amanzi obusulungekileyo obulinganayo
4. Amanyathelo ovavanyo
4.1 Faka i-membrane yokucoca kwibhotile yokulinganisa nge-tweezers engenamazinyo, vula i-cap yebhotile, uyifake kwi-oven (103-105 ° C) kwaye uyomise iiyure ezi-2, emva koko uyikhuphe kwaye uyipholise kwiqondo lokushisa kwigumbi. desiccator, kwaye uyilinganise. Phinda ukomisa, ukupholisa, kunye nokulinganisa kude kube nobunzima obuqhubekayo (umahluko phakathi kwemilinganiselo emibini ayikho ngaphezu kwe-0.5mg).
4.2 Vuthulula isampulu yamanzi emva kokususa izinto eziqinileyo ezimisiweyo, linganisa i-100ml yesampulu exutywe kakuhle kwaye uyihluze ngokufunxa. Vumela onke amanzi adlule kwi-membrane yokucoca. Emva koko hlamba kathathu nge-10ml yamanzi adiyiweyo ixesha ngalinye, kwaye uqhubeke nokuhluza ukususa iitrayisi zamanzi. Ukuba isampuli iqulethe ioli, sebenzisa i-10ml ye-petroleum ether ukuhlamba intsalela kabini.
4.3 Emva kokumisa i-filtration yokufunxa, khupha ngokucophelela i-membrane yokucoca elayishwe nge-SS kwaye uyibeke kwibhotile yokulinganisa kunye nobunzima bokuqala obuqhubekayo, uyifake kwi-oven kwaye uyomise kwi-103-105 ° C kwiiyure ze-2, emva koko uyihambise. kwi-desiccator, yiyeke ipholile kwiqondo lokushisa, kwaye ulinganise, ukomisa ngokuphindaphindiweyo, ukupholisa, kunye nokulinganisa kude kube umehluko wesisindo phakathi kwemilinganiselo emibini ≤ 0.4mg. i
5. Bala:
Izinto eziqinileyo ezimisiweyo (mg/L) = [(AB)× 1000× 1000]/V
Kwifomula: A——inqunyanyisiwe eqinileyo + inwebu yesihluzi kunye nobunzima bebhotile (g)
B——Imembrane kunye nobunzima bebhotile (g)
V——umthamo wesampuli yamanzi
6.1 Umda osebenzayo wendlela Le ndlela ifanelekile ukumiselwa kwezinto eziqinileyo ezimisiweyo kumanzi amdaka.
6.2 Ukuchaneka (ukuphindaphinda):
Ukuphindaphinda: Umhlalutyi ofanayo kwiisampuli zebhubhoratri iisampulu ze-7 zomgangatho ofanayo wokuxininisa, kunye nokuphambuka komgangatho ohambelanayo (RSD) weziphumo ezifunyenweyo zisetyenziselwa ukubonisa ukuchaneka; I-RSD≤5% ihlangabezana neemfuno.
Ixesha lokuposa: Aug-15-2023
