Indlela yokulinganisa yezinto eziqinile ezimisiwe: indlela ye-gravimetric

1. Indlela yokulinganisa yezinto eziqinile ezimisiwe: indlela ye-gravimetric
2. Umgomo wendlela yokulinganisa
Hlunga isampula lamanzi nge-membrane yesihlungi engu-0.45μm, uyishiye endaweni yokuhlunga bese uyomisa ku-103-105°C ukuze ibe nesisindo esingashintshi, futhi uthole okuqukethwe okuqinile okumisiwe ngemva kokoma ku-103-105°C.
3. Ukulungiselela ngaphambi kokuhlolwa
3.1, Ihhavini
3.2 Ibhalansi yokuhlaziya
3.3.Isomisi
3.4.I-membrane yesihlungi inosayizi we-pore ongu-0.45 μm nobubanzi obungu-45-60 mm.
3.5, ifaneli yengilazi
3.6.Iphampu ye-vacuum
3.7 Ibhodlela lokukala elinobubanzi obungaphakathi obungu-30-50 mm
3.8, ama-tweezers angenamazinyo ayisicaba
3.9, amanzi acwengekile noma amanzi ahlanzekile alinganayo
4. Izinyathelo zokuhlola
4.1 Faka i-membrane yesihlungi ebhodleleni lesisindo esinama-tweezers angenamazinyo, vula ikepisi yebhodlela, uyifake kuhhavini (103-105°C) bese uyomisa amahora amabili, bese uyikhipha bese uyipholisa ekamelweni lokushisa ekamelweni. desiccator, futhi uyikale.Phinda ukomisa, ukupholisa, kanye nesisindo kuze kube nesisindo esiqhubekayo (umehluko phakathi kwezisindo ezimbili awukho ngaphezu kwe-0.5mg).
4.2 Shake isampula lamanzi ngemva kokukhipha okuqinile okumisiwe, linganisa u-100ml wesampula exutshwe kahle bese uwahlunga ngokumunca.Vumela wonke amanzi adlule kulwelwesi lwesihlungi.Bese ugeza kathathu ngo-10ml wamanzi acwengekile isikhathi ngasinye, futhi uqhubeke nokumunca ukuze ususe imikhondo yamanzi.Uma isampula liqukethe uwoyela, sebenzisa u-10ml we-petroleum ether ukuze ugeze insalela kabili.
4.3 Ngemva kokumisa ukuhlungwa kokumunca, khipha ngokucophelela ulwelwesi lwesihlungi olulayishwe i-SS bese ulufaka ebhodleleni lokukala elinesisindo esingaguquki sokuqala, ulifake kuhhavini bese ulomisa ku-103-105 ° C amahora angu-2, bese uyalihambisa. ibe i-desiccator, ivumele ipholile ekamelweni lokushisa, futhi ikale , ukomisa ngokuphindaphindiwe, ukupholisa, nokukala kuze kube yilapho umehluko wesisindo phakathi kwezilinganiso ezimbili ungu-≤ 0.4mg.i
5. Bala:
Okuqinile okumisiwe (mg/L) = [(AB)× 1000× 1000]/V
Efomini: A——ulwelwesi oluqinile olumisiwe + olumisiwe kanye nesisindo sebhodlela lesisindo (g)
B——I-Membrane nesisindo sebhodlela lesisindo (g)
V——ivolumu yesampula yamanzi
6.1 Ububanzi obusebenzayo bendlela Le ndlela ifanele ukunqunywa kwezinto eziqinile ezimisiwe emanzini angcolile.
6.2 Ukunemba (ukuphindaphinda):
Ukuphindaphinda: Umhlaziyi ofanayo kumasampula elabhorethri amasampuli angu-7 wezinga lokuhlushwa elifanayo, kanye nokuchezuka okujwayelekile okuhlobene (RSD) kwemiphumela etholiwe kusetshenziselwa ukuveza ukunemba;I-RSD≤5% ihlangabezana nezidingo.