Hanyar aunawa na dakatar da daskararru: Hanyar gravimetric

1. Hanyar aunawa na dakatar da daskararru: Hanyar gravimetric
2. Ƙa'idar hanyar aunawa
Tace samfurin ruwa tare da membrane tace 0.45μm, bar shi a kan kayan tacewa kuma a bushe shi a 103-105 ° C zuwa ma'auni mai mahimmanci, kuma samun abubuwan da aka dakatar da su bayan bushewa a 103-105 ° C.
3. Shiri kafin gwaji
3.1, Tanda
3.2 Ma'aunin nazari
3.3. Mai bushewa
3.4. Membran tacewa yana da girman pore na 0.45 μm da diamita na 45-60 mm.
3.5, gilashin mazurari
3.6. Vacuum famfo
3.7 kwalban auna tare da diamita na ciki na 30-50 mm
3.8, lebur baki mara haƙori
3.9, distilled ruwa ko ruwa daidai da tsarki
4. Matakan tantancewa
4.1 Sanya membrane na tacewa a cikin kwalban aunawa tare da tweezers ba tare da hakora ba, buɗe hular kwalban, motsa shi a cikin tanda (103-105 ° C) sannan a bushe shi tsawon sa'o'i 2, sannan a fitar da shi a kwantar da shi zuwa dakin da zafin jiki a cikin tanda. desiccator, kuma auna shi. Maimaita bushewa, sanyaya, da aunawa har sai nauyi (bambancin tsakanin ma'auni biyu bai wuce 0.5mg ba).
4.2 Girgiza samfurin ruwa bayan cire daskararrun da aka dakatar, auna 100ml na samfurin da aka haɗa da kyau kuma tace shi tare da tsotsa. Bari duk ruwan ya wuce ta cikin membrane tace. Sannan a wanke sau uku da 10ml na ruwa mai tsafta a kowane lokaci, sannan a ci gaba da tacewa don cire alamar ruwa. Idan samfurin ya ƙunshi mai, yi amfani da 10ml na man petroleum ether don wanke ragowar sau biyu.
4.3 Bayan dakatar da tacewa na tsotsa, a hankali cire membrane na tacewa wanda aka ɗora da SS kuma sanya shi a cikin kwalban auna tare da nauyin ma'auni na asali, matsa shi a cikin tanda kuma bushe shi a 103-105 ° C na 2 hours, sannan motsa shi. a cikin na'urar bushewa, bar shi yayi sanyi zuwa dakin da zafin jiki, kuma a auna shi, akai-akai bushewa, sanyaya, da yin awo har sai bambancin nauyi tsakanin ma'auni biyu shine ≤ 0.4mg. da
5. Lissafi:
Daskararrun da aka dakatar (mg/L) = [(AB)× 1000× 1000]/V
A cikin dabara: A——dakatar da ƙarfi + tace membrane da auna nauyin kwalban (g)
B——Membrane da auna nauyin kwalbar (g)
V——ƙarar samfurin ruwa
6.1 Iyakar hanyar da ake amfani da ita Wannan hanyar ta dace da ƙayyadaddun daskararrun da aka dakatar a cikin ruwan sharar gida.
6.2 Daidaitawa (maimaitawa):
Maimaituwa: Manazarta iri ɗaya a cikin samfuran dakin gwaje-gwaje samfuran samfuran 7 na matakin maida hankali iri ɗaya, kuma ana amfani da daidaitattun daidaitattun daidaito (RSD) na sakamakon da aka samu don bayyana daidaito; RSD≤5% ya cika buƙatun.