UBUHANZI
UBWIZA N'UBUZIMA
UBUKORIKORI
UMUCO N'AMATEKA
IMYIDAGADURO
IBIDUKIKIJE
IBIRIBWA N'IBINYOBWA
UBWUBATSI BUSUBIRA INYUMA
UBUMENYI
SIPORO
IKORANABUHANGA
IBYAMBARWA
Glass Pipettes: Tube Drawn to a Tip, Graduated by Weighing Water
A pipette is a straight glass tube drawn to a narrow tip: dip it in, close the top with a finger, and let out just the volume you want. Drawn and left plain it is a simple transfer pipette; marked along its length it is a graduated pipette, and a Mohr pipette starts its marks well above the tip and is read as it drains.
The picture: our diagram of a plain and a graduated (Mohr) pipette.
Hagati
Half an hour per pipette
Amabwiriza
1
1
Draw the tip
Draw the tip
Heat a band of straight, even tube while turning, take it out and pull a short taper, as for a capillary. Cut it at the taper to leave a tip about 1 mm across.
Ibikoresho by'iyi ntambwe:
Agafuka k'imiyoboro y'ikirahure1 igiceIbikoresho bikenewe:
Itara ryo ku meza ryo guhuha ikirahure
Agati ko gushushanya k'idayimani
Amadarubindi y'umutekano
Uturindantoki twihanganira ubushyuhe2
2
Finish both ends
Finish both ends
Fire-polish the tip lightly without closing it, and fire-polish the top so a finger seals it well.
Ibikoresho bikenewe:
Itara ryo ku meza ryo guhuha ikirahure
Amakariso (Ikariso ry'Intoki)3
3
Graduate it (Mohr)
Graduate it (Mohr)
Fill above the top mark, let it drain into a weighed beaker on the balance, stopping each few grams and scratching a line at the level. Keep the first mark well above the tip.
Ibikoresho by'iyi ntambwe:
Amazi0.2 litiroIbikoresho bikenewe:
Umunzani w'ibiro
Igikombe cy'IkirahureAgati ko gushushanya k'idayimani
Umurongo w'ipima4
4
Mark spacing
Mark spacing
Gupakira ikaye ya Jupyter…
5
5
Use
Use
Hold it upright, tip in the liquid but off the bottom; draw liquid up with a bulb (never by mouth), close the top with your forefinger and let it down to the mark.
Ibikoresho bikenewe
8- Umwanya
- Umwanya
- Umwanya
- Umwanya
Iki gishushanyo gikora
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