UBUCIKO
UBUHLE NEMPILO
UBUCIKO BEZANDLA
AMASIKO NOMLANDO
EZOKUZIJABULISA
IMVELO
UKUDLA NEZIPHUZO
REVERSE ENGINEERING
IZAYENSI
EZEMIDLALO
UBUCHWEPHESHE
IZINTO EZIGQOKWAYO
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.
Ophakathi
Half an hour per pipette
Imiyalelo
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.
Izinto zokwakha zalesi sinyathelo:
Isethi Yemibhobho Yengilazi1 ucezuAmathuluzi adingekayo:
Isibani sokuphephetha ingilazi sasetafuleni
Isibhoboza Sedayimane
Izibuko zokuphepha
Amagilavu Amelana Nokushisa2
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.
Amathuluzi adingekayo:
Isibani sokuphephetha ingilazi sasetafuleni
Izinsimbi zokuhlikihla (ezesandla)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.
Izinto zokwakha zalesi sinyathelo:
Amanzi0.2 ilithaAmathuluzi adingekayo:
Isikali sesilinganiso
Ibhikha LengilaziIsibhoboza Sedayimane
Irula4
4
Mark spacing
Mark spacing
Ilayisha incwadi ye-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.
Amathuluzi Adingekayo
8- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
- Isibambeli
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