LaMotte DIRECT READING AUTOMATIC BURET ASSEMBLY - Manual (Page 2)

5. To fill the buret with titrating solution, gently squeeze the reagent
bottle, forcing the solution up into the barrel of the buret. Continue
squeezing the bottle until the buret is filled just above the zero line at
the top of the scale. Stop squeezing to release the pressure. The
solution will automatically level at the zero line.
CAUTION:
There is a hole in the bulb at the top of the buret. If too
much pressure is applied when filling the buret, the titrating solution
will be forced up into the bulb and out of the hole.
6. If the buret was completely empty, the air in the arm and valve
dispenser must be displaced by priming with titrant. Release sufficient
titrant to waste to fill the arm and eliminate any air bubbles. Refill to
the zero line.
7. The titration solution is dispensed either by means of a rubber
tube-glass bead assembly or a stopcock.
To use the glass bead dispenser, grasp the rubber tube between thumb
and forefinger at the point where the glass bead is positioned in the
tubing, Apply pressure by squeezing the bead. Best results are
obtained when the bead is grasped and squeezed slightly off its center
rather than directly across its center.
When using a stopcock dispenser, slowly turn the knob to control the
flow of titrant into the test sample. By careful adjustment of the knob,
the flow may be regulated for a steady stream or dropwise addition of
the titrating solution.
8. Mix the sample during the titration by swirling the flask or using a
magnetic stirrer. The titration solution is added to the sample until
the appropriate color changes are observed (as described in the
individual test instructions). After the color change has occurred,
read the test result where the bottom of the meniscus (curved surface)
meets the printed scale on the buret.
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