Piston burette for a burette apparatus

A pre-filled piston burette for both storage and delivery of a reagent, said pre-filled piston burette comprising

• a burette cylinder (11) for storing the reagent and for dispensing the reagent, wherein said burette cylinder (11) is provided with an outlet opening (12) at one end thereof, said burette cylinder has a uniformly constant inner diameter and consists of a plastic material with an oxygen-impermeable barrier layer coated on an interior surface of the plastic material in contact with the reagent, said plastic material consisting of cycloolefin copolymer;
• a predetermined amount of the reagent (17) pre-filled in the burette cylinder;
• removable means for closing the burette cylinder (11) so that the reagent (17) is held in the burette cylinder for the purpose of storing the reagent, said removable means for closing the burette cylinder (11) comprising a removable closing cap (18,23) for closing the outlet opening (12) at the one end of the burette cylinder and a piston (13) slidably mounted in the burette cylinder (11) to close another end of the burette cylinder opposite or remote from the one end closable by the removable closing cap (18);
• means for dispensing a measured portion of the reagent from the burette cylinder, said means for dispensing comprising said piston (13) slidably mounted in the burette cylinder and means for conducting the reagent (17) from the burette cylinder, said means for conducting the reagent (17) comprising a metering tube (19) and a connector (21) for connecting the metering tube (19) with the outlet opening (12) of the burette cylinder when the removable closing cap is not closing the burette cylinder;
• and
• means (15) for releasable attachment of the burette cylinder (11) in a burette apparatus (10), said burette apparatus including a motorized drive (16) and means for connecting the motorized drive (16) to the piston (13) to move the piston (13) in the burette cylinder so as to dispense the reagent, said means (15) for releasable attachment of the burette cylinder (11) being located at said another end of said burette cylinder.