Volume measurement is one of the routine tasks in the laboratory. Typical volumetric instruments, such as one-mark and graduated pipettes, burettes, volumetric flasks and cylinders are therefore part of the basic requirement. Volumetric equipment are either calibrated ‘to contain’ (In) or ‘to deliver’ (Ex).
1.1.1. ‘To Contain’:
The contained quantity of liquid corresponds exactly to the capacity indicated on the instrument. However, the delivered quantity differs and is reduced by the residue adhering to the wetted glass surface, (e.g. graduated cylinders and volumetric flasks).
1.1.2. ‘To deliver’
The delivered quantity of liquid corresponds exactly to the capacity indicated on the instrument, as the wetting residue rem aining has already been taken into account, (e.g. graduated and bulb pipettes and burettes). For the laboratory various types of technical glasses with different properties are available. Soda lime glass has good chemical and physical properties suitable for short-term chemical exposure and limited thermal stress. Borosilicate glass has very good chemical and physical properties with very good chemical and thermal resistance.
Contents of the Guide
- General Guidelines for use and general Information on Volumetric
- Care and Use of Volumetric Glassware
- Calibrated Glassware
- Glassware Classifications
- Important Documentation and Guidelines: Governing the design and construction of volumetric glassware
- Calibration of Glassware
- Calibration Test Procedure
- Worked Example