Volumetric flask
A volumetric flask (measuring flask or graduated flask) is a piece of
Classes
Calibration and toleration standards for volumetric flasks are defined in the following standard specifications and practices: ASTM E288,[1] E542,[2] E694,[3] ISO 1042,[4] and GOST 1770-74.[5] According to these specifications, volumetric flasks come in two different classes. The higher standard flasks (Class A, Class 1, USP or equivalent depending on the country) are made with a more accurately placed graduation mark, and have a unique serial number for traceability. Where this is not required, a lower standard (Class B or equivalent) is used for qualitative or educational work.
Modifications
Volumetric flasks are generally colourless but may be amber-coloured for the handling of light-sensitive compounds such as silver nitrate or vitamin A.
A modification of the volumetric flask exists for dealing with large quantities of solids that are to be transferred into a volumetric vessel for dissolution. Such a flask has a wide mouth and is known as a Kohlrausch volumetric flask. This kind of volumetric flask is commonly used in analysis of the sugar content in sugar beets.
While conventional volumetric flasks have a single mark, industrial volumetric tests in analytical chemistry and food chemistry may employ specialized volumetric flasks with multiple marks to combine several accurately measured volumes.
A highly specialized kind of the volumetric flask is the Le Chatelier flask for use with the volumetric procedure in
See also
References
- ^ ASTM E288 - 10 Standard Specification for Laboratory Glass Volumetric Flasks.
- ^ ASTM E542 - 01(2007) Standard Practice for Calibration of Laboratory Volumetric Apparatus.
- ^ ASTM E694 - 99(2010) Standard Specification for Laboratory Glass Volumetric Apparatus.
- ^ ISO 1042:1998 Laboratory glassware – One-mark volumetric flasks.
- ^ GOST 1770-74 Laboratory volumetric glassware. Cylinders, beakers, measuring flasks, test tubes. General specifications.
- ^ ASTM C188 - 09 Standard Test Method for Density of Hydraulic Cement.
See also
- Hughes, J. C. (Apr 1959), Testing of Glass Volumetric Apparatus, NBS Circular 602. (PDF), Natl. Bur. Stand. (U.S.)
- Houser, J. F. (Aug 1973), Procedures for the Calibration of Volumetric Test Measures, NBSIR 73-287. (PDF), Natl. Bur. Stand. (U.S.)
- Lembeck, J. (Oct 1974), Calibration of Small Volumetric Laboratory Glassware, NBSIR 74-461. (PDF), Natl. Bur. Stand. (U.S.)