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New and Updated Methods in the ANALYTICA-EBC (January 2016)
Press Release January 2016: New and Updated Methods in the Analytica-EBC
Two new methods, 8.19.1 and 9.37.1, have been issued for the detection and quantification of dissolved oxygen in wort and beer. The methods are, in principle, the same, with the exception that no decarbonation step is required when wort is being measured. This method can be used for the measurement of high levels of dissolved oxygen in wort (10 to 50 mg/litre) or for the detection of low levels of oxygen (10 to 1000 µg/litre) in beer or dilution liquor.
Interference can be caused by compounds such as sulphur dioxide, hydrogen sulphide, chlorine and formaldehyde. The effects of these compounds vary with different sensors and no general rule can be given, except to be aware that interference can occur.
The principle is based on the emission of light by a substance that has absorbed light or other electromagnetic radiation. It is a form of luminescence. In most cases, the emitted light has a longer wavelength, and therefore lower energy, than the absorbed radiation.
In contrast to the polarographic Clark method (electrochemical reaction), which detects a redox reaction of oxygen at the electrode, the optical method is based on an energy transfer between chromophore and oxygen. As advantages, the complete absence of consumables (membranes, calibration solutions, etc.) may be cited. And, equally important, because this technology does not consume oxygen at the sensor-sample interface, no stirring is required in slow or stagnant liquid.
The third method newly edited concerns 9.29 on the measurement of haze. There had been some irregularities and some unclear instructions with the original 9.29. This update has been elaborated in conjunction with Sigrist Photometer, who are the manufacturers of the instrumentation used in this method.
The next meeting of the EBC Analysis Committee will take place on 22 January 2016 upon the kind invitation of the quality department of the Radeberger Gruppe, in Frankfurt/Germany.
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- NEW METHODS -
9.37.1 Dissolved Oxygen in Wort using Optical Sensors
- RENAMED METHODS -
8.19 to 8.19.2
9.37 to 9.37.2
European Brewery Convention: Analytica EBC, 2016
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