Determination of the aluminum content in beer
This method is suitable for beer.
The aluminum in beer is measured using the flameless AAS technique; the measurement is performed at 309.3 nm.
Applicable for all (laboratory) worts
The Congress wort is heated in order to inactivate the amylolytic enzymes, and afterwards, yeast is added and the wort is allowed to completely ferment out at a minimum temperature of 20 °C in a fermentation tube (fig. 1). The difference in the extract before and after fermentation is measured in order to calculate the limit of attenuation.
Determination of the maximum amount of extract in the wort and beer
wort, beer
After adding yeast, wort or beer is fermented at a minimum of 20 °C in a fermentation tube. The limit of attenuation is calculated from the difference between the extract content prior to (original gravity) and after fermentation. [1]
Determination of the tin content in beer
This method is suitable for beer.
Tin in beer is measured using the flameless AAS technique. The measurement is performed at 235.5 nm.
Determination of the density of a liquid by means of an oscillating U-tube device
wort, beer, beer-based beverages, non-alcoholic beverages, beverages, liquids
Determining the density with a digital density measuring device is performed by the electric excitation of a measurement cell (oscillating U-tube) filled with the solution to be analyzed. As the solution increases in density (corresponding to an increase in mass at the same volume in the measurement cell), this has an effect on the oscillation period (resonance frequency) in the measurement cell. The density can then be calculated from the oscillation period and from this value, the other quantities, e.g., extract content, can be extrapolated [1, 2, 3].
Determination/calculation of the apparent extract content from the SGA20/20 or the density of a liquid
wort, beer, beer-based beverage, NAB, beverage
Determine the SGA20/20 obtained from pycnometry or the density measured with a precision hydrometer or another device for measuring the density. Using the value from the SGA20/20 measurement or the density from the sugar, alcohol, original gravity and correction table according to GOLDINER/KLEMANN, BLOCK, KÄMPF or a polynomial, determine the apparent extract content of the sample.