The method describes how to determine the copper content of water using atomic emission spectrometry.
Water intended for use as an ingredient in the production of beer (brewing liquor) or other foods
Boiler feed water for use in the production of beer and other foods
Copper forms a complex with sodium diethyldithiocarbamate with a maximum absorption at 436 nm.
If the copper content is high, turbidity will result. In such cases, the water sample must be diluted. The method is suitable for water with a copper content up to 1 mg/l. An extraction must be performed in order to determine extremely low concentrations of copper.
This method describes how the protein content in adjuncts is determined.
This method describes how the protein content in adjuncts is determined.
Barley intended for the production of malt is evaluated with regard to pre-germination.
Visible pre-germination is evident at the rootlet and is therefore grounds for rejecting a barley lot. However, after the barley is cleaned and the rootlets are removed, the so-called “hidden pre-germination” can be made visible using the staining methods described below.
Kernels suspected of having pre-germinated are boiled for ½−1 min in a 20 % solution of copper sulfate, allowed to remain for 30 min in the hot solution and are subsequently rinsed with water. The acrospire is stained green, making it clearly visible.
Prior to storage, the moisture content of barley must be determined.
The electrical capacitance of a whole, unground grain sample is measured. The apparatus contains three sensors:
Capacitance
The moisture present in a sample absorbs the electrical energy between the walls of the sample container. The electrical signal or the “capacity” increases with higher moisture contents of the sample and with larger sample sizes.
Oscillating weight balance
The oscillating weight balance measures the frequency to determine the mass.
Temperature correction
The capacitance of the sample rises with the temperature. A Thermistor temperature sensor is built into the sample container. The microprocessor automatically corrects for the moisture content.