Determination of the concentration of active ingredients in alkaline cleaners.
All alkaline cleaning solutions.
Alkaline cleaning solutions, especially for automatic bottle cleaning, consist of sodium hydroxide and so-called active ingredient concentrates. Concentration losses caused by carryover or carbonization can be determined by determining the alkaline component in accordance with
T-740.01.041 Electrolytic conductivity of acidic and alkaline cleaning agents
T-741.02.032 Alkaline cleaning agents - sodium hydroxide only
T-741.03.032 Alkaline cleaning agents containing carbonate - sodium hydroxide and soda
T-741.04.023 Alkaline cleaning agents containing carbonate in the presence of phosphates and soiling - sodium hydroxide and soda
T-741.05.032 Alkaline cleaning agents containing aluminum - sodium hydroxide, aluminum
T-741.06.032 Alkaline cleaning agents containing aluminum - sodium hydroxide, aluminum, soda
can be controlled. However, the active ingredient concentrates are only recorded if it is ensured that the required concentration of the desired active ingredient has been added or dosed using appropriate dosing equipment (proportional dosing). If this is not the case, i.e. if the active ingredient concentrates are prepared and dosed manually, a separate check of the active ingredient concentration is advisable. The determination methods are very different and are specific to a particular active ingredient concentrate*. The method should be requested from the manufacturer.
* e.g. P 3-stabilon; Henkel Hygiene GmbH, D-40554 Düsseldorf, https://www.henkel.de/
Water intended for use as an ingredient in the production of beer (brewing liquor) or other foods
For determination of the dry residue in water after filtration, a certain quantity of filtrate is evaporated until dry. It is subsequently dried in a drying oven to eliminate any remaining moisture.
Water intended for use as an ingredient in the production of beer (brewing liquor) or other foods
Determination of the dry residue (ash content) of a filtered or unfiltered water sample.
The method describes how to determine the nitrate content of water photometrically with a cuvette test.
In an acidic sulfurous solution containing phosphorus, nitrate ions react with 2,6-dimethylphenol to produce 4-nitro-2,6-dimethylphenol.
The method is suitable for determining approx. 0.5–25 mg/l NO3-. If the ratio of chloride to nitrate ions is larger than 10, this may interfere with the reaction (if this is the case, according to DEV D 9-3, follow DIN 38405); likewise, nitrite ions exceeding approx. 0.2 mg/l may also interfere with the reaction. For their removal, refer to Remarks below.
Analysis of the sugar spectrum in all beverages
This method is suitable for all beverages.
Separation by HPLC is based on a combination of reversed-phase, normal-phase, ion-exclusion and ion-exchange chromatography
Quantitative analysis of carbohydrates in wort, beer and other beverages
This method is suitable for wort, beer and other beverages.
The hydrolysis and dehydration of carbohydrates with sulfuric acid results in the formation of 5-hydroxymethylfurfural, which reacts with anthrone to create a blue-green color, measured at 625 nm.