Hydrochloric acid

A volumetric standard solution is a solution containing a precisely known concentration of a substance. The concentration of a volumetric standard solution is determined using a primary standard, which is accurately weighed and dissolved to make a specific volume. Volumetric standard solutions are made using reagent-grade (p.a.) substances as source materials.

The advantages of this over making them yourself are:

• Manufactured and tested using modern manufacturing and analytical methods
• Ready-to-use solutions
• High accuracy for precise analyses
• Application of NIST-certified reference substances for checking
• Connection to standard titrators is possible

Titer details: Many of our standard solutions also provide the corresponding titer details in the specification and on the certificate of analysis, in addition to the amount of substance concentrations. If no information is provided, the maximum percentage deviation of the titre corresponds to the specified range of variation in the concentration of the substance. Example: Amount of substance concentration 0,1 mol/l ±0,2 %
It follows that the titer is 1 ±0,2 %, i.e. 0,998-1,002. We recommend the regular checking of the titer prior to application for opened products.

Determination of adsorbable organic halogen compounds (AOX)

AOX (adsorbable organic halogens, where X = Cl, Br, I) is a sum parameter that describes the amount of organic halogen compounds in substances such as water, soil and sewage sludge. This parameter is used primarily in waste water analysis. The method for calculating AOX levels is set out in DIN EN ISO 9562. The quantity of organically bound halogens in a water sample is measured using either the shaking method or the column method. In the shaking method, the AOX in a sample are bound to activated carbon by shaking. In the column method, the AOX in a sample are bound to activated carbon by the action of flushing the sample through a glass column filled with activated carbon. The quantity of activated carbon, which is defined precisely in each case, is then burned in an oxygen chamber and the hydrogen halide released is measured by means of argentometry. The amount of fluoroorganic compounds present cannot be measured argentometrically.