p-value (acid capacity up to pH 8.2, KS 8.2)
The determination of the p-value is used to measure the acid capacity of water up to a pH value of 8.2 (KS 8.2). This value indicates the amount of acid required to titrate the water to this pH level and thus reflects the concentration of carbonate and bicarbonate ions. It is an important parameter for assessing the buffering capacity and stability of the pH value in technical systems, such as in boiler and cooling water treatment. The analysis is typically carried out using suitable titration methods or test kits, enabling a quick and practical on-site evaluation.
Examples of applications for p-value (acid capacity up to pH 8.2, KS 8.2) measurements include:
- Drinking water treatment – verifying carbonate hardness for taste and corrosion control.
- Aquaculture – ensuring water stability for fish and plant health.
- Swimming pools and spas – controlling alkalinity for balanced water chemistry.
- Industrial process water – protecting equipment and ensuring product quality.
DUROVAL® CPM Test Kit – Quickly Determine Carbonate Hardness & Acid Capacity Set for determining carbonate hardness, p-value, and m-value. The Duroval CPM Test Kit is designed to measure carbonate hardness (m-value; acid capacity up to pH 4.3; Ks 4.3) and p-value (acid capacity up to pH 8.2; Ks 8.2). The kit provides precise results within minutes and enables straightforward analysis. Contents of the DUROVAL® CPM Test Kit Measuring tubes Calibrated dosing pipette 0–20 °dH and 0–7 mmoI/I Special connection stopper Indicators for p-value and m-value 50 ml titration solution Precise determination of carbonate hardness, p-value, and m-value by titration The DUROVAL® CPM Test Kit is a professional analysis set for determining carbonate hardness and water acid capacity. It allows the measurement of p-value (Ks 8.2) and m-value (Ks 4.3), providing essential parameters for the evaluation of raw, process, and operational water. Using the proven titration method, users obtain fast and reliable results in just a few minutes. The kit is ideal for applications in water treatment, industrial processes, and technical operations. Advantages of the DUROVAL® CPM Test Kit for Water Analysis The DUROVAL® CPM Test Kit excels with easy handling and high measurement accuracy. The calibrated dosing pipette ensures precise titration, while the special indicators provide clear and easily visible color changes. The compact kit is ideal for mobile measurements, service operations, and routine checks. It provides a reliable manual solution to quickly assess carbonate hardness and acid capacity and ensures safe control of water chemistry processes. Frequently asked questions How long do Heyl chemicals last? The shelf life is printed on the label of each product. Upon delivery, the guaranteed shelf life is at least 7 months. Can Heyl reagents also be purchased individually? That depends on the specific item to be ordered. For Testoval products, only the complete refill pack can be ordered. The individual small bottles cannot be reordered separately. For the Duroval test kit, the individual components of the refill pack can also be reordered separately. Can the indicator and titration solution be purchased separately? Yes, this is possible for the Duroval product range. Where can I find the safety data sheet? The safety data sheet can be found directly with the product in our shop or separately in the download area under the relevant heading. How can the chemicals be disposed of? Disposal instructions can be found in section 13 of the safety data sheet. Disposal must be carried out in accordance with official regulations. Can the chemicals still be used after the expiry date? No, the chemicals can no longer be used after the expiry date. After the expiry date, accurate measurement results can no longer be guaranteed. How should Heyl chemicals be stored? Section 7 of the safety data sheet contains all relevant information on the storage of chemicals. The recommended storage temperature should be between 15-25°C.