ASTM (American Society for Testing and Materials) has published the new method D8192, which describes the determination of water hardness by automatic photometric titration in domestic and industrial water samples. This new standard method uses a photometric sensor to determine the endpoint of the titration with the highest reliability. Together with a digital titrator, this ensures consistently accurate and reproducible results, even in colored sample matrices. A free whitepaper from Metrohm describes the new method and its application for the determination of water hardness.
ASTM Method D8192 describes the automatic determination of the calcium and magnesium content using a photometric sensor. Here, a digital titrator automatically determines the color change of the titrant with the aid of an optical sensor such as the Metrohm Optrode and thus ensures accurate and reproducible results even with colored samples.