What is the hold time for all metals testing (except Mercury)?

The hold time for all metals testing, except for mercury, is established at six months. This timeframe is crucial in ensuring that the analytical results are valid and representative of the water sample. During this period, the integrity and stability of the metal constituents in the sample must be maintained, allowing for accurate testing.

This six-month requirement is based on the nature of metal contaminants and how they can change over time due to various environmental factors. By adhering to this hold time, laboratories can ensure that their data is reliable, which is essential for compliance with regulatory standards and for making informed decisions about water quality management.

In contrast, shorter hold times would risk the alteration of the sample characteristics, which could compromise the results. Therefore, understanding and applying the correct hold time is essential for the proper management of water quality testing.