ISO 5815-2:2003 PDF Download

ISO 5815-2:2003 is a standard that outlines a method for determining the biochemical oxygen demand (BOD) of water samples without dilution. This standard is applicable to waters with BOD values equal to or greater than 0.5 mg/l of oxygen, up to a maximum of 6 mg/l of oxygen.

The results obtained from this method are a combination of biochemical and chemical reactions, providing an indication of water quality rather than a definite and precise measurement. It is important to note that certain substances can interfere with the accuracy of the test, including bactericides, toxic metals, free chlorine, and the presence of algae or nitrifying microorganisms. Modifications to the method may be necessary in these situations.

The standard includes three annexes. Annex A provides information on alternative incubation periods for the test. Annex B describes procedures for modifying the method, such as adding seeding material, salts, or allylthiourea (ATU) to inhibit nitrification, as well as neutralization, homogenization, and filtration, which may be needed for specific evaluations of water quality. Annex C provides data on precision.