When collecting a water sample for bacteriological examination, what type of container should be used?

The appropriate container for collecting a water sample intended for bacteriological examination must be capable of preserving the integrity of the sample and preventing contamination. A glass or plastic sterile bottle is optimal in this context because these materials are non-reactive and do not introduce any substances that could affect the bacterial content of the water sample. Additionally, using a sterile container minimizes the risk of introducing external bacteria or other contaminants, which is crucial for accurate testing results.

Sterility is vital in bacteriological testing, as the goal is to analyze the sample for the presence of specific pathogens or indicators of water quality without interference from extraneous microorganisms. Containers like metal cans, non-sterile plastic containers, or paper cups do not provide the necessary sterility and integrity needed for reliable testing outcomes. Therefore, the choice of using a sterile glass or plastic bottle ensures the sample remains uncontaminated, ultimately leading to valid examination results.