Which item is a sterile bag used for bacteriological water sampling?

• A. A composite sample.
• B. A weighted bottle sampler.
• C. A sterile bag used for bacteriological water sampling.
• D. A Bacon Bomb used for collecting liquid samples at different depths.

Answer: (C)

Maintaining sterility is essential in bacteriological water sampling. The container used must be sterile and designed to preserve the sample without introducing any microbes. A sterile bag specifically prepared for bacteriological sampling meets these requirements, providing a clean, sealed option that minimizes contamination and helps keep the sample representative until it reaches the lab.

The other options don’t fit this purpose. A composite sample describes combining multiple sub-samples, not a sterile container. A weighted bottle sampler is a depth-sampling device, useful for collecting from a specific depth but not inherently sterile for bacteriological analysis. A Bacon Bomb, while described as a device for collecting liquid samples at different depths, is not the standard sterile container used for preserving bacteriological integrity.