What are used in wells, storage tanks, and other containers to sample for various chemicals, including volatile organic compounds?

• A. Dippers
• B. Bacon bombs
• C. The DPD kit
• D. Weighted bottle samplers

Answer: (D)

Collecting representative liquid samples from wells and storage tanks, especially for volatile compounds, requires a sealed, depth-targeted sampling method that minimizes exposure to air and contamination. Weighted bottle samplers fit this need perfectly. They are heavy, sealed bottles attached to a line or tether that you lower to the desired depth. As the bottle fills, it can be sealed at depth or sealed after retrieval, so the sample stays enclosed and protected from air contact and degassing as it’s brought to the surface. This preservation is crucial for VOCs, which readily volatilize and can be lost if the sample is exposed to atmosphere or handled too aggressively. The bottles’ inert materials also help prevent interactions that could alter the sample chemistry.

In contrast, a dipper simply collects a surface grab sample and can introduce air into the liquid, which risks VOC loss and produces a less reliable representation of the deeper or bulk liquid. The DPD kit is a field test for chlorine and related parameters after sampling, not a sampling device itself. Bacon bombs are not standard equipment for routine well or tank sampling of VOCs.