Which container is used for oil and grease samples?

• A. Glass bottle
• B. Plastic bottle
• C. Metal can
• D. Paper bag

Answer: (A)

Oil and grease samples need a container that keeps the sample exactly as it is, without adding or losing anything. The main idea here is container compatibility with hydrophobic hydrocarbons. Glass is the best choice because it is chemically inert toward oils and greases and is non-porous, so the sample won’t be absorbed by the walls or react with the container. It also won’t leach organic substances into the sample like some plastics can, and it avoids the potential interactions or contamination you might get with metal surfaces. Paper would simply soak up the oil and contaminate the sample, while plastics can sorb hydrocarbons or release additives into the sample. So, using a glass bottle preserves the integrity of the oil and grease sample throughout collection, storage, and analysis.