Environmental Protection Agency (EPA) Model Lead Based Paint Risk Assessor Practice Test

What is the appropriate size of a centrifuge tube used for lead sampling?

1. 50 mL

2. 200 mL

3. 400 mL

4. 1000 mL

The correct answer is: 400 mL

The appropriate size for a centrifuge tube used in lead sampling is crucial for obtaining accurate and effective results. Typically, a 50 mL centrifuge tube is commonly used for various laboratory procedures, including those related to environmental sampling. The volume allows for sufficient space to handle samples while minimizing the risk of overflow during centrifugation. Using a tube that holds too much liquid, like the 200 mL, 400 mL, or 1000 mL options, can lead to complications in sample processing and can make it challenging to achieve the desired concentration, particularly for lead analysis where precision is key. The larger volumes also increase the weight that the centrifuge must handle, which could affect performance and safety. Therefore, for lead sampling, a 50 mL centrifuge tube provides the balance needed for handling sufficient sample volumes while ensuring ease of use, safety, and accuracy in test results.