Massachusetts Wastewater Practice Exam

Which of the following is a reason for using Teflon containers in wastewater analysis?

1. High cost and durability

2. Non-reactive with samples

3. Easy disposal

4. Long-lasting

The correct answer is: Non-reactive with samples

Using Teflon containers in wastewater analysis is primarily attributed to their non-reactive properties with samples. Teflon, being a fluoropolymer, does not chemically interact with most substances, including corrosive and reactive compounds often found in wastewater samples. This ensures that the integrity of the sample is preserved, providing accurate and reliable analysis results. The other options, while they touch on aspects of container use, do not specifically address the critical factor of maintaining sample integrity through chemical inertness. For example, while Teflon containers may be durable and can have a long lifespan, the key purpose in laboratory analyses is to avoid any chemical reactions that could alter the sample's composition. Thus, the non-reactivity of Teflon is paramount in the context of wastewater analysis.