CWEA Grade 3 Lab Analyst Practice Exam

The amber volatile organic analysis (VOA) bottle is the appropriate choice for sampling 624 volatile organic compounds (VOCs) due to its ability to effectively protect the sample from light exposure, which can cause the degradation of certain organic compounds. The amber color acts as a barrier to ultraviolet (UV) light, ensuring that the chemical integrity of the sample is maintained during transport and storage. Additionally, VOA bottles are specifically designed for the collection and preservation of volatile organic compounds, featuring tight-sealing lids that minimize the risk of vapor loss and contamination. This is essential for accurate analysis, as any change in the sample due to light exposure or evaporation could lead to significant discrepancies in results. Other bottle types, while useful for specific applications, do not provide the same level of protection for VOCs. For instance, sterile plastic bottles may not prevent light from affecting sensitive compounds, clear glass lacks the protective qualities of amber glass, and polyethylene may absorb certain unregulated VOCs or allow for leaching, affecting the sample integrity. Therefore, the amber VOA bottle is the most suitable choice for ensuring the reliability of VOC sample analysis.