Volatile Organic Compounds (VOC) are commonly tested in groundwater samples. What does VOC stand for?

• A. Variable Organic Contaminants
• B. Volatile Oxygen Content
• C. Vaporized Organic Compounds
• D. Volatile Organic Compounds

Answer: (D)

Volatile Organic Compounds are a category of chemicals that contain carbon and are prone to vaporizing at typical environmental temperatures. In groundwater work, that volatility matters because these compounds can move between water and air, affecting how they are sampled, detected, and controlled. The term itself conveys two key ideas: Volatile, meaning easily vaporized, and Organic, meaning carbon-containing compounds, with Compounds just naming the group. That’s why the correct expansion is Volatile Organic Compounds.

The other terms don’t fit because they either describe something different or use misleading wording. Variable Organic Contaminants isn’t a recognized group in groundwater practice, Volatile Oxygen Content confuses volatility with oxygen chemistry, and Vaporized Organic Compounds describes the process rather than the class of substances.