A sample comprising two or more increments selected to represent the material being analyzed is called what?

• A. Grab Sample
• B. Composite Sample
• C. Laboratory Sample
• D. None of the Above

Answer: (B)

Combining two or more increments from the material into one sample is used to obtain a representation of the whole material. By taking multiple portions from different places or times and mixing them, you average out local differences and get a more accurate picture of the overall composition. This is why the described sample is called a composite sample.

A grab sample, by contrast, is just a single increment taken at one spot, which may not capture variability in the material. A laboratory sample refers to a sample prepared for analysis in the lab and doesn’t specify forming it from multiple field increments.