Which description best fits ex-situ sampling?

• A. Data collected in place
• B. Samples removed for laboratory analysis
• C. Isolation of samples for on-site analysis
• D. Real-time monitoring with sensors

Answer: (B)

Ex-situ sampling means taking samples away from their original location for analysis in a laboratory. That’s exactly what the description “samples removed for laboratory analysis” conveys.

In contrast, data collected in place describes analyzing at the scene (in-situ), while isolation of samples for on-site analysis refers to field or on-site testing, and real-time monitoring with sensors involves continuous measurements at the site rather than transporting samples for lab work.