What must be done to prevent cross-contamination when collecting existing paint samples for analysis?

• A. Reuse gloves between samples.
• B. Wear new disposable gloves for each individual sample taken.
• C. Use old gloves from previous jobs.
• D. Wipe hands on apron.

Answer: (B)

Preventing cross-contamination hinges on keeping a clean barrier between samples. The best practice is to wear new disposable gloves for each individual sample taken, then discard them before handling the next one. This stops paint residues or contaminants from the previous sample from transferring to the next, preserving the integrity of the analysis. Reusing gloves or using gloves from previous jobs can leave residues that skew results, and wiping hands on an apron doesn’t provide a proper barrier and can still contaminate the next sample.