During Procedure B, is a wetting agent added to the wash water on the first rinse?

• A. True
• B. False
• C. Only at the end
• D. Only if the sample is dry

Answer: (A)

The statement that a wetting agent is added to the wash water on the first rinse during Procedure B is correct. The purpose of incorporating a wetting agent is to enhance the cleaning process by reducing the surface tension of the water. This allows the wash water to more effectively penetrate and interact with contaminants or residues on the surfaces being cleaned.

By adding the wetting agent in the first rinse, the procedure ensures that any surfaces or samples are adequately cleaned right from the start, which is crucial for achieving the desired results in any washing or cleaning operation related to the procedure. This step is particularly important in applications where thorough cleaning is necessary to prevent contamination or interference in subsequent processes.

The other options suggest timing or conditions for adding the wetting agent that do not align with the effective cleaning principles laid out in this procedure, which clearly indicates that the wetting agent should be included at the outset of the rinsing process.