Plan a recovery study around the actual method

Define the study boundary

List the residue, surface material, sample collection procedure and extraction conditions. These form a study combination; changing one may change what the resulting evidence represents.

Make assumptions visible

Document how test surfaces relate to production surfaces, how the residue is applied and what drying conditions are represented. Record blanks and the handling of results below the quantification capability.

Connect results to use

Before routine use, decide how recovery information will enter the result calculation or acceptance decision. Keep the rationale available with the method rather than as an isolated spreadsheet. The appropriate treatment needs scientific review; this article supplies no universal correction factor.

RECOMMENDED PRACTICE

This article offers editorial working suggestions. It does not replace the original source, site procedures or a documented scientific assessment.