From concentration to decision: how to read a residue analysis report

A concentration on its own is only part of the information. To guide a decision, the result must be interpreted in light of the analyzed matrix, the method, analytical limits and the sample's origin.

Soil, water and food answer different questions

The aqueous phase provides information about compounds present in the water analyzed. Soil extraction measures the fraction recovered by the method used. Food requires its own analysis of the relevant part of the produce. These results are not interchangeable.

Below the limit does not mean absent

The limit of detection and the limit of quantification indicate different capabilities of the method. A result below these values must retain that classification in charts and interpretation, rather than being automatically converted to zero.

Comparisons require consistency

Comparable sampling campaigns record locations, depths, dates, preservation and chain of custody. In adsorbent trials, analytical recovery from the treated matrix must be evaluated to avoid confusing retention with reduced extraction capability.

Background references: Moreira's research, UTFPR, 2026; LABGEO corporate materials and scope of services. Editorial note; it does not assess the regulatory compliance of a specific lot.