What information must be included when providing samples for laboratory analysis?

When providing samples for laboratory analysis, it is crucial to include the identity of the materials to be analyzed. This information allows the laboratory to understand precisely what substances they are working with, which can significantly influence the analysis methods used and the interpretation of results. Accurate identification of materials ensures that the correct procedures are followed and that the analysis is relevant to the specific materials being tested. It also helps in traceability and in maintaining a comprehensive record of materials for quality assurance purposes.

The other factors such as the type of equipment used in sampling, analysis of previous samples, and the temperature during collection may provide useful context but are not as critically important as identifying the materials themselves. These details might support understanding the conditions under which samples were collected or prior test results, but they do not replace the necessity of clear identification of the sample material. The primary focus should always be on the nature of the materials to ensure that the analysis is accurate and applicable.