What type of container and preservative is required for oil and grease sample analysis?

For oil and grease sample analysis, a specific type of container and preservative is pivotal to ensure that the integrity of the sample is maintained during storage and transportation. Using glass containers is essential as they are chemically inert and do not leach any substances that could possibly interfere with the analysis.

The use of hydrochloric acid as a preservative is crucial because it aids in acidifying the sample, which helps to stabilize the non-polar compounds like oils and greases. The acidification minimizes the loss of volatile components that might evaporate or degrade otherwise. This combination—glass container with hydrochloric acid—ensures that the sample retains its original characteristics until analysis can be performed.

Other options either suggest inappropriate materials or preservatives that could compromise the sample. For example, using plastic could allow for leaching of chemicals that might affect the analysis results. Similarly, sulfuric acid, distilled water, or no preservative do not provide the necessary stabilization needed for accurate oil and grease analysis.