What does a spike sample indicate during quality control testing?

A spike sample is used in quality control testing to assess the accuracy and precision of the testing method being employed. By adding a known quantity of a specific contaminant to a sample, analysts can evaluate how well the testing process can detect and quantify that contaminant. The spike sample helps establish a baseline concentration, which serves as a reference point for determining the reliability of the test results.

This baseline concentration is essential for understanding how much of the contaminant is present in both the original sample and the water or air quality being tested. It allows for the accurate interpretation of the actual contamination levels and assists in ensuring that the testing methods are functioning correctly.

Understanding what a spike sample indicates is important for interpreting the results of lead risk assessments accurately, as it ultimately helps in making informed decisions regarding environmental health and safety.