What is a composite sampling method?

A composite sampling method involves the collection of multiple samples over a certain period or from various locations to create a single, representative sample for analysis. This technique is particularly useful in water quality monitoring because it helps to account for variability in water quality that may occur due to changes over time, seasonal effects, or varying environmental conditions.

By gathering samples at different times or from different locations and mixing them together, the composite sample can provide a more accurate representation of the overall water quality than a single, one-time sample, which might be influenced by transient conditions or anomalies. This method is especially beneficial when evaluating ongoing processes and the effectiveness of water treatment, as it encompasses a wider range of conditions that may affect the quality of the water being sampled.