What is a composite sample?

A composite sample is defined as a mixture of samples collected over a specific period or from multiple locations. This approach allows for the averaging of results, reducing variability and providing a more representative overview of the system being studied. By aggregating samples, analysts can account for fluctuations in concentration that might occur due to time or location changes, making composite sampling particularly useful in monitoring environmental conditions, effluent discharges, or any other parameters that may vary over time or space.

In contrast, the other options refer to different sampling techniques. A sample collected at a single point in time does not capture variations and is typically known as a grab sample. A sample used specifically for temperature analysis does not inherently describe a composite; it refers to a distinct purpose rather than the nature of sample collection. Similarly, a sample taken from only one location does not encapsulate the concept of being composite, as it does not involve the mixing of samples from multiple points or times.