What is the hold time for turbidity samples?

The hold time for turbidity samples is critical for ensuring that the measurements are accurate and reliable, reflecting the water quality at the time of sampling. In this context, the correct hold time is 48 hours. This duration is established based on the need to analyze turbidity before significant changes can occur in the sample due to physical or biological processes, such as settling or microbial activity, which might lead to inaccuracies in the turbidity readings. Adhering to the 48-hour hold time helps laboratories maintain the integrity of the sample and produce valid results in accordance with standard protocols and guidelines.