What is the holding time for a sample to be analyzed for cyanide?

The correct holding time for a sample to be analyzed for cyanide is 14 days. This timeframe is established to ensure the stability of the cyanide compounds in the sample, allowing for accurate analytical results. Holding times are critical in environmental sampling, as they help to maintain the integrity of the sample and prevent degradation or loss of volatile constituents. For cyanide specifically, 14 days is defined to ensure that the sample can still accurately reflect the concentration of cyanide present at the time of collection.

In contrast, shorter or longer holding periods may not guarantee the same level of accuracy, as certain forms of cyanide can degrade over time if not analyzed quickly or if the sample is not preserved properly. This makes the 14-day holding time essential for compliance with environmental regulations and standards.