What is the preservation method for UV254 sampling?

The preservation method for UV254 sampling is best achieved using amber glass containers. This is because UV254 measurements are sensitive to light, particularly UV light, which can degrade certain compounds in the sample if exposed. Amber glass containers effectively block UV light, helping to preserve the integrity of the sample during storage and transport. By preventing light exposure, you minimize the risk of photodegradation or chemical reactions that could skew the results of the UV254 analysis.

The other methods listed do not provide the same level of protection against light exposure. While certain acids or salts may be used for other types of analyses or preservation techniques, they do not directly address the light sensitivity of UV254 readings. Thus, using amber glass is vital to ensuring accurate and reliable sampling for UV254 analysis.